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Vintage Australian Outboard Runabouts => Information Wanted => Topic started by: antman on December 15, 2018, 12:34:01 PM



Title: mercury 650ss 1967 4 cyl
Post by: antman on December 15, 2018, 12:34:01 PM
Hi im Ant
thanks for your exellent forum
ive been googling nd tinkering for 6 months on my problem
I aquired a 14.5 fibreglass runabiut with a 650 ss engine
the engine started ,but hadnt been used for 18 months and little use before that 
on its first run on the bay it  only reved to estimated 2500 rpm (tacho not working ) and could not get the hull planning
off to mechanic ,, was told dizzy not advancing .. get new dizzy
back in the shead  , after amber thinking liquid ....grease nipples
test on bay ..... yep fixed plaining ..going hard and fast !  ;D
10 min later it dies  >:( restarts .then dies  row home
weeks of tinkering i book in to another mechanic
i was told ..the timming is way out    need a new dizzy
took it home and pulled bits off to investigate
= the rotor is at lead 1
=the pully arrow on the top ofthe dizzy assembley is alligned with the rotor
=the arrow mates up perfectly with the 2 dots on the fly wheel
=teh number 1 piston is at the BOTTOM of the stroke ( number 2 piston is at tdc)
what he ? whats happened here ?
so i move all the leads around ..hence engine timming is 180 deg out
and the thing starts 
took to water ..idled out then stopped
returned to garage and checked it out again
now everything is  reversed again back 180 deg ! i put leads back  .but now wont start ... timming is good leads right got spark gotfuel ???
1  how can this happen
i after 1 month of thinking and wraking peoples heads and googling have deduted thet the flywheel must be moving
but then i think the timming marks would move
but if the pulley thet drives the dizzy is fixed to the flywheel then  the timming marks would be correct .
but if the pulley is on the crankshaft ... it would have to move and be out
i so confused ..its been 9 months of crash coarse 2 stroke outboard learning






Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on December 18, 2018, 06:32:05 AM
Wow, your head must be spinning. (unlike your motor)

If I was there, I'd be removing the flywheel to check the key hasn't been sheared. Perhaps someone has removed the key just for a joke? I've honestly discovered that before! That will throw the timing out the window.
Then I'd check the condition of the underside of the flywheel and make sure nothing is loose or broken.

By the way, has the motor been coughing or sneezing at all? Is fuel spitting out of a carbie perhaps?

Keep us posted, this won't be too hard (said the actress to the bishop)

AA are you there? I'm coughing and sneezing at the moment with a summer cold. Do you think I may have a loose/broken or damaged Reed or perhaps a timing problem?

 
MERCMAN.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on December 18, 2018, 06:43:57 PM
thanks Mercman ill check it out ..and post the results


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on December 24, 2018, 11:48:18 AM
confirmed broken key on flywheel  pulley connected to flywheel which explaines everything to do with timing marks not being out  now hunting for woodroff key
 by the way can anybody identify this hull ..


Title: Re: mercury 650ss 1967 4 cyl
Post by: andrewallan on December 26, 2018, 01:58:09 PM
Welcome Antman, and seasons greetings to you all. Sad when 2 paid mechanics haven’t resolved your problem!

Mercman, I have no idea about loose or broken reeds! I was firmly told by Mark S last year NOT to remove the cowl on my engine! Am off down to the beach tomorrow for 10 days, and might get the “trusty” Hartley in the water, dependent on the number of nimwits using the boat ramp, and the length of the queues to said boat ramp! If not, then will get some water time after January. still some anxiety about boating, as she ran really well for the first 3/4 of. The last trip, and really badly for the last bit!

A


Title: Re: mercury 650ss 1967 4 cyl
Post by: senojn on December 26, 2018, 06:21:45 PM
Hi A
Nice to hear from you . You do love your boating so I trust February will be kind to you although my logic suggests the 1st quarter will start as the last quarter finished  ;)
I still admire my girl sitting in the back yard as we also find ramps difficult in our 70's.

Hope you have recovered Merman as you are now back in the fast lane .
Chicago deserves a lot of time with it's testosterone atmosphere and the magnificent buildings including the 'Smithsonians '
Nautically  (to stay with the 'board ' I remember posting photos of the Chicago river and the lock which allows accesses to Lake Michigan .
Happy New Year to all .
Neil


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on December 29, 2018, 10:35:27 AM
Antman,
Congrats' on finding your obvious problem.  ;D . The replacement Crankshaft Key you are looking for, can be easily found at you local outboard wrecker. Ther are that typical with many model's its not funny.
As for the hull, that particular pic makes me say: Swiftcraft Falcon, perhaps.

Is that your motor you have been posting about? You said yours was a 650SS.
The cowls in the pic tells me they are 1973/4 Cowls. There was no SS in those two years. The 650SS was only manufactured in 1967 & 68.

If that is your motor, please provide more pics and I'll happily identify what is going on here for you.

MERCMAN.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on December 29, 2018, 07:10:54 PM
Hi mercman .sn 2287548
has blu band but red 650 ss under that sticker
i think its at 50 years old its got bits of anything compatible
have put back together .found  a woodroff key ..pack 110 assorted
found 3x6.5x16 did the trick ( have ordered 2 x originals from states )
 cleaned up the surfaces with  valve grinding compound  cranked the nut to 75ft pounds torque and
relocating the belt back onto the gear on the flywheel was the hardest part
set the dizzy arrow to the flywheel timing mark .droped on the belt to the dizzy gear
turned it over a few times and it started and idles nicely
has throlle when given the diizy a tweet with linkege disconnected ....
will give it a crack
(trying to post pic s

 


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on December 29, 2018, 07:16:23 PM
65 hp


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on December 29, 2018, 07:20:07 PM
 dizzy and ignition (type 3 ?)


Title: Re: mercury 650ss 1967 4 cyl
Post by: Mark S on January 04, 2019, 12:22:03 PM
Happy new year to everyone on The Board.

Looks like the Dealer trick from the old days of making an outboard look like a later model. Also the engine block is painted black but should be silver. May have had a new Mercury power head fitted when it had the "blueband" makeover?

Black painted blocks didn't appear until the Blueband series. As the 4 cyl 65's  were phased out when the blue bands arrived, none would have had black blocks in their original format.

Mark S.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on January 04, 2019, 04:34:20 PM
Thanks Mark
for its age its definatly had doner .parts
recieved the flywheel keys in the post ..they match the key i used exept for a slight flat on the back
they are basically the same .
tested on the water and running .fixed the key/ timing issue all good
starts well idols well . but back to the original problem of no top end
have pulled out jets and inlet s
cleaned and tested all leads and distributer cap  had a bad connection on lead 4
lubed greese nipples on the dizzy again
will try again ...


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on January 07, 2019, 01:27:24 PM
well it works- but im back to square 1
starts well idols well revs to 4800 at pier
but only 1800 under load
removed the plugs at home ..black ..its running rich
but that could be that at wide open throttle alot of fuel is going in  at 1800 rpm they are fouling up
my hunt for the solution continues
more research ..
ive never checked compression but the past mechanic said good comp and good spark!
rectifier is good .maybe stator not enough power under load for hot sparks maybe
now i am definatly starting to nuts

 


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on January 09, 2019, 05:46:33 PM
Are all plugs fouling equally?
Are any plug leads grounding out? Check for this at night time is best.
Have the plug leads been replaced by silicone? Should be good old copper on a '67 model, I reckon.  :-\
Is an ill fitting plug boot preventing a good contact between the spring and the plug top?
Pull back all plug boots and examine all connections.
Is belt out by one tooth?
Was timing conducted at WOT? Mark, am I right here, I don't have my factory service manual with justme right now.
Re-check compression. Never trust hearsay.

MERCMAN.




Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on January 15, 2019, 08:26:06 PM
Thanks Mercman
cranked the outboard at night . no leakage
when i cleaned the dizzy i checked all conections at the boot and spring sparkplug end  ..yes copper wire
sanded all contacts and springs and rotor and dizzy to remove any bad connection .corrosion
checked for continuity with a tester ..cranked engine with a spark tester and all good sparks
checked tooth on wheel and belt .. arrow and timing dots line up like a straight edge was used
dropped it back a tooth  .. starts  idles .. timing mark on flash on cylinder 1 is right on .......no 4 and line cast in top of castingPhoto i hope )
sticker could be wrong.....when arrow and marks line up ...idling on 800 rpm its timing at 4 - 6 deg on sticker marks
seems to be like they say in the manuals
any way  tes you are correct again Mercman ...no 4 plug is cleaner than the rest
has signs thats its been fireing but its not as oily and fuelie as the others  yet its getting good spark
surface disgarge plugs ..inner coil is black yet the outside circle is clean ..the other 3 are burnt black
i laugh as i know that im now moving to another part of the engine arnt i ...
lack off fuel getting into cylinder 4 ... even though i cleaned the carbies ?..
Compression  ...ill check 



Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on January 16, 2019, 04:15:37 PM
That is the incorrect sticker for a '67 model, if in fact that's what block you have??
That sticker belongs to a 73 model, which match your outer cowls. Grrr.
Where are you located? I think you have a Frankenmerc? I hate them.

As for number 4, I suspect spark, not fuel.
The bottom Carbie fuels both 3 & 4. Even a crook/bent reed would prevent 4 from receiving fuel.

Leave plug in 4 and place a grounded (spare) plug on number 4 lead. Start motor and check spark for strength.
Never start motor without pug in hole. Its starves piston, crank etc of oil, plus it will start a small fire at the back of the motor. Not a good look!
Marshmallows!


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on January 22, 2019, 01:37:00 PM
THanks Mercman
done that .....blue spark constant on plug lead 4
plug firing
sunny bayside  moorabbin
didnt get to water on weekend . will try asap
its not over till its over



Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on January 23, 2019, 02:05:40 PM
One of our members AaronJ had a collection of 4 (I recall) of short shaft 650's. Perhaps he may still own a goer which he is prepared to part with? Send him a PM.
If need be, I can email you his phone number.

MERCMAN.  


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on February 03, 2019, 03:20:20 PM
thanks for that reply Mercman
been a week or two now .  sorry
ive done this and that   done some more research
yep its a frankenstien ....so its just guess work
it could have a 50 hp powerhead on it ..so putting plugs for a 65 say l17v may not be right as the 70s model runs a l77v plug
the timming for a 1969 650 is different from a 1972 model
mine seems to be made up of parts from 67 - 73 so its trickyim across the road from the guy i bought it off . he said it had rings and a new top where the plugs go in  done about 4-6 years ago buy someone out of town
hence why its got good compression
as i said ..it starts idols revs  but only to 2 2000 rpm underload.after injecting copious amounts of carbie cleaner down carb 2 my forth plug seems to be getting fuel oil .as is wetter than before and i used a different plug so i think we are on all 4 cyliners.
so this brings me to the prop . i have the original as a spare buts its stuffed ,has the numbers on it  mercury original 13and ? x 15 pitch
found tables with prop sizes and pitches for  65 hp from that era
i cant tell what ive got on as i cant find any id numbers ..
i should have a 13 .5 x 15 lets say .. different prop pitch and size for d``ifferent revs of the same engine 
it says that a 13 will rev to 4800-5200- but a 14 with some ?inch pitch ..which is designed to push a houseboat will rev to 2800 but have heaps of push
so maybe ive got a bloody houseboat prop and nothing is wrong with my unit!
so i stopped at a mercury parts shop and enquired about buy a correct prop  for $200-300 willing to give it a crack
and the guy says "reckon your wasting your money .youve got other issues and didnt even offer me a prop ...
so i have finally decided to give it away . i give in . i cant afford to buy anew 60  at 8 grand ,but i dont want to buy somebody elses second hand 20 year old piece of ??? that they want half the original price for out of gumtree or ebay ..ive learnt my lesson
just because it starts and runs doesnt mean its a good outboard
a friend of a friend ended up being a mercury outboard expert . he loaned me the flywheel remover and a compression tester small enough to get to no 4 plug
 comp is good all 4 around 120 psi  and even 
anyway stuck with a no go boat ..thinking of giving back to the guy i bought it off ($1000.00) and and telling him to keep his money and have his boat as im over it  luckely it was more time than money spent  :D :D :D
lessons learnt 


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on February 04, 2019, 06:19:31 AM
Not only could the prop be a factor, you may have a gearbox with the incorrect ratio based on what ever powerhead you have.
Sent us a pic of the gearbox plus the midsection and shockers (if any). These pics will assist me in figuring out the possibilities.

This is a good quiz!

MERCMAN.


Title: Re: mercury 650ss 1967 4 cyl
Post by: austral on February 07, 2019, 06:54:12 AM
Are you 100% sure you are getting full throttle ? The fact its been swapped and changed, it may not be adjusted right.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on February 10, 2019, 12:05:56 PM
made a tank


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on February 10, 2019, 12:44:02 PM
Hi . great thinking and good theory s
but being the fact that i have video of this engine wot and up on a plane ,3 minutes before it stopped
it coughed a bit ran a bit and coughed and died .  which we have found out to be the flywheel spinning and shearing the key. no start again
and i dont think it sheared the key due to a sudden lock up stop !i died slowly so i asume it was due to incorrect torque setting on flywheel nut .not tight enough
and the guy i bought it off ran it in this configuration before me . with this prop ...he did admit that i didnt go as hrd as it did after i tinkered and lubed the dizzy magnito thing ( 1 st post )
so ill push reset ( wish there was one ).and go back to the start .chapter 1 page 1 and with a fresh head
 check voltages . sparks . can now check timing in gear at idle  ( im suspecting timing still  rememering 2 mechanics have both suspected timimg )
i l do a link and sink  checking that
mercaman thanks for your input ..
im working on a 4-6 deg atdc idle  38deg ithink wot
but other ignition setting for like wise engines seem to be all btdc?
the plugs firing before it reached tdc  understanding it advances as the revs increase to pre anticipate the the next time to fire
but still weird some are before .and a few are after ..or am i wrong and my timng settings are wrong
and sorry mercman there is no showcase or mercedes benz after this quiz if you win , but i will sell you my 1969 280s ( 2 50 year old headaches that both start with m)



Title: Re: mercury 650ss 1967 4 cyl
Post by: austral on February 12, 2019, 07:49:20 PM
Water leaking around spark plugs and shorting them out ?


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on February 13, 2019, 09:06:51 AM
The loom in your most recent picture doesn't look real flash. It shouldn't look limp like that (near the support bracket).
Take the electrical tape off and look for perished/damaged insulation of the wires within the loom.
Can you borrow another control box and loom assembly from someone? (I had spare control boxes up until this time last year.) Try speaking to Guy at the Outboard Workshop - Carrum Downs. I sold most of my collection to him.


This is an obvious one... is the vent on the fuel tank open, since attending to all the other suspects?

The other thing I see in the pic.. That's not a 1967 outer. This leads me to think the position of timing mark (decal) is probably not matched to your powerhead. This needs further investigation, only if there is nothing wrong with the wiring within the loom. 

MERCMAN.
 
 


Title: Re: mercury 650ss 1967 4 cyl
Post by: Mark S on February 13, 2019, 12:23:09 PM
I've read everything and you've gone around in one big circle. Need to start from basics again. Mercman's point about mis-matches needs to be kept in mind, it may or may not be contributing to the problem.

Have you checked number one cylinder piston top dead centre to see if it matches the TDC on the label before checking ignition timing? Timing should be checked at max advance which is 32 degrees for a 1967 model. Can be checked at any revs or static.

Don't let a clean spark plug on the bottom cylinder mislead you either, some in-line Mercury's do that.

If you had a houseboat prop on it, it would be revving its head off and getting no-where, not loading up.

Obviously you are using a good brand of fuel like BP and a quality 2 stroke oil like Mercury premium plus or Evinrude XD30.

I would think a 15 pitch prop is not too big, your gearbox should be a 2.1-1 ratio.

When under full load, have you had anyone squirt some fuel in to the carburetors to check for fuel starvation?

Can you post a photo of the spark plugs, so Mercman and I can see them.

Mark S.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on February 15, 2019, 07:19:55 PM
thanks -Austral,Mercman and thanks Mark
Water in the plugs would mean .. in the water at dock reving to 3-4000rpm   waterpump pumping hard would maybe  give me ,missing or lumpy rpm ..not getting that . it revs clean to 4800 under no load ..( i may be wrong )
in the first week-  i opened a can of worms by opening controller  , total re wire as it was all stuffed . water had got in through choke button and all the wire had perished and corroded . all redone  .tested from controller to conections inside the engine therefor testing the loom and black external plug and internal wiring loom for continuity and voltage with a multi meter  .but i will check that loom end again 
vent checked...... i recon every time i  try it ( isnt that the first sin ?)
timing mark lines up and piston top dead  center .. visited that at the time of the flywheel re install and  yep ill re check that
Marks correct.the houseboat prop would still rev ..i didnt read some pdf i found correctly. Information overload
no havent squirted fuel in under load ... and im  using good fuel and oil ..had 91octane  and tried 95 .( which is better?)
i have not tested in the water for 3 weeks. so i should try it again  before i pull it all apart
i have missed something. ive just got to find it




Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on February 17, 2019, 02:20:22 PM
sunday morning .bays flat .slipped it in. idle , ;D out trim it in.....go ! up .up up . slowley revs increase .and we are now ....plaining   ;D
check tacho , 2800 2900 3000 3100..wot played around with trim and had me and mate jumping around up front trying to increse rpm by weight distribution
but moving and plaining    But it was fun ! finally after 1 year i got it to move along
aadd some chop and swell and its probably back to useless again! but is is a positive .(Frankenstien phsyco engine ...gives you a little bit of improvement just to keep you hooked )all it had to do was rev to over 4000 rpm under load !and i would have spent  money  replacing any part with any new parts i could find
on the web .slowley week by week .
Im thinking now ,, becuase i fixed it this far ..of finding another mechanic  drop it off and say nothing of my past history
" i was out last sunday mate and its was not reving over 3000 rpm ..strange hey " and leave it with him  :D :D :D :D :D :D   ::)


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on March 03, 2019, 12:44:03 PM
 used it a few times .
dreaming of a new outboard 4 stroke @ 9100.00 just goto come up with the cash
 also decided to get new stator . under flywheel ,new internal loom and new leads and boots cost around $600 all cdi
if it doesnt fix it ill replace the switch box with cdi replacement around $300 .
timings good link and sink goodstill reving max at 3100 and plaining, so im chasing 2000 rpm .( have voltage fluctuation up and down )
have two rectifiers and both ok so ?
gets me out and back at the moment so im content , at least i have caught a fish .
time has come to start throwing some dollars at it ( parts not  mechanics )


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on March 04, 2019, 08:48:06 AM
Don't wast your time and money on a gutless 4 stroke.

In the particular hp range you're are looking at, you can't go wrong with an Etec. That is honest advice coming from a Mercury fanatic of 57 years.

An Etec's first service is due at 300 hours. Try that with any 4 banger and see what happens!

MERCMAN.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on March 11, 2019, 06:47:33 PM
advice taken thanks mercman
new yellow leads and ,disy and plug boots  and new springy connectors should land from states in the next few days .$90 and $30 postage roughly
last  run i adjustedthe idle jet screws and idle stop on the water in gear . was idling low nicely but after sitting for an hour that setting wouldnt start very well
so i ran both screws back in and then 1 and 1/2 turns out and bang starts in a flick of the key so ill leave it at that. whilst doing so and playing and tinkering with stuff while its running under load with a friend driving ( bay was so flat ) i got a zap
off something around the dizzy- throttle linkage area .  i did run at night to check in the dark to see a short or spark leakage  but it was in drive on muffs with no load . and nothing . so hence get new leads first .. if no change then stator /alternator








Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on March 24, 2019, 08:31:36 PM
new leads and boots arrived last week . .fitted last weekend and took it out today
no change but i did catch a fish!
new cdi Stator ordered and payed for yesterday ....on its way from the usa again
charging circuit only puts out 12.4 volts , i believe this is the problem ,but i have just been avoiding it  probably due to its cost and availability
tested it at wot on the bay this morning .same reading as in the driveway idling on muffs
already replaced the rectifier



Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on April 06, 2019, 11:10:16 AM
i can tell you that pn 174 4793 stator doesnt fit my engine . doh
need part 398 2997. for sale 1 stator
maybe i can get the original rewound ?


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on April 15, 2019, 03:36:08 PM
returned stator (amazon)
found the right one .new old stock  $93 dollars . paid but no email conformation ..i doubt ill ever see it !
very hard to find
found a rewind guy . can do it for under $200 . he tested it and said it was good
i told him it was only doing 12 volts .. under his calculations he said it would ONLY do 12 v
i said it should be doing over 13 -14 to charge the battery ? am i wrong ?
found one on ebay second hand for $170 from states . he said to ask for a resistance . mine is at 0.6 ....if its the same ,its not worth getting he said .......
any ideas
(tried to post photos many times but they are to big? and never get through)


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on April 23, 2019, 12:49:11 PM
I know one would expect to see about 13-14V from the output from an alternator, but I really doubt a Stator could push that high. It will all depend on the condition and rating of your rectifier/regulator, I'm guessing?

I'm out of my depth here.. Mark S, any comment?


MERCMAN.


Title: Re: mercury 650ss 1967 4 cyl
Post by: Mark S on April 23, 2019, 02:53:34 PM
Should get 13-13.5v or 6amps with a working rectifier.
The book says the resistance of the windings should be 0.4 ohms, so your reading is out a bit. I would check the AC voltage by hooking a volt meter to both wires, set on AC volts, should be getting 50-70 volts I would presume as there is not specification on this. I have never seen one of these alternator windings fail, only the wires rotting. Are you sure your rectifier is OK?

Also this stator winding has nothing to do with the ignition and is for alternator charging only, so replacing this will not make your engine run any better.

Send me a PM if you are unsure on this.

Mark S.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on April 30, 2019, 03:55:48 PM
thanks for the input guys
will check output voltage of stator ( dont i need a dva meter ?)
but this statement
Also this stator winding has nothing to do with the ignition and is for alternator charging only, so replacing this will not make your engine run any better
really ??
if its not puting out full voltage then the power is coming from battery and running it down
a non charging alternator in a car doesnt charge .them your battery discharges .your lights dim and the thing runs like crap because there isnt enough power 
going to coil ..therefor weak spark and as the battery looses power the car runs worse till it stops
the stator/altenator ,battery electrical system powers the ignition system
so i dont understand that statment
anyway my stator never came it was a scam website . but i did get a pair of raybans (knock off .but good quaility)instead
i knew a nos stator for $83.00 (as pictured ) and free post was to good to be true ,


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on May 01, 2019, 04:18:20 PM
been told today that at 12.6 volts it wont charge my battery unless i run engine for long time ..like 8 hrs
need 13.2 volts to charge ........stator is down on voltage .


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on December 27, 2019, 03:33:35 PM
and thats a wrap!
update
stator is ok 100percent fine
so what the problem was  , is that i needed a new paint job and stickers
and when doing so replaced the aluminium mercury fuel connector on the outboard ( saw it leak while priming )
and got the old spare prop that the boat came with .. it was chipped and dinged
 used aluminium tig wire to weld into prop to repair roughly . stuck it on ]and took it out today 120 days after last post
bingo  outboard dug in , nose went up in air and the boat took off!
couldnt go wot as my 10 year old son was shitting himself ....to fast dad!
so it ended up being everything above ,  to get the engine puring. and reving to 3200 ish and it was the pitch and size prop ( fitted to engine when purchased)that was effecting the rpm .ill run it again tomorrow and then get myself a new aluminium prop
the one i put on has a mercury no 4477342a4 15p  the one i took of had nothing
12.5 x 15 p  ( need to re goolgle )


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on February 14, 2020, 04:13:40 PM
next run 4800 rpm and flting
till it slowley died restarted running on 3 cylinders
 new mechanic comfirmed no comp on no 2 , removed powerhead and pulled the whole thing apart
 melted rings and piston on 2  old fuel and poor cooling
redex coated in cooling circuit and silicone used to repair gaskets ,excess fouling holes, blocks been cracked and welded
 and   advised that i need another block :(
wanted . 1 block


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on February 17, 2020, 06:04:53 AM
Hi mate,
Your 1969 decals and new paint job make her look quite smart indeed. I don't feel a used replacement block will be that hard to come by. The trick is, you'll have to advertise and post on every website/forum you can find on the internet.

I would start with Aaron J on this forum. He had a number of 65's. However, his may be a little older that yours and may not be compatible with your mid-section and some electronic mountings (in the block casting).

Your motor should have Thunderbolt Ignition, I don't believe any of Aaron's motors will.
I'll keep my eye out for you.


MERCMAN.  


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on February 17, 2020, 04:16:12 PM
once again thanks mercman
( and to those that read this please also check out "the future of the board"  article
it would be a shame to loose this australian forum.


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on February 19, 2020, 06:06:36 AM
Ant,
This Block may get you out of trouble? Check the part number first.
Note: One Pot is showing scoring, which may be OK with a hone?

https://www.ebay.com/itm/Mercury-65-HP-Cylinder-Block-and-Crankcase-Assy-P-N-3997A3-Free-Shipping/251983773175?epid=1550237414&hash=item3aab673df7:g:GmYAAOSwpdpVcKt1

MERCMAN.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on February 25, 2020, 02:40:45 PM
yeah but the postage kills it and it could be a throw away aswell
 thats it
im finished.. not worth the 1000 dollars and time to get it up and running only for some other parts to fail
 thanks for your help mercman ......much apreciated



Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on May 25, 2020, 05:08:47 PM
update
mate bought a 85 hp 4 cyl 1973  and dropped it off   
has same ignition system and stuff and read that the 850 powerhead will fit the 650 leg and gearbox
but it doesnt ... its needs alot of work  dont know anything about it but it has been laying around for 4 years ,,, but it did work ...heard that before !!!!
only cost 4 slabs ...so now i have 2 outboards that dont work
then 48 hrs later he found a 1971 650 complete engine , picked it up yesterday
 that makes 3
650.powerhead was seperated from leg , rewired stator ,rewired dizzy .
i need to  compression test it first (and the 850) 
may be good and i can bolt it on my leg       cant be that easy

 


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on May 25, 2020, 06:42:49 PM
Hi mate,
A 1973 4 cyl 850 powerhead has the same stud pattern as the I6 blocks of the same era. Be careful, gearbox ratio's are different.

I have a feeling the 1971 4 cyl 650 will have a different stud pattern to your original 1967 650 Franken Merc. Maybe not?

FYI, The pistons from an early 650 will fit some of the early 90Ci I6 Mercs
       The pistons from a '70's 4 cyl 800 & 850 will fit all 99Ci I6 Mercs. (high HP I6's, have bigger ports (windows) in the sides of the pistons)

MERCMAN.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on May 25, 2020, 07:57:00 PM
Hi mate
 your scaring me
so i took old powerhead out of coffin and it fits the new leg and  both blocks say 834-3997 
stud pattern matches . thats good hey




Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on May 26, 2020, 09:27:00 AM
You're in luck! Good work.

MERCMAN.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on May 29, 2020, 05:53:17 PM
has factory lead seal on crank case bolt


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on May 29, 2020, 06:32:17 PM
looks good but i think no compression ..49 years old and still a factory seal .never been opened
 the guy before rewired stator ,and dizzy
dizzy is stuffed lol , he broke the rotor of the shaft and rewired the internal . now all bulging and also bent disk .hes also removed the flywheel of the pulley
hopefully one of the flywheels of the 850 will do, or i use the old flywheel and stator . i have 2  matching switch boxes for 650
my mate got another 850  so now 4 powerheads  and still cheaper than a used block and postage from the states
will steal the dizzy from the 850 its a match for the   new 650  but different linkages
1 850 has no lower gearbox unit (apparenly shattered at sea
the other has a crack running from prop toward gearbox underneath 2.5 inches long  repairable ?
still a alot of r and d too go


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on June 01, 2020, 05:21:02 PM
re the compression.. On the Port side of the block, you should see two transfer port covers. These are held in place with rather large Phillips head screws, remove the screws and gently prise the covers off. This will allow you to look at the sides of the pistons and the rings and look across and you'll see the bore on the other side. To move the pistons, you'll need to re-install the crankshaft key and push the flywheel on by hand. No need to do up the nut for this exercise.
This inspection, is a quick and easy way to determine if the pots or pistons are US or possibly OK?
 
Something is telling me the firing order of an older 650 and a newer 850 is somewhat different. I would stick with the 650 flywheel.

The crack in the gear case is usually caused by water lying at the bottom of the inside of the hub for a period of time. The "carrier" will expand and then the case (oysters) cracks. If the carrier still has a good seal near the prop, the oil should be still free of water which means the case can be welded (by an ace). If there is ware in the gearbox oil, chuck the lot.

MERCMAN.
 


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on July 27, 2020, 02:34:15 PM
havnt done much too cold outside
but pulling things apart
these impellers seem to be almost to big for the housing
but same on both legs from 65hp


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on July 28, 2020, 08:06:50 AM
Hi mate,
The impeller is the correct one, albeit requiring replacement. However, I can understand your assumption should you be use to dismantling OMC water pumps.

This Merc impeller is arguably the most interchangeable component (between Merc models) from the early 1960's through to the 2.5ltr Mec V6's of more recent times.

Remember, after you have seated the new impeller on the pump base and are about to press the the pump housing on top of the impeller, make sure you rotate the drive shaft (not prop shaft) clockwise until the housing seats.  

If you have any plumbers silicone (for O rings and rubber washers etc) smear it inside the pump housing and onto the top side of the stainless steel pump base plate, before reassembly.

MERCMAN.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on July 28, 2020, 04:25:16 PM
as always thanks
https://youtu.be/hK6qbQwLoMo
link to  last run video when it dies ;D


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on July 29, 2020, 10:29:17 AM
eek!
That video is hard to watch, I shed a tear.   :'(

I note your video says you were at WOT when the seize occurred.
Do you know what RPM you have at WOT? By the sound of your motor, you weren't within the recommended WOT RPM range. This could mean you have a propeller with too much pitch for the given load. This can lead to other nasty issues, if not corrected.

MERCMAN.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on July 29, 2020, 04:46:05 PM

i think 4800-4900
before it was 3600 with the crap prop but this prop had mercury code on it and is 48 77342a4 15p
do you think rev
2 high ?
too low?
or does it sound like its running on 3 cylinders already? ???


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on August 01, 2020, 09:04:29 AM
Hi,
I'm unsure (confused) as to which block you have fitted?
If 4 cyl 850 the recommend WOT range is 4800 to 5500
if 4 cyl 650 the recommended WOT range is 4800 to 5200 or there abouts.

I can't figure why you are only achieving only 4900 with a 15" pitch prop?  Have you got the correct gearbox fitted to the block you are running? They are different ratios.
What position is your tilt pin, if hole one, try hole two or three. You hull may have too much wetted surface when planning?

MERCMAN.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on December 02, 2020, 10:17:17 PM
compression test all done .even on all 4  ( 90 psi useing a auto tester with a rubber hose so i think maybe 100-110 with a mercury close fitting one the mechanic had ..... .. cleaned everthing and reassembled .ended up installing my switchbox, rectfier and dissy,used the new rewired stator and flywheel belonging to this powerhead ..i used my stater motor and solinoid  .2 x gaskets from the usa.powerhead to exhaust and exhaust to mid section
new impeller  carbies cleaned ..cranked timed and linked and sinked .fuel connected  started  ..idles revs pumps a s---load of water out telltail
hopefully it does what its supposed to do on the water


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on December 04, 2020, 06:22:06 PM
Hi Antman,
Well, I must say.. I really thought you were going to give up at one stage!
That noise you can hear.. is me clapping, well done indeed.

However, you have omitted fitting one small safety device. It's called a Mercury switch, of all things. It interrupts the ignition should you hit an obstacle at speed. It should be mounted diagonally on the side of the Exhaust Chest. I strongly suggest make sure it is fitted and wired correctly.

Trusting your sea trial is successful.

MERCMAN.
 


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on December 04, 2020, 07:02:57 PM
hi mate i did
hard to get rid of a boat with no engine
thanks for the kind words and support
i frankenmerced the frankenmerc
and yes the switch ..there is an outline on the plate of where it was and thats what the red wire was for
i wasnt going to bother but ill take your advise and track one down asap
and then the 65 should be  complete back to what it should be  even the power head color, silver not black




Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on September 22, 2022, 06:11:28 PM
starter motors ......just fired it up  well it didnt .  broke the shaft on the starter holding the small gear
..used it twice over the last two years ... had diaphram trouble in the fuel pump  .. replaced it and never got back out
pulled it out for spring and whammo
also bought a internal wiring loom cdi  for it
was starter no 50 37274 have spare  but part number 50 58788
doesnt have tapped thread for the starter solinoid  in the casing but (
can i use it  ?or is the gear on top not suitable for the flywheel
thanks ant


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on September 23, 2022, 04:55:40 PM
I've not head of the pinion gear breaking off!!
Pull the spark plugs out and make sure you can rotate the flywheel easily by hand, before proceeding with anything else.

Mercury were very clever at using the same components on quite a number of models, thus saving huge tooling costs. I'm not familiar with the Part Numbers you have quoted. However, small enhancements to existing components did always necessitate a new Part Number.

In the 60's and early 70's there wasn't a different Flywheel for every Horsepower in a given year of manufacture.

Without seeing the two components side by side, I'd say give it a go.

MERCMAN.



Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on September 23, 2022, 05:43:13 PM
Ant,
You may like to watch these Duelling 650's

https://www.youtube.com/watch?v=gzLf8pGNfNU&t=3s

MERCMAN.


Title: Re: mercury 650ss 1967 4 cyl
Post by: antman on September 29, 2022, 06:42:15 PM
Thanks Mercman
video was cool they pretty quick
the starter shaft broke under the pinion gear just wehre a littke hole is to take the end of a spring that sits under the pinion gear
maybe a little corosion and time
 put the spare on . had a weight under pinion gear and no spring slightly different but same main body and mounting holes .
google said it would fit multibale motors of that era   .
starts well and didnt smash anything ( did spin motor by hand first )
up and running again .after new fuel diaphram internal loom and startermotor
another test .


Title: Re: mercury 650ss 1967 4 cyl
Post by: MERCMAN on September 30, 2022, 08:14:39 PM
I admire your persistence Ant.

MERCMAN.