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Author Topic: mercury 650ss 1967 4 cyl  (Read 12094 times)
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MERCMAN
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« Reply #45 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)

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antman
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« Reply #46 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


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MERCMAN
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« Reply #47 on: May 26, 2020, 09:27:00 AM »

You're in luck! Good work.

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antman
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« Reply #48 on: May 29, 2020, 05:53:17 PM »

has factory lead seal on crank case bolt


* -4017331725166058637.jpg (1142.25 KB, 2592x1944 - viewed 23 times.)
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antman
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« Reply #49 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
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MERCMAN
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« Reply #50 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.
 
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