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 on: August 03, 2020, 05:14:16 PM 
Started by Russo - Last post by MERCMAN
Hello Darrcoll,
I require your advice. I sent you a PM last week. Does your email address remain unchanged?



 on: August 01, 2020, 11:34:42 PM 
Started by MERCMAN - Last post by True blue
Tasmania. $200 on Gumtree.

 on: August 01, 2020, 09:04:29 AM 
Started by antman - Last post by MERCMAN
I'm unsure (confused) as to witch 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 planing?


 on: July 29, 2020, 04:46:05 PM 
Started by antman - Last post by antman

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? Huh

 on: July 29, 2020, 10:29:17 AM 
Started by antman - Last post by MERCMAN
That video is hard to watch, I shed a tear.   Cry

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.


 on: July 28, 2020, 04:25:16 PM 
Started by antman - Last post by antman
as always thanks
link to  last run video when it dies Grin

 on: July 28, 2020, 08:06:50 AM 
Started by antman - Last post by MERCMAN
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.


 on: July 27, 2020, 02:34:15 PM 
Started by antman - Last post by antman
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

 on: July 27, 2020, 11:14:21 AM 
Started by Excess - Last post by MERCMAN
G'day Dave and Nigel,
Sorry I missed the above transmissions, my Laptop has been with a local tek guy who was installing a new Outlook account for me.

Clearly I have my Laptop back with me now and it's quite working well. (I think it was a fuel blockage lol.)


 on: July 27, 2020, 12:13:31 AM 
Started by MERCMAN - Last post by True blue

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