WATER PUMP LINER

Nordin

Commander
Joined
Jun 12, 2010
Messages
2,555
Take the block to a workshop that can machine it.
Measure the bore and rebore it, I think you are able to rebore to 040 oversize.
No need to put a new sleeve in if you can rebore.
 

MPHORSMAN

Cadet
Joined
May 20, 2022
Messages
19
Take the block to a workshop that can machine it.
Measure the bore and rebore it, I think you are able to rebore to 040 oversize.
No need to put a new sleeve in if you can rebore.
would not an oversized piston make the other three out of balance? As the assembler I am guessing that would be up to me to grind down and weigh the pistons. where to get an oversized piston is a question also.
 

Nordin

Commander
Joined
Jun 12, 2010
Messages
2,555
No problem with out of balance, you can rebore up to 040 with no problem.
If you do as much as 040 oversize you maybe have to rejet the carb feeding the rebore cylinder.
The Chrysler block that has 3,312 in bore can be rebore up to 040 oversize and I think your 115Hp has the same size of the sleeve meat.
Are your 115Hp the one with 3,375 in bore?
115Hp 1981-1982 had another piston size and seams to be N/A.
You can get pistons from many supplier such as Franz Marine (not a web site), Mastertech Marine, outboardpartsdotcom and others.
I have rebore a couple of Chrysler/Force engines not a 115Hp as yours but 3 cylinders 70 and 75Hp.
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
37,818
Some will argue.-----On outboards it is done all the time , one cylinder with an oversize piston.-----Not a problem.
 

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
18,037
Forgot this, on the OEM pump, there's no liner for your pump

I rebuilt an 87/125 in 1994 and replaced just one piston.
It's still running today.
 

kbh121956

Chief Petty Officer
Joined
Jun 30, 2013
Messages
486
DO YOU CARRY, OR KNOW WHERE I CAN GET ONE, THE WATER PUMP LINER FOR THIS? 1980-81 Chrysler- MOD. 1158HOD - SER. 1528 - 115HP
It is the same for a Mercury of the same size and year.
Thanks, Mike
 

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
18,037
No liner for the pump.
They came bare pot metal.
The pot metal can be in really bad shape and still work.
 
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