Compression woes, 1982 115

[nswtex]

Ok so I have compression results of 75/115/115/110. What are my options here. Someone said something about a sleeve. My local shop wont touch it unless they do a full rebuild. Someone help me out to patch this thing so I can get just ONE season out of her and the beer is on me.

 

[trendsetter240]

Re: Compression woes, 1982 115

Well it all depends on why the compression is low in that cylinder. If it's from stuck rings (stuck from carbon buildup) then a thorough de-carb might just bring that compression back up. If it's from scoring on the cylinder or worn/damaged piston or rings then you will have to rebuild.

Maybe it's a blown head gasket too..that would be an easy fix but usually you get two low cylinders side by side when the head gasket is gone.

Follow the instructions for a full decarb procedure on this site and then test the compression again. All you got to lose is the cost of a can of seafoam.

Good luck!

 

[bob johnson]

Re: Compression woes, 1982 115

you have to pop the head on that bad cylinders side and take a look...maybe youll get lucky and find a bad gasket..doubt it... though..

what are your expectations of the boat this summer??

Id give up the WOT operations..like skiing and tubing...with a boat load of people..

if you just drive around and fish...maybe you'll get by...

my buddies 88 spl was running and would move his pontoon around up to 12-15 mph and it had zero compression in one cylinder!!!

if the cylinder is scored and the piston or rings are damaged...there is no bandaid!!!!

you will still have an issue with what ever caused that low compression, if it isnt fixed.

good luck

bob

 

[ezeke]

Re: Compression woes, 1982 115

If you continue to run it without knowing the problem you run the risk of damage so severe that the engine cannot be repaired.

In any event, you should remove the cylinder head so that you can examine the cylinder, and possibly remove the bypass cover so that you can see part of the rings. You will need new gaskets.

You have to remove and disassemble the powerhead even to replace a ring, so there is not a huge difference in time from a partial repair and a complete repair.

 

[nswtex]

Re: Compression woes, 1982 115

Ok so assuming that I know that the compression issue is from scoring and poop and the engine had just been decarbed and serviced with a basic tune up then can I just putt putt around to my local fishing spot and forget any kind of high speed or watersports? Any more experience like the guy with the pontoon boat?

I just want to get a little out of her this season before undergoing a repower or major surgery.

 

[trendsetter240]

Re: Compression woes, 1982 115

Ok so assuming that I know that the compression issue is from scoring and poop and the engine had just been decarbed and serviced with a basic tune up then can I just putt putt around to my local fishing spot and forget any kind of high speed or watersports? Any more experience like the guy with the pontoon boat?

I just want to get a little out of her this season before undergoing a repower or major surgery.

It'll probably keep running for some time...though it will continue to get worse. My guess is you could get another 5 minutes or 50 hours out of it. Ultimately will find yourself dead in the water when it finally fails completely.

However if the cause of the scoring in that cylinder was a lean condition or a broken ring then it is not going to last long at all.

 

[nswtex]

Re: Compression woes, 1982 115

Well I think I will go scuttle her tomorrow, anyone need a mooring anchor at Lake Lewiville