Got an answer to the engine knocking

[rgreenwell8962]

Two cylinders with a compression of 0 and 20. Guess that will cause some knocking. Now the question: is it repairable or should I just get a new engine?
Beginners luck huh?

[seapuppy]

well...first off you need to get the head off and see if there is a crack or just a warped head...blown head gasket...then replace the gasket...get the head trued and shaved....reassemble....what I'd suggest you do...is make sure that both sides are checked and if there is any doubt on the opposite side...pull the heads and check it ...replace the gasket ...and reassemble...
don't think you'll need a new engine......only if your block is destroyed or some serious crank damage....you also need to check the runout of the pistons on the bad side...
well...thinking about it some more..I'd pull the engine..tear it down..rebuild it with new bearings and gaskets....checking everything...piston wrist pins..bearings and rings....

SP

[rgreenwell8962]

Welcome to boating ey?
Olympic Boats have got er. They are going to tear into the engine and see what they find. The pre-purchase compression test showed 4 and 6 being a little off, but within range. The two causing the trouble are 3 and 5. Three has 0 and 5 is at 20.

So much for boating season. Maybe I'll just pop a 496 Marine Longblock Hi-Perf - Dressed 460 Hp @ 5400 RPM & 515 lb/ft @ 4200 RPM in her. Yeah right.

Originally Posted by seapuppy

well...first off you need to get the head off and see if there is a crack or just a warped head...blown head gasket...then replace the gasket...get the head trued and shaved....reassemble....what I'd suggest you do...is make sure that both sides are checked and if there is any doubt on the opposite side...pull the heads and check it ...replace the gasket ...and reassemble...
don't think you'll need a new engine......only if your block is destroyed or some serious crank damage....you also need to check the runout of the pistons on the bad side...
well...thinking about it some more..I'd pull the engine..tear it down..rebuild it with new bearings and gaskets....checking everything...piston wrist pins..bearings and rings....

SP

[seapuppy]

BOAT=Break Out Another Thousand...


sure would make that boat plane easier!!....

keep us informed in the process and how it all goes..

sorry for the pain!..

SP

[SilveradoSS]

it can be cheaper to buy a long block rather than try to rebuild the old one. I have a friend that did a rebuild and then got to buy a long block because of a stupid mistake on his part.