Re: Johnson 3HP JW-17 Compression woes

[jerry-w-bert]

To Jerry Ahrens :Found 3 rings which would not move at all . Two on upper Cyl . where comp is worse . The one that did move only pushed in slightly. I put in some Seafoam with the engine on its side like you suggested ,came back later and the one that did move ,depressed more. I have a can of deep creep ,best penetrating oil I’ve ever used. The can said it works on carbon deposits .I squirted some in and 10 minutes later 3 out of 4 are depressing enough to squirt out the deep creep in the ring grooves. So I am going to let the one soak over??!!!!! night and check it again in the morning .I will wash it out with carb clean when they are all good and free.

To Outbdnut2 , Buccaneer and FrankR, Thankyou ,my check valve is at the gague. I hope that is a factor in my favor, however i used the same gague for both sets of readings . Since i have found 3 totally stuck and one partially stuck ring I am hoping that they are the main problem because 3 out of 4 are free now. I will proceed to redo the head properly and then take readings again and try to crank it up. Thanks to all and i have a question to all .

Question : I did not use gasket sealant on the head , should I ? Maybe part of the problem? I am waiting for a new exhaust cover plate gasket . None found locally. Also what are your recommended initial needle valve settings to start the engine.