Compression/rings?

[trent_tweeter]

77 v6 175 after a long run, warm engine
#1-75
#2-6 110-115
1 oz oil added to #1 reading jumps to 120.
Is this a ring issue? Would a decarb help diagnose problem.
Whats involved in ring replacement?

 

[Daviet]

Re: Compression/rings?

Usually when you add oil to the cylinder and the compression comes up it indicates a ring problem.
A decarb might help, it can't hurt anything.
To replace the rings you are going to have to tear the engine down, remove the pistons, and replace the rings.

 

[trent_tweeter]

Re: Compression/rings?

How much tearing down is involved? Full removal of powerhead?

 

[Dhadley]

Re: Compression/rings?

No tear down is needed for a decarb job. Get a can of Engine Tune from any E/J dealer and follow the directions, concentrating on the low cylinder naturally.

 

[Mas]

Re: Compression/rings?

Yes!

Remove powerhead, split crankcase, remove rod bolts, remove head.

Better get a manual!

Mas

 

[Boss Hawg]

Re: Compression/rings?

How much tearing down is involved? Full removal of powerhead?

Pull the head first & see what it looks like-
Just went thru the same thing on a Johnson 115 & found scared cylinder
One step at a time