96 Johnson 225 zero compression upper right cylinder

[cobbcfi]

Having major issues, J225txede engine, engine won't fire.. Did a spark test and bottom left and middle right bank have no spark.. 5 cylinders have compression between 100 and 110, the upper right cylinder has zero... Removed and re-installed the compression tester several times with no luck...

With all spark plugs removed, the engine will only spine about 1 rotation or less on 5 cylinders tested but upper right the engine turns and turns without issues other than the Guage reading zero!!

I know if all cylinders are around 10% of each other regardless of the number range but how the hell am I getting zero on one of them?? Is that a blown gasket or collapsed rings?? I bought the remanned power head about 5 years ago and it's been running great..

Any help would be great!!

 

[racerone]

Blown head gasket or major cylinder issues.----You have no choice.---Cylinder head must be removed for a look see.

 

[cobbcfi]

A blown gasket could bring it all the way down to zero?? Damn... I'll pull the head off and take a peek..

 

[cobbcfi]

Are these headbolts like a car engine and must be replaced or can they be reused?

 

[dingbat]

Are these headbolts like a car engine and must be replaced or can they be reused?

Not high torque. You could reuse

 

[cobbcfi]

 

[cobbcfi]

 

[racerone]

The heads will be warped ( they all are ) , refinish them before installing.

 

[cobbcfi]

Left bank compression is great but I'm checking for warp and replacing the gasket regardless.. The right bank is great minus the top one.. I'll check for warp, if I get the head machined I might as well do both, right??