J115PLSOR cylinder bank temp difference

[Harkonnen]

Here come ugly pics

 

[saltchuckmatt]

Cylinder walls are roached.

Brown gaskets are better.

I feel for you...

 

[dingbat]

Except is is not coolant, and it is not intake/exhaust. It is port cylinder head vs starboard cylinder head, temperature of actual metal.

Head temps are the direct result and proportional to coolant temperature and flow

Basic thermodynamics

 

[Harkonnen]

Head temps are the direct result and proportional to coolant temperature and flow

Basic thermodynamics

No kidding.

 

[racerone]

Whenever I see brown / rubber gaskets it is consider good maintenance by me.

 

[Chris1956]

That is a terrible job by the rebuilder, if you want to call them that. When I installed my rebuilt powerhead, you could see that every bolt had been removed, the holes retapped, and new gaskets installed. Obviously, some of the orig bolts had snapped, but these were repaired as well.

My rebuilt powerhead never had the power of the original motor, which I had from near new, but it ran fine and was reliable.

 

[Harkonnen]

Yep. Replacing the head O-rings, thermostats, thermostat seals, springs, and properly resealing the cylinder heads appears to have resolved the temperature asymmetry (tested on water), oil loogies, hard starting, and excessive smoke.

Which, unfortunately, does not speak particularly well of the quality of the "rebuild."