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Everytime I have filled it I either use the air valves in the after cooler and heater core to get air pockets out or I use my rad kit to vacuum all the air out of the cooling system and fill it. That way it isn't possible to have any air pockets. It's got to be getting pressure from somewhere...

I did and it still built pressure in coolant. I also unhooked the coolant lines off the compressor and ran it and no air came out of those ports on the compressor head.

Yea it was but it's intake comes from the engine intake so it had some carbon and stuff. The head has a coolant inlet and outlet though and there is no place a gasket leak will cause air into coolant. Like there is not place a gasket touches coolant

Well, here's an update. Took head off compressor, there is not gaskets separating a coolant and air passage, so a leak isn't possible unless the head was cracked which I ruled out by running it with the coolant lines off and no pressure built in it. I'm going to dump a bunch of coolant sealer in...

I ordered the compressor gaskets, the head gasket and plate gasket was like 3 dollars so I guess we will find out if that is iy

If the rings were above the pit then I wouldn't be having gasses enter the coolant because compression rings would be keeping it out. At least it would only be blow by entering coolant which would still set off the combustion gas tester

Tested for combustion gasses in coolant several times. Pitted liner would cause this however with no combustion gas detected in coolant, sort of rules that out, especially with no water in oil and no oil level growth. When the engine is shut off the higher pressure coolant would fill the...

That sounds feasible, how might I rule that out, is there a way I can disable it and run the engine?

Replaced the head gasket yesterday, old gasket appeared ok. The root cause of the over heating is the over pressure I'm getting because i def should not be able to feel pressure built on cap at idle right after I start it.

I've got a 1991 m923a2 with the 8.3 cummins, if overheated on me a while back and I flushed the coolant, because it was full of rust...ever since then it has been pushing coolant out the cap right after it is started, and it overheats if you try to drive it. I am a diesel mechanic but every...

I have a 1991 m923a2 with the 8.3l cummins, I am needing a head gasket. I've called cummins parts direct and they need an engine serial number which I can't find. I've looked on all the usual surplus sites and can't find one. Any of you have a source for these or atleast a part number I can give...

Typical diesel compression on the fords I work on are 350+. I would say the cylinders you have 350 on are fine

A bad head gasket would manifest as over heating and cooling system over pressure before it would yield no compression.

Could have melted a valve or if it messed up the head then it would not blow into crankcase.

If the injector hung open, there is a chance that you've melted a piston or scored a cylinder. Second the compression check, if low then inspect valve train and if that's good then your yanking a head.