[demarest652]

with the cap on or off ?

 

[killerbee]

air in your system.

 

[TxChristopher]

Its a blown head gasket at minimum. Now to demonstrate it to the dealer and have them fix it under the 100k engine warranty, then all will be well. :Thumbup:

 

[idahofox]

Its a blown head gasket at minimum. Now to demonstrate it to the dealer and have them fix it under the 100k engine warranty, then all will be well. :Thumbup:

It might be an "H_G", TxC would know, and how to check for it.

I would check the " Free-bies " first, then..................

FWIW; with respect !

 

[TxChristopher]

It might be an "H_G", TxC would know, and how to check for it.

I would check the " Free-bies " first, then..................

FWIW; with respect !

Hi idahofox,

Through PM's I had him run some tests on his truck, and everything came back positive for a blown head gasket. It is definitely a blown head gasket at least, and possibly warped heads now. He has instant hose pressure once boost come in, and even after the truck sits all night it has rock hard hoses.

He is gonna take it in to the dealer for the warranty work.

 

[chloeourdog]

Anyone know what may contribute to a blown head gasket - I used to have a 1989 Firebird Formula with a 5.0L V8 that was notorius for blowing intake manifold gaskets because the intake was aluminum, the block was cast iron and the gasket they used to mate the two did not expand correctly to accomodate both metals. Do you think there a gasket or metal issue in this case or is it luck of the draw or is it another problem?

 

[TxChristopher]

Anyone know what may contribute to a blown head gasket - I used to have a 1989 Firebird Formula with a 5.0L V8 that was notorius for blowing intake manifold gaskets because the intake was aluminum, the block was cast iron and the gasket they used to mate the two did not expand correctly to accomodate both metals. Do you think there a gasket or metal issue in this case or is it luck of the draw or is it another problem?

I am beginning to wonder if it has to do with the three different thicknesses of head gaskets they use. There is an A, B, and C grade gasket, the difference is supposed to be thickness. Perhaps the thicker gasket is more prone to blowing due to more surface area, who knows. Maybe the thinner one lacks material to keep a solid seal. Some trucks sure seem to let go of head gaskets easily, notably easier than most.

There are so many factors though, I dunno that a specific source of it could be pinned down by us. If I were to get access to the motors like GM does, maybe I could find a more common cause, but otherwise its a crap shoot.

I have often wondered if the gasket thickness has a bearing on the ease of overheat too, but exploring it is an exercise in futility because you have to tear it down to see which gasket is in there.

 

[TxChristopher]

Anyone know what may contribute to a blown head gasket - I used to have a 1989 Firebird Formula with a 5.0L V8 that was notorius for blowing intake manifold gaskets because the intake was aluminum, the block was cast iron and the gasket they used to mate the two did not expand correctly to accomodate both metals. Do you think there a gasket or metal issue in this case or is it luck of the draw or is it another problem?

The small block went through a major redesign seal wise around 86 and it took them several years to get them all right. The TPI Camaros/Firebirds had those gaskets that had sorta o-rings built into them. They changed the angle too on the bolts that held the intake to the heads, standing them up, which was not the best move because the intake was no longer being drawn directly to the heads but rather pushed downward like a wedge into a V. Due to the angle of the bolts it was far easier to end up with uneven torque on the intake manifold, which led to leaks after it went through enough warm up cycles. You started seeing a lot of the new anerobic sealers too around that time, as well as one piece seals on the crank. They also went to centerbolt valve covers which were nice and a definite improvement over the old design. Once you got to the 90's cars they had it down good. :Thumbup:

GM has a history of letting the customer "test", but I suppose they all do to some extent.

 

[demarest652]

Thank you to everyone for your help. The dealership said bring it in we'll figure out whats wrong with it. If it is a blown head gasket we'll fix it as long as nothing outside the motor caused it. (basically unless we can get out of it) but they said if they get it apart and find that they think i did something to cause it there going to stick me with the bill. Which they quoted me at a minimum of $4500. so i traded it in im sure they wont have any trouble gettin gm to pay for it now. So im no longer a member of the diesel world. I bought an 05 yukon. with a 100,000 mile bumper to bumper.

 

[Guest]

Well...don't be too much of a stranger. You still gotta get your diesel fix. Plus...it won't be long and you'll feel the yearning for another oil burner.

 

[demarest652]

I will own another oil burner soon. This time it wont be a daily driver though. I have always wanted to put a diesel in a 1/2 ton 2wd reg cab 90's chevy truck so thats probably going to be the new project. Im kinda feeling a 12 valve cummins with twins. but who knows