pressurizing coolant system
Ok so when i get on it hard pulling a decent load uphill with boost at 35-40 and pyro at 1000-1100 i am puking coolant due to blown head gasket. I was towing with 18 degrees of timing and I thats just to much i figure. So its set at 15 now.
Now for the question: My o-rings are ten thousands I have heard that this is great for contact pressure but it is in such a small area that it can be bad. Should in get shorter rings and if so what size. I had 40,000 on the last head gasket so I figure the higher timing and the towing must have done it. anything would be helpful right now I don't wanna do the head gasket with those rings if they are not optimal for my application and I really am over the beating the tar out of my pickup just goin for reliable Hows it go again FAST CHEAP RELIABLE pick any two right |
im not sure but im wanting to learn also. because im running the same and worry every time i start the rig
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From what I hear four thousandths is good but we'll see
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Mine are at eight. Retorque on the head studs after heat cycles are important when running o rings.
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i forgot what size o-rings i got but i torqued my head studs to 150 ft-lbs cold then hot then did it about 4 more times
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Most of the time the o ring consists of a .041 stainless steel wire which is installed into a .030 groove in the head. That leaves .011 potrusion, this works well in gasoline race engines because they normally use copper head gaskets with o rings. Since cummins gaskets have a hard solid fire ring I had my machine shop only leave .008 potrusion. I torqued my ARP studs to 140psi 4 heat cycles. I also spray the gasket with copper coat to help seal the water.
Derek |
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