Quote:
Originally Posted by Fixer
I'm repairing a 930 case now that has 10 pulled ARP head studs. 7 on the left bank and 3 on the right bank.
To test and find all that pulled I torqued all to 60 ft lbs. The ones that handled 60 no problem I will leave alone. Once the Snap On wrench clicked at 60 I immediately backed them off.
The 10 that are pulled I will Time Cert. The motor ran strong but I noticed that subtle loose exhaust sound.
When I checked the head studs initially I used 24 ft lbs and and several just wouldn't tighten. I looked with a mirror and could see the nut climbing up out of the head.
60 ft lbs found the rest. Some still sorta hold and pull slowly.
This is why I decided to contact ARP. This engine was just done using ARP I don't know for sure what torque was used but I suspect 38 bc the tight ones that did not fail were really tight.
Matt
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OK, not trying to be difficult, here, but...
Not sure I follow the reasoning for this "test". IMO all this proved is you can pull studs from a case if you torque them hard enough, ruined a set of studs by stressing them past yield, and probably warped the heads and case?
I think this thread would get a lot more traction in the engine rebuilding forum. This has been beaten to death over there.