Re: 3406B Cat breaking manifold studs

Posted by fixerupper on November 11, 2015 at 05:39:01 from (100.42.82.100):

In Reply to: 3406B Cat breaking manifold studs posted by fixerupper on November 10, 2015 at 17:36:46:

OK, talked with my son this morning. It does have standoffs on the studs I did not remove this manifold and this is the first time I have worked on it. The holes are 1/2" for the 3/8 studs but it does not have Belleville washers. The previous owner told my son he was having trouble with broken studs too and the truck has straight pipes. My son couldn't stand the noise so we stuck a resonator on it. Still too noisey so we put a muffler on too. Studs are still breaking . He said the pump is mildly turned up and the pyro will occasionally go to 1200 on a hard climb. That pyro temp sends up a red flag to me but I don't know what this setup can withstand. Today we will be checking the manifold slip joints.

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