3406e exhaust studs

I've never had to do a manifold on a Cat. I do wonder though if pushing the manifold all the way together is the issue? The sections have nowhere to expand to so they try to force each other apart possibly.

I do recall Cat has a tool for centering the manifolds, no idea what it looks like or how it works.

 

Crankshaft dampener might need to be replaced. Once it doesn't absorb the energy from the crank when it rotates, that energy goes to all sorts of places. Vibratech says mine for a S60 Detroit should be replaced every 500k miles. Before I learned this years ago, I had lots of problems with bolts/fasteners: manifold bolts, AC clutch bolts, alternator bolt for the old V-belt style, etc. I've heard you will wear out a clutch faster, too

 

Yah, 2 months seems real fast for bolts to come loose with a bad dampener anyhow.

 

@wore out

 

Anything heat related to do with a Cat, I only bought Genuine Cat parts(Hardware). I had the head replaced when I had my Cat a few years back, My Cat Guru warned me to have all studs and nuts replaced because when you reinstalled the exhaust manifold, the old ones might bottom out and you will have an exhaust leak eventually.

 

I used to go through that until I put a new manifold on. Haven't had an issue since.