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Hi, my service manual states to replace the crank and cam bolts, but does anyone reuse them?
I cleaned the cam bolts with a thread chaser and it removed some of the coating. That ok?
If the manual says to replace them, you should replace them regardless of what advice you get. Do you realy beleive that the MoCo would tell a tech to replace a bolt just for fun?
I've been using the ARP bolts for awhile now as I always replace the OEM parts. Per Feuling these are reusable as long as you don't exceed the torque values on the bolts.
The call out for new bolts is for convenience to the mechanic at the dealership.
They come clean and usually with the correct dry coat encapsulated epoxy locking compound.
Clean threads with a die nut designed to around a GH5 size for cleaning and straighting a damaged thread. Not cutting. It's 0.0025 over basic.
I would definitely replace that.
I would like said replace fastner parts steel to steel on the engine.
As long as you clean properly and use correct locking compound as called out, fastners is aluminum can be reused. Don't use locking compound on maintenance covers with gaskets.
The gasket squeeze keeps them tight. And they will tend to stay tight. You can than also tighten them slightly if gasket gets old and seeps.
Last edited by Jackie Paper; Yesterday at 08:24 PM.
The call out for new bolts is for convenience to the mechanic at the dealership.
They come clean and usually with the correct dry coat encapsulated epoxy locking compound.
Clean threads with a die nut designed to around a GH5 size for cleaning and straighting a damaged thread. Not cutting. It's 0.0025 over basic.
I would definitely replace that.
I would like said replace fastner parts steel to steel on the engine.
As long as you clean properly and use correct locking compound as called out, fastners is aluminum can be reused. Don't use locking compound on maintenance covers with gaskets.
The gasket squeeze keeps them tight. And they will tend to stay tight. You can than also tighten them slightly if gasket gets old and seeps.
zfigoli. @zfigoliJust to add a little more and to clarify what I said.
My advice was for cut threads. That bolt has rolled threads. The thread diameter started as the slightly smaller diameter you see up near the head. Then the threads were created with thread formed hardened rollers. That process creates a stronger fastner than cut threads.
Basically a forging process.
After rolling, the majority diameter of the thread was just slightly larger than a cut thread would be but still in tolerance (cut threads have a slightly larger flat on the top of the V). Rolled threads are sharper at the top.
That's why your cutting die stock removed the black phosphate anti rust coating.
Only way really to clean rolled coated threads would be a fine soft brass brush.
You don't want to do that with critical engine fastners however.
The camshaft drive bolt final torque has been increased to
40 ft-lbs (54 Nˇm) for all Milwaukee-Eight and certain Twin
Cams models. See Vehicles Affected. This increase in
torque will make the bolt a one time use application. Never re-use a camshaft drive bolt for service after
tightening to the increased specification. See service
manual for updated procedure.
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