Crank bolt to hold damper

JBurch said
A thought:
As I see it, the damper bolt is not the path of vibration to the damper; I see the path as:
1. interference fit between crank snout and ID of the hub
2. the hub being drawn up tight to the lower timing chain sprocket

A Helicoil, properly installed will not have a negative impact. The strength of all threads, of all nuts and bolts, has to do with the shear strength of the material they are cut into, the material of the Helicoil has a greater shear strength than the cast iron it's going into. So what's the problem?

Good thought now that you mention it, so thanks. I'd see the path as through both your number 2 above and the threads; any clamping force of the damper hub to the crank spocket comes only from the force generated in the threads and so both have to be in the vibration the path. I'd guess that you number 1 is not much of a path for vibration; it would eventually work loose if any vibration was present and is much lower than the other forces anyway.

And yes on the helicoil shear strength in steel and cast. Separate issue from vibration though. That is my concern. I've never done it so it may work... or may not.

RustyRatRod said
Are you makin that up as you go along? Pelosi needs you on the impeachment team.

LOL... well the crank vibration info is all over the www Rob. Look it up.