Main and Rod Shim Sequence ???

[Patrick L.]

Originally Posted by Kohnke Rebabbitting

What the reference is to, the middle main, as most know, the hanging weight of the flywheel, causes the the crank to bowed, center bearing up, and rear bearing down.

In a center bearing, you can find .003, to .020, or burned out.

So, if the front is wore .004, and the rear is say wore .006, and the center wore .010, and you adjust all to .001-50, T

That would be No. 1 tightening of 002-50.

No. 2. would be .008-50.

No. 3. would be .004-50.

So when adjusted, to .001-50 thousandths, you have a bow in the crank, and when it runs, it will flex, which is a good way to break, a crank, and will have a vibration.

The other thing that happens, is the off center main will eat the bearing out until the pressure gets off the cranks center main bearing, from the bow, held in the bearings, after adjustment.

Herm.

I'm not quite sure what you're saying, but, thats OK. I guess we can maybe agree to disagree. I certainly don't do this as often as you, but I haven't ruined a bearing or crank yet. [ for whatever thats worth].

I like the bearings [ rods and mains] at .0015" [ no more than .002"] with each side of the shim pack equal thickness.