Crankshaft Alignment to Block

[tennsmith]

Originally Posted by Kohnke Rebabbitting

Never shim a flywheel housing on any of the set of 4 bolts that hold it to the block.

All shimming is done on the two ears at the top of the housing.

You do it in two steps,

1. Shim the two ears so 9:00 and 3:00 will read the same, shim stacks will not be the same on either ear. Use what ever it takes for thickness, but you will need .002, and even .001 thousandths shims.

2. Now do the top and bottom, or 6:00, and 12:00. You will add shims, or take out shims, but they should always be the same thickness, weather it is .010, or .001 thousandths, on either bolt.

Now, leave the thing set for 24 hours to see if the flywheel housing will change, and if it does, and most likely will, then adjust again.

What you are trying to do here is get 4 points on the flywheel housing for the transmission to bolt up square, so the main shaft does not bind, and take out the rear main, among other things.

Nothing To it.

Herm.

Herm, you are going to have to explain to me how shimming the ears at the top of the housing will have any effect at all on the 9 and 3 O'clock positions. I can understand how I can align 12 O'clock with either the nine or the three, but at 9 and 3, I still have a difference of 0.010" and the housing is hard-mounted to the block at those two points. What am I missing?