|36F30 said: Bearing crush? on a babbit bearing? |
Yes, F20 con rod bearings are replaceable insert bearings. Brass backed with babbitt wear surface.
Bruce, while I don't know the figure you are looking for, it can be calculated. You have the rod cap which is an arc of the original circle. Using the width and height of the arc, the diameter of the circle it came from can be calculated.
Another option is to file the ends of the bearing insert until it matches the rod cap. I had to do that to one replacement bearing insert on the 10-20 I am rebuilding. Remember it is a low speed engine and very forgiving. When I got my 22-36, I checked it's rod bearings and removed shims to tighten clearances. I measured the crankshaft journals while I had it apart and found them to be .005-.010 out of round. I just removed as much shims as I could that still allowed the engine to rotate freely. It runs just fine and does not knock. This post was edited by Nebraska Kirk at 20:06:51 03/01/13.