D2 Bearing wall thickness

Seems nobody is jumping on this and I have an idea why. I don't know if I can be of much help, but I'll give it a try.

I just went through all this same mess--bearing shell specs, used bearings, rusty journals, water damage on mains, you name it.

The machine shop I deal with has that shell dimension for just about every engine except Cat. They seem to be a breed apart with their aluminum alloy inserts. The Cat shop manual gives journal size and new-bearing clearance. All I can suggest is inside mike the big end or the main boss and do the math.

If your bearing shells are +0.010 on an used shaft, you're going to have a problem, or pretty close to it. If you are going to grind, you need undersize bearings and I sincerely wish you luck.

Check out my ongoing thread, early pages: assembly of a D2 5U engine and look for responses by timbo46. He just did the main & rod bearing job, had some manufactured. There was also a response from someone who had a set of J series undersize bearings, same as a R2 set I am told.

Yes, the J series is different, just the problems of supply are pretty much the same.

Jack

I did find the rod bearing size but have not quite yet been able to locate the main bearing size. the wall thickness for the rod bearings would be .162 for a std bearing. I will keep looking and I may be able to find the size of the mains.
Mike Mahler
Vintage Engine Machine Shop.

Cheers for the response guys, have checked out the D25U engine rebuild posts and there is some usefull stuff on there. Anyway looks like I am sorted now as we have done all the measuring and the maths and I have a standard crank, a set of -0.020" mains and a set of - 0.025" big end shells so its off to the grinders now.