1949 77 crank/rod questions

1950gm · Mar 12, 2009

I am working on a 49 model 77RC, and upon dissasembly found that the rods have shims in them? Why would there be shims in a non-adjustable insert-type bearing? Also what should the rod journal diameter be on the crank? It appears to be 1.995" instead of the normal 2"...

Anonymous-0 · Mar 12, 2009

Well the idea of the shim was if the bearings wore a little bit you could remove a shim and be good to go. This was so they could be done in the field. I had a Waukesha engineer that was assigned to Oliver explain that. Then when the diesel was introduced, bearing materials had to change + they had problems with the shims causing failures. End of shims. If you are redoing the engine and installing new pin bushings take the shims out, take the rods to a machine shop and then have big end fit. Explain that it had shims and you took them out and the machine shop will not need to cut the caps first (see if you can get a discount that way) My F-M bearing book lists shaft diameter at 1.999. I did not check my Oliver shop manual. By the way what is the rod forging number. Hope this helps. More questions? J.

1950gm · Mar 13, 2009

The # on the rods is 180007B. Bearing insert # is cgb160010-a

I'd seen shims before in the old farmalls, but never in a later style engine with replaceable shell-type bearing inserts. Also the main bearings appear to be this same style setup.. Is this a weakness that should be updated while I'm into the engine? My book also showed the journal diameter to be 1.999-2.000, but I thought it odd that all the journals would be worn to exactly 1.995.....Thanks for the advice, J.W.

1949 77 crank/rod questions

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