Just thought I'd post a couple pics of the main bearing I recently turned for my caterpillars pony motor. The blank was cast out of aluminum pistons, I read that they were a suitable alloy for this application. Guess I'll see how it works, new bearings were over $100 apiece from cat so I thought it'd be worth a try. I turned down the crank and polished it with three grades of emery then made the bearing .005 over that as this little motor doesn't have pressure lubrication .
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main bearing for D7 pony
- Thread starter mce5802
- Start date
- Joined
- Mar 5, 2012
- Messages
- 314
alum should be fine for the starter motor
pictures will help:nervous:
pictures will help:nervous:
The k&t worked perfect for locating and drilling the oil hole which has a tube through it that keeps the bearing from turning. Cut a groove both ways from the hole with a chisel I ground from an old punch..quicker than setting it up in the shaper as the grooves don't go all the way across the bearing
- Joined
- Jan 23, 2012
- Messages
- 1,216
i don't know why it shouldn't work. there are lots of small engines without inserts. i did the same thing on a 5 hp compressor pump, i had to have the crank turned down and there were no undersized bearings to be had anywhere. this was a rod bearing. . .
good job.
good job.