Re: Re: Re: Shimming Rod Bearing?
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Posted by Ken McWilliams on September 01, 1998 at 19:26:47:
In Reply to: Re: Re: Shimming Rod Bearing? posted by Tyler on September 01, 1998 at 15:27:21:
Tyler, If it's a removable bearing, then, it's not babbit, but it's known as an inserted bearing. As I wrote before, the coating on the bearing is thin and is back-up with steel. If you shim the bearing, you may very well go beyond the wearable coating and cause the steel backing to rub the crankshaft journal. I wouldn't stop searching for a bearing until all sources are exhausted. Post again giving the engine brand and model. Someone may have a source for this engine or even an interchangeable part from another engine that will fit it. If you have a knock, use a micrometer and measure the journal diameter in several places. Chances are that if its knocking, then, it knocked before tearing down and the journal is no longer concentric. BE CAREFUL. You can create more damage with a tight bearing riding on an out of round journal. Good luck! Ken McWilliams
Dayton, OHio
: : Tyler,
: : In the old days the rod bearings were babbit. The babbit material was cast into the rod and could be recast when reconditioning. The bearing inserts used in rods and main bearings today are very precision to assure proper oil flow and dimensional control. The insert bearings are laminated with a soft material on the surface to act as a sacrificial material which will wear before the crankshaft or camshaft. If you shim a worn bearing, you may expose the harder layers of the laminate which will ruin the bearing journals. : : The replaceable bearings are too cheap to risk ruining a good bearing journal on a crankshaft. I would not recommend that you attempt to file the bearing caps. It was good for model T's with babitted bearings in the depression, but not for today's engines. Don't do it. : : Ken McWilliams
: : Dayton, Ohio
: : : I read somewhere that you can snug up a loose bearing, by filing the opposite
: : : sides of the bearing and putting shim stock of the right thickness behind the bearing.
: : : Has anyone heard or done this? : This is a old style motor that has the babbited bearing. The trouble is that under sized bearing are not avalable for this motor. and only one journal is under sized. I replace the bearing and there is a slite knock. that I would like to remove. Would shimming help this. I also would not file the bearing cap only the bearing itself.
: To shorten its radius and give room for the shim stock under it. I also would drill the oil hole in the shim stock to maych the bearing.
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