258 Main Bearing Trouble - JeepForum.com
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post #1 of 2 Old 08-05-2012, 09:14 PM Thread Starter
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1981 CJ7 
Join Date: Dec 2011
Location: Clyde
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258 Main Bearing Trouble


I decided to replace the main bearing set in my 81 258 while I had the engine out and the oilpan off. My problem is this, I have the engine with combo standard and .001 bearings. I cannot find the .001 bearings anywhere! What have you guys done in the past to fix this problem?


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post #2 of 2 Old 08-06-2012, 09:06 PM
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1971 CJ5 
Join Date: Jan 2002
Location: Eagle Point
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Two options come to mind given you can't find the proper bearing size.
If the crank is .001 under (bearing .001 thicker then stock), you may be able to use a standard set of bearings and shim the cap bearing with paper. Newspaper is app .003 thick, while an electronic receipt is about .002. Cut the paper about 3/4 the length of the bearing half and place it under the cap bearing, being sure it doesn't get under the lock tang. Plasticgage the bearing to insure you have enough clearance. I know it sounds like THE most redneck thing ever, but I have seen it done a couple of times and it worked (Jeeze, I flinch even mentioning it here).
The other (better) option is to replace the crank with a .010/.010 grind. This will standardize your mains and rods. this fix will, however, be a bit more entailed.
Remember to check the clearances on the new crank as well.
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.001 , 258 , bearing , main , standard

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