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Allis Chalmers Discussion Forum

Question on Mains on B

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01-23-2008 12:58:19

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I was looking at the mains on the crank on my Model B and they measure according to the manual.
My7 question is how whould they look before any resurfacing on the crankshaft is needed? And, if they DO need to be reground do you go over ONLY in .010 and .020 increments OVER what the book says?
thank You

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01-23-2008 18:56:33

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 Re: Question on Mains on B in reply to loveshisallis, 01-23-2008 12:58:19  
you should have 3-4 small shims between the bolt faces on the main and rod caps. the shims are about 1.5 - 2 mills thick so a total of .005 -.006 gap. AS Dick said, if the crank is 2-3 undersize and still basically round, you can remove some shims and still keep your .002 clearance between teh bearings and journals. if the crank is worn .005 you would have trouble shimming to get proper clearances. then you need to grind and put in oversize bearings.

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Dick L

01-23-2008 17:01:56

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 Re: Question on Mains on B in reply to loveshisallis, 01-23-2008 12:58:19  
And what is that measurement? I dont think I have ever measured a crankshaft that old that was on new spec. If they are .002 so under and not out of round more than .0005 they will work on standard bearings. Bearings are .010 -.020 -.030 for the most part and crankshafts have to be ground on a crankshaft grinding machine to the correct bearing size. No way your eyes can tell anything about the condition of the crankshaft unless it is bad so you can see that it is grooved, pitted or rusted. You need to mic the journals in three or four positions to tell if they are out of round and on both sides of the center of the jurnals.

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01-25-2008 09:38:43

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 Re: Question on Mains on B in reply to Dick L, 01-23-2008 17:01:56  
dick l;

Book says journal diameter 2.249" - 2.250" and what I measured was a 2.250, so I would think that is a good number.

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