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Allis Chalmers Discussion Forum
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Engine knock in a C

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Wil

06-05-2005 14:04:16




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I have a 1941 C that has a slight knock in the engine. So today I dropped the oil pan to check out the crank bearings etc. There is no up and down play in any of the piston rods on the crank or up in the pistons but there is some noticeable side to side play on the crank shaft. # 2 seems to be the worse and I suspect where the knock is coming from. Does this mean I just need to re-shim or put crank bearings in? Oil pan was not that full of sledge like I thought it might be.

Thanks,

Wil

Wil

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Eddie H.

06-05-2005 18:50:06




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 Re: Engine knock in a C in reply to Wil , 06-05-2005 14:04:16  
there should be some side clearence in the rods



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Side clearence!!!

06-07-2005 07:00:37




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 Re: Engine knock in a C in reply to Eddie H., 06-05-2005 18:50:06  
Define what you mean by side clearence!!!



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Eddie H.

06-07-2005 07:27:56




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 Re: Engine knock in a C in reply to Side clearence!!!, 06-07-2005 07:00:37  
the width of the big end of the rod in relationship to the width of the journal...this dimension is important , but not as critical as inside dia. of the bearing to the O.D. dia. of the journal....."Rod Side clearence" is a common term to engine builders



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Texas Denny

06-05-2005 14:36:53




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 Re: Engine knock in a C in reply to Wil , 06-05-2005 14:04:16  
I'd get plasti-gauge and check all of the bearings. When you have the bearing off that you question, compare it to the others (don't mix them up and mark them before removing so you can get them back in correctly). If all of the babitt is gone, it will need to be replaced. If the crank is in good shape, you might get by without regrinding it. If all the bearings look the same, try shimming them. If they all come in, you might not need to do anything.

If you can feel slop in any direction, I would expect that bearing to be beyond shimming.

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