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Main bolt torque/crank issue


Lee Cobb
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Evening all,

   We are in the middle of rebuilding a 1940 248 engine and come upon a interesting issue. According to Motors Auto Repair Manual the bolts for the main bearings are supposed to be torqued to 90-100 Ft. Lbs. The issue is that once we hit about 55 Ft Lbs we can no longer turn the shaft. Standard bearings and crank are .010 over and are smooth as silk up to that torque. Anyone have any input?

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Allow me to restate: The crank was ground to .010 and the bearings were replaced with .010 bearings. We do have the original shims, but at this moment none are being used. Does anyone have any documentation on those and placement?

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16 minutes ago, Lee Cobb said:

We do have the original shims, but at this moment none are being used. 

 

Mine had 4 shims on each bolt and plastigaged down to 3 on some bolts and all 4 on the others, never 2, so if you have taken all your shims out I'm guessing you need to put most of them back.

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