Re: More crank bearings

Posted by CNKS on January 12, 2005 at 07:15:08 from (204.249.178.138):

In Reply to: More crank bearings posted by CNKS on January 11, 2005 at 18:19:12:

Thanks for the responses. I am retired, have 2 acres and 6 tractors. I do this as a hobby, yes a very expensive hobby. The questions I asked were not to see what I could get by with and do a minimum job, but to increase my rather limited knowledge (as you can tell by the questions) about tractor engines. I know not to put standard bearings on a reground crank. The work, if any is required (apparantly there is) will be done by a machinist. I am merely trying to learn by asking questions. The two mains out of tolerance are the two center ones. The crank will be measured and checked for roundness. I will do that myself just out of curiosity, then let the machinist do it. I still don't understand why plastigage should not be used on old bearings, just as a ballpark measurment to determine wear, as long as the crank is still throughly inspected, and polished or ground whichever is needed, and the correct inserts installed later? Perhaps someone can answer that SPECIFIC question. Two other specific questions. When using plastigage, are the journals/bearings supposed to be lubricated or not? What I am currently doing is removing the bottom cap (the engine is upside down in a stand) wiping the oil off the top (bottom) of the journal and wiping the bearing. The connecting rod part of the bearing is untouched. Does this give an accurate reading? When installing the correct bearings on a properly prepared crankshaft, is lubrication needed? Again, with the engine upside down, and the bearing surface and journal where I put the plastigage clean, with the connecting rod surface clean, doesn't the correct torque push the crank into the unlubricated rod journal, and double the reading?? Or if I do lubricate the whole journal, how do I know I have the right amount, or does the excess lubricant get squeezed out when torqued? Sorry to prove my stupidity, but the consensus on this forum is that there are no dumb questions (although there may be dumb questioners).

Follow Ups:

• Re: More crank bearings scott#2 08:32:14 01/12/05 (1)
  • Re: More crank bearings CNKS 09:42:02 01/12/05 (0)

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