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Re: Crank bearings
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Posted by captaink on January 11, 2005 at 10:55:14 from (66.115.214.56):
In Reply to: Crank bearings posted by CNKS on January 11, 2005 at 10:00:41:
Answer to # 1. If the crankshaft is within tolerance when measured with a micrometer, and it is smooth without grooves or dings in it, it is fine to put in new bearings. When you measure with the micrometer, you will then know if you need standard, 0.001, 0.002 or 0.003 undersize bearings. More than that, and you should consider grinding the shaft. You can not tell if a crankshaft is good by using plasti-guage with an old bearing. The old bearing may be worn which will throw off the reading. Plasti-guage is only useful with new bearings to check to make sure you have the correct clearance between the shaft and the bearing. Answer to #2. See plastiguage comment in #1. Old bearings probably are worn and will not give a reliable reading on the crankshaft. Only a measurement with a micrometer will give you an accurate story. When in doubt, take the crank out and take it to a machine shop and have them measure it. Work bearings or worn journals on the crankshaft will allow excess oil to escape and lower your oil pressure. While it is true that the engine ran with wear in it, you obviously took it apart for some reason, and are concerned about rebuilding it correctly. You need to decide how deep your pocket book is compared to what and how much the tractor will be used to see if spending the money is justified.
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