Thread: Loose Rod
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Old 04-02-2020, 07:55 AM   #34
CT Jack
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Join Date: May 2010
Location: Hebron, CT
Posts: 432
Default Re: Loose Rod

Jack Shaft is right on. It seems like someone doesn't know how to use measuring gauges or measure. The crank journals should all be the same dimension within +/-.0003". The rod inserts should all be machined the same and mated to the crank approx. +.0015" according to Jack Shaft. It would seem to me that if the above has been applied you should be able to install a rod in any position blindfolded and have the same results.
Torquing is not the solution. If the crank journals are not all the same have your machinist make them all the same. Then buy new rods that are properly mated to the new crank journal dimension or re-machine the inserted rods you have to properly fit the crank. This would probably involve removing material from the caps and reboring the inserts to the new crank diameter + some clearance (use Jack Shafts spec).
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