Bearing Clearacnce
Posted: Fri Dec 10, 2004 7:50 pm
I have put together 6-7 CBX motors in the last few years. Usually I record the numbers from the crank and the end of the case, buy the bearings the book references for the corosponding number/letter and all is fine. Usually between 0.0015" and 0.0025" clearance. However, this time, all are very close to .003" which is the service limit.
Now for the questions. If it calls for a "A" (black) bearing, can I replace it with a "AA" (blue") bearing? Re-check and if clearance is now O.K. run it? Likewise, if it calls for a "C" (green) bearing can I use a "B" (brown) bearing to take up some of the clearance?
I have other cranks, should I just put in another crank? This is the crank that was in the motor when it last ran. Since it did not belong to me, I do not know if it had low oil pressure, the crank does look good. I am not very good at "miking" the journals but I will try.
Any and all opinions are welcome and needed.
Cheers, Tom
Now for the questions. If it calls for a "A" (black) bearing, can I replace it with a "AA" (blue") bearing? Re-check and if clearance is now O.K. run it? Likewise, if it calls for a "C" (green) bearing can I use a "B" (brown) bearing to take up some of the clearance?
I have other cranks, should I just put in another crank? This is the crank that was in the motor when it last ran. Since it did not belong to me, I do not know if it had low oil pressure, the crank does look good. I am not very good at "miking" the journals but I will try.
Any and all opinions are welcome and needed.
Cheers, Tom