#3 Bottom End Bearing Failure

Arthur Robinson art.robinson at rogers.com
Tue Jul 28 07:55:50 PDT 2009

I heard something interesting from a Kawi mechanic regarding the failure
of the #3 bottom end bearing.

According to him (and he speaks with a great deal of authority) the
bearing failure has nothing to do with lubrication, but is a
manufacturing defect.

The drilling of the oilway in that area of the crank shaft consists of
two holes which intersect. One of the holes was drilled too deep
resulting in a "cul-de-sac", which can harbour chips from the drilling
operation. It's possible that chips left there are not flushed out in
the washing operation. 

As long as they stay there everything is OK, but if for some reason they
become dislodged they can enter the bearing and..... Bye-bye!!


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