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Old 10-17-2010, 07:31 AM   #1
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Default ninja crankshaft

i wonder what cause this engine to broke the front crankshaft near the centex clutch?here the pic of it..anyone know what cause this?
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Old 10-18-2010, 05:47 PM   #2
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Originally Posted by g-wan View Post
i wonder what cause this engine to broke the front crankshaft near the centex clutch?here the pic of it..anyone know what cause this?
Damn! Never seen anything like that. Looks like the break happen where the thread ends. Could be just a weak part of the shaft.
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Old 10-18-2010, 05:56 PM   #3
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I only see two ways to break it there.

1. Over tightening of the nut (we're talking impact gun levels of torque).

2. Manufacturing defect (micro-fractures in the metal).

There are other things that could break a crank like a badly out of balance flywheel/clutch assembly but I would expect it to break in a different place for that.
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Old 10-18-2010, 10:49 PM   #4
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I once broke a crank shaft like that, the engine slipped out of my hands and landed right on the shaft
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Old 10-19-2010, 02:49 AM   #5
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thanks guys for helping out here..i just totally blank when this happen..but this my 2nd engine that broke crankshaft..the 1st one i broke the middle @ the intake last year..now my ninja..is nova crankshaft can fit on ninja block?since i just replace my front and rear bearing with ceramic so i try to find what crank can be fitted in it..
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