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Old 08-29-2013, 09:15 PM   #6
MEXJOE
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Default Re: BBC broken crankshaft

It did rip one wrist pin out of the piston. What happened first I don't know.
I just thought it was from the crank exiting with the 5/6 rods in such a quick fashion?

Quote:
Originally Posted by Alan Roehrich View Post
If it pulled a rod journal/throw out of the crank, suspect a piston/wrist pin problem.

Most often, a crank breaks at the front of #1 journal or the rear of #8 journal if the crank itself is the root cause of the failure. If it breaks at #1, the balancer could be the problem, at #8 the problem is load or fatigue.

About 9 out of 10 times I see a rod throw broken out of a crank, I see a wrist pin or maybe piston problem.
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