Quote:
Originally Posted by Russell James
The pin is load bearing. Just not intended to be the main load bearing factor. It's just like a crank pin/key for a balancer. It locates the balancer in it's exact spot and supplies some locking mechanism to prevent it from moving out of position - but the balancer bolt is the main clamping force securing it.
The cam pin locates the cam and provides a lock to prevent it from turning, but the bolt is the main player in the clamping force torquing the gear flatly to the cam.
Think of the pin as like a lock. You've got bolt torque and a lock. You can't rely on just the lock, it will fatigue over time if the bolt torque isn't solidly clamping the gear to the cam.
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Okay that makes sense....so let me ask this. It would seems as though this failure has been caused by improper torque to the camshaft bolt. Is it possible over time as the bolt got looser that the cam timing changed ever so slightly?
I only ask this because the more I look at the pistons, I'm questioning if the valve marks on the pistons were caused over time or are the result of the failure at a high RPM.