[Mark R]

Originally Posted by Gunkk

The two failure modes I know about are:
1. Crack at the ring pivot pin, resulting in loss of pumping pressure.
2. Failure of the timing chain tensioner spring, resulting in a rub-through of the outer housing of the pump, resulting in loss of pressure.

I think you are the only one talking about the cam chain tensioner here. All the failures I remember on this thread were just the pump internals cracking and causing subsequent chaos.