Quote:
Originally Posted by Smallblock454
Hm, looks like something hard did get sucked through the scavenger pump. Doesn't look like a normal wear pattern. That could have blocked the pump and things happened. The question is what got sucked into the pump? In my opinion, it must have been something hard like metal.
The IMS bearing is completely intact? No single bearing ball is missing?
Were you able to identify where the metal parts in post #4 came from?
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Exactly, something got jammed in between the rotor and the pump housing. It's kind of visible if you look at the picture carefully. It's not there anymore. But clearly, that's what seized up the camshaft and consequenly snapped the chain.
IMSB is in perfect condition. A ball couldn't just escape without ripping the whole thing apart. Those metal parts in the sump are remnants of the chain rollers.