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Reply to "Tapping sound at bottom of oil pan"

Okay, that didn't yield much, the drive shaft dropped out and went to the bottom of the pan, I have to assume it's in one piece. The filter screen is clean. No way to remove the entire pump. I have good oil pressure, so curiosity satisfied.

How does an oil pump work anyway, does it pulse like the timing of the motor? The pickup filter is on a threaded pipe, and I can swivel it, but can't remove. It rest's inside that large upper floor hole. If it was resting on the side of the hole, might it make a tapping sound?
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