quote:Originally posted by George P:
This is what it takes to snap the OEM oil pump shaft.
The cool part of this story is that the roll pin never sheared while this shaft was slowly twisting over years and miles of operation.
A burr inside a replacement oil pump is what caused this problem; this is why it is necessary to disassemble new oil pumps, deburr them, and clean them prior to installation.
i'll suggest that the burr found in the pump was evidence of debris that stopped the pump at rpm. possible the debris made for the shadows and was never found but that what happens when the engine is chooching when the oil pump stops
still always good advice to inspect deburr & clean new pumps before putting them into service, how many times have you read a thread about a new build only has pressure cold & fades quickly during warm-up?
the relief valve in the new pump is stuck open on trash