Posted by Owen Aaland on July 10, 2011 at 13:33:31 from (216.47.33.237):
In Reply to: A Picture of my woes posted by Allan In NE on July 10, 2011 at 11:14:58:
The groove you see is in the tappet, designed to keep it square with the cam shaft in the pump. The missing pin is a press fit in the pump housing. I do not think that there is any seal other than the fit of the pin in the housing.
Without the guide pin the tappet is going to turn slightly which can cause timing to advance a little, but more important will be the roller under the tappet will contact the cam on one end instead of full contact over the total length. If run long enough without the pin it will damage the cam,roller, and tappet.
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