Posted by Owen Aaland on July 10, 2011 at 22:52:38 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:
There is just a straight roller that fits in the bottom of the tappet and rides on the cam. The guide pin is there to keep the tappet from turning so the roller has full contact with the cam. The push rod that sits on the top of the cam is actually the high pressure pump plunger/piston and is turning at 1/2 engine speed. There is a convex button between the tappet and the plunger that serves to insure that there are not any side forces transmitted to the pump head and also by varying the thickness serves as a way to adjust the internal timing. Because the plunger is turning there is some rotational force transmitted back down to the plunger. This may tend to cause the roller to not stay parallel with the cam. But like Pete posted earlier, if you did nothing but seal up the hole it may outlast all of us!
I don't have any old housing laying around here or I would send you a pin. Usually have to change the housing when the head gets loose and causes wear. Too much wear and they won't stay tight and the lower seal will leak fuel into the oil.
If when you have pump problems you are just going to exchange pumps I would probably just seal it up and see what happens. If it does take the cam and roller out you will notice a loss of power since the plunger will move up a little late retarding the timing and when you lose stroke you will get less fuel delivery.
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