'47 Chief Oil Pump Base surfacing

[Cossack_38]

I have been told that I need to surface grind the base of the oil pump to remove all traces of wear from where the scavenge gears ride. I then shim the gears with a .002" and/or .004" gasket, just enough to eliminate binding.

I am wondering if this means simply removing the light scoring where the right (driven) gear rides in these pics (this will only require removing another .002" or so), or whether I need to also eliminate the grooves at the outer diameter of both gears (which would require maybe .020").


I can't tell if the grooves at the outer diameter are intentional. Expert opinions?

[indianut]

No, the grooves are not intentional. I would remove them. The part is just a Cap and it will not effect it at all to grind it untill it is smooth. I usually clamp it in my Grinding Vise with soft wood strips on the sides so it will chuck up tight. Then just indicate it Flat and Grind!

[Cossack_38]

Thanks, Indianut! I will grind it smooth. I really appreciate the expert opinions on this forum.