some of y'all showed interest above about the Sumping problem
here is some info and photos of a recent check ball seat clean-up
friend has the sumping problem on his Shovelhead
he just installed a New S&S oil pump (well NEW does not mean perfect)
he says, "Actually leakage is worse than in the old pump"
I took the pump off and disassembled, here's what I found
and how i cured the problem
photo of the check ball seat, at 10 o'clock you can see a cut going into the seat (the inner black ring is the ball seat, It shows up as black since its angle is different)
So, took old Evo pushrod (the end ball measures .33 same as the check ball) and lapped out the seat with 330 grit lapping compound. which made it a little better
well i got tired of doing this by hand and not getting the results i was looking for
so
i put the pushrod in a drill and with more lapping compound and a little more time it now looks good
much better than the 1st photo
and
after testing before install showed no leak
as I said above this is a New pump
it could have been sent back to S&S for a replacement
but
with this Great riding weather who wants to wait 2 weeks, when i can fix it in 1/2 a day
here is some info and photos of a recent check ball seat clean-up
friend has the sumping problem on his Shovelhead
he just installed a New S&S oil pump (well NEW does not mean perfect)
he says, "Actually leakage is worse than in the old pump"
I took the pump off and disassembled, here's what I found
and how i cured the problem
photo of the check ball seat, at 10 o'clock you can see a cut going into the seat (the inner black ring is the ball seat, It shows up as black since its angle is different)
So, took old Evo pushrod (the end ball measures .33 same as the check ball) and lapped out the seat with 330 grit lapping compound. which made it a little better
well i got tired of doing this by hand and not getting the results i was looking for
so
i put the pushrod in a drill and with more lapping compound and a little more time it now looks good
much better than the 1st photo
and
after testing before install showed no leak
as I said above this is a New pump
it could have been sent back to S&S for a replacement
but
with this Great riding weather who wants to wait 2 weeks, when i can fix it in 1/2 a day