I don't know about the collar but if the oil pump slot is at ninety degrees to your shaft, it won't go down. Sometimes you have to rotate the pump a bit with a screw driver.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!