Replacing pin drive oil pump in my S engine. The new pump is Mini Spares C-AEG410 which has four bolt holes. The old pump was a three bolt HE type pump (Birmingham 5367-C stamped on the body) and the bolts were secured with a half moon all in one lock washer.

The body on the old pump was slightly wider than the MS one meaning the old bolts are too long and bottom out. I can cut the old bolts down a bit to overcome this, but the old lock washer won't fit of course. Did the four bolt pumps use spring washers under the bolt heads? no washers? or was there a special all in one lock washer set up for this pump too?

_________________
Slide
1965 Mini Van (1360)
1970 Mk2 Cooper S (1310)
1978 Rover SD1 V8 (4.6)
1996 Land Rover Discovery V8 (4.0)

Fit new spring washers and shorten the bolts.
For peace of mind you could Loctite the threads but I've never had them come loose.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks Doc, I didn't think there was a continuous lock tab washer for the 4 bolt pumps.

_________________
Slide
1965 Mini Van (1360)
1970 Mk2 Cooper S (1310)
1978 Rover SD1 V8 (4.6)
1996 Land Rover Discovery V8 (4.0)