I am in the process of rebuilding some oil pumps. Here’s a pic of six that I have. The top row is from diecast engines and the bottom row is from sandcast engines. The one on the lower right is from E100. I didn’t see a thread about this so before I started taking them apart I carefully looked them over and made some interesting observations. There are four different versions that I see. I’ll call them early sandcast (E100), later sandcast (E1490 & E1789), early diecast and later diecast.
The early sandcast pump has “8” bolts on the oil stopper valve cap, the others do not.
Both early and later sandcast pumps (like the one on the left) have a rougher sandcast-like finish than the diecast versions, especially on the right and left end plates.
This view shows a plug that is on all pumps except the later diecast (shown on the right).
This picture shows a later diecast on the left, early diecast in the middle and a sandcast on the right. Notice the lack of a plug in the upper right area of the later diecast pump and the cover is different.
There is a difference in the casting of the later diecast (on left). All the others are like the pump on the right.
I saved the best for last. The early sandcast pump (on the right) has a relief valve cap that is tapered down from the hex. All others are just flat. I definitely have to save that piece.
« Last Edit: November 04, 2013, 10:29:05 am by markb »
Mark B1969 CB750 sandcast #97 restored - Sold
Restoration thread link1969 CB750 sandcaxt #576 - Sold
1969 CB750 sandcast #1553 - Sold
1969 CB750 sandcast #1990 - Sold
1969 CB750 sandcast #5383 restored - Sold
Restoration thread link1970 CB750 K0 restored - Sold
2010 H-D Tri Glide Ultra Classic (Huh?)