Oil Pump Driveshaft Wear

This is the shaft in question, by the way: http://chucker54.stores.yahoo.net/stoilpudras1.html

What is this collar everyone is talking about? I've never heard of this.

My gues would be that something dosent line up corekly ! Remember that the oil presiure is not indication of what the load is in the gear but is your oilpump a hv ? almost al i read on oil presiure seams to end up whit speculations but i will never put a hv pump in a bb ever again whit half grove main bearings ! I run a 500+ stroker on a rb block and use a stv mellings pump on 10W40 mineral oil and presiure is never under 35psi at idel and it regulates on about 1300rpm on a REALY hot day at about 55psi ! Its not the presiure that protect the bearings and im of the belefe that whit a hv pump you will harm the internal parts even more before you see any change in presiure and why use up hp to pull a to large pump when you dont need one !? Pleas i dont whant to argue this and im no experts but this works fine on my engine and it shore saves the bronze gear i have to use whit the roller cam i have in the engine

I shorely doubt that thas wear pattern on the gear have to do whit it moveing up and down but the collar is used for keeping the gear in place to avoid ignition walks so that will be steady at al rpm´s ! I would ask a guy that works on rear ends what that would cause this pattern. Some thing must be cut wrong or out of line !!! Is there any wear in the bushing hole that is in the block ? Many just drive that bushing in the block and forget to see to that there is the corekt zice for the shaft and if its to tight it will wear hard on the shaft.
Could the camshaft for some resone be to far in to the block ? Just a gues but mabe a good one for that kind of pattern `!?

If the slot is too deep in the drive gear there is nothing to stop it from floating up and down. Not only will your timing bounce around it will cause unusual wear to the gear. Here's a few pic to show how much it will move.

Gear seated...


With the distributor seated I pushed up on the hex where it engages in the oil pump with the pump off.

Here's a pic of the clamp collar.


I have a pic of the wear on my gear when it was bouncing but it's so out of focus you can't tell from the pic.

Hope that helps.

Gotcha! I will be buying one now. Who sells them?

Any chance this is common with the MSD Pro Billets?

It's not the distributor, it's the depth of the slot in the pump drive. Same issue with my NRC offset distributor.

Gotcha, what will they call it at the hardware store?

I always just called them a "Clamp Collar"