Oil pump gears modification

[Devonrod]

Found a picture of a gear mod by drilling small countersinks in the bottom of the oil pump gears, I am installing new gears in a SD1 front cover, any thought on this mod please ?

[stevieturbo]

why on earth ?

[ChrisJC]

Must admit, I wondered what the point was!

Chris.

[DaveEFI]

If you look at an old bottom plate, it is often scratched. Perhaps an attempt to prevent this? Not sure whether it would make any difference, though.

[Devonrod]

I forget where I got this from, I guess the idea is oil gets trapped in the countersunk bits and is more of a cushion of oil underneath the gears ?

[ChrisJC]

I think you always have an oil cushion otherwise the end would wear away real fast.

I suspect the scoring is causes by tiny occasional bits of crud in the oil that have yet to be filtered out.

Chris.

[ged]