oil pump drive gears upgrade

[Omarttentmaker]

Looking to put the bigger oil pump drive gears in a '52 FL motor. H-D doesn't make them any more. Does anyone know an after-market manufacturer who does? I know they come as a pair, one that goes on the pinion shaft, and one that goes on the oil pump shaft that's in the timing cavity. Any help greatly appreciated.....Cheers.....Omar

[kitabel]

They're not bigger, they turn the pump faster.
IIRC S&S does

[Rubone]

The gears were never made for a splined shaft by H-D. They only made them from the early '70s up but due to the shaft design they fit back to '54 ( or earlier if the shaft, case race, pinion gear, rollers, etc were also changed). Splined versions were always aftermarket.

[Omarttentmaker]

Got it now. Saw the replacement stuff in the s&s catalog. thanks for the input.

[kitabel]

More information on oil pumps on my site: http://victorylibrary.com/tech/OHV-pump.htm

[Omarttentmaker]

Hey, kitabel, who is IIRC? Bought the upgrade oil pump drive gears from S&S, and the one that goes on the pinion shaft is too small to fit on the shaft. From what I can measure, the shaft is .848" over the splines, but the gear is .843" (.005" interference!!!!) Typed in IIRC to do an internet search and didn't get anything m/c related.

[Rubone]

Hey, kitabel, who is IIRC? Bought the upgrade oil pump drive gears from S&S, and the one that goes on the pinion shaft is too small to fit on the shaft. From what I can measure, the shaft is .848" over the splines, but the gear is .843" (.005" interference!!!!) Typed in IIRC to do an internet search and didn't get anything m/c related.

IIRC is a slang acronym for "if I recall correctly".

[kitabel]

This is the first I've heard of S&S having a "JIM'S" problem (looks good, can't fit w/o major work).
Is S&S now pronounced "Beijing"?

[Omarttentmaker]

LOL. I'm not all that hip to internet jargon!

[Omarttentmaker]

Talked to the shop I bought the parts from. He said he'd contact s&s tomorrow. I told him to send the pics of the measurements I took. I doubt it'll do any good. Will keep everybody posted on this snafu.

[Omarttentmaker]

I have been enlightened by the panhead manual. On page 170 there is information re/ an upgraded pinion shaft that was introduced in late '51. This shaft is larger in diameter so that the pinion gear is a press fit on the shaft. The press can be up to .002", according to what I read. That means that the inner splines on the oil gear that goes on the shaft would have to be bigger, as I am sure that it is not a press fit. A special tool is required to remove and install the pinion gear, but no mention is made of the oil pump drive gear. I know this is the upgraded pinion shaft because it has a screw in its end. So when s&s advertises the oil pump drive gear update, it's actually misleading. It should read '39- late '51. The gear for those models will not fit on late '51-'53 motors. Of course, my confusion is only compounded by the fact that the pinion gear that came off is a slip fit on the shaft. Don't know if that's due to wear, or if somewhere along the way it was reworked to be a slip fit on the upgraded shaft. FYI.