Oil Pump Shaft revisited, which would you use?

kopeck

Member
Sorry if I'm asking silly questions.

Just as a refresh, I bent my the shaft in my oil pump on my '47 A. I know what I did wrong, that's in the past now.

I did find a replacement but in the mean time I took my bent shaft and played with it on my press and more or less got it straightened out using a piece of plate glass and feeler gauges for reference (I don't have any v blocks).

Here's the deal. The replacement shaft it worn, .012 to be exact but is straight.

My original shaft isn't hardly worn at all, this engine really didn't have a log to hours on it. To bad the block cracked. Anyway, I was able to get it so a .002 feeler gauge wont pass under almost all of it. The exception is a 1 3/4" spot at the end (se photo below, the circled X is the high spot and the mark immediately to each side of the X are where the distance drops below .002") that's about .0035" (.004 drags) out at the highest point. I might be able to move it at bit more with the press but Im worried about hurting the surface. It slides into the housing and rotates with zero friction.

So which would you guys use? I'm kind of thinking either would work at this point. I'm leaning toward the original one that I fixed because of the lack of wear...

Thanks for bearing with me,

IMG_0231.jpg


K
 
Run the bent/straightened shaft. Keep an EYE on the oil pressure ! Use a smear of Vaseline on the gears to assist priming'
Jim
 
That shaft may never have been as straight as you
have gotten it! Use yours. It may be a gamble but I
would do it.
 
(quoted from post at 06:07:40 05/21/16) That shaft may never have been as straight as you
have gotten it! Use yours. It may be a gamble but I
would do it.

I've wondered if that might be the case, it took quite a lot of pressure to straighten it, more then I was using to press is part.

I'll keep the other as a spare and get that pump reassembled and back in the engine.

I think I over thing this stuff to much at times. Thanks everyone.

K
 
I'm with the others in that I would favor the original due to less wear.

Assemble it with the pump gears in the housing and then use spin it and see if the gear wobbles. Hold a straightedge across the gear end with a light on one end and your eye on the other and see if you have adequate clearance while rotating if it does wobble a tiny bit.

If you can manage to get a drill on the cam gear end and spin it that would be even better. You could feel for vibration in the housing caused by wobble.

As others have noted, factories often turn out things that are less than perfect.
 

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