(quoted from post at 23:22:23 10/15/17)
(quoted from post at 23:05:41 10/15/17)
(quoted from post at 21:51:39 10/15/17)
(quoted from post at 21:37:08 10/15/17)
(quoted from post at 21:07:33 10/15/17) Cowdog/Roger, thank you both.
I'd take it back apart and plastigauge it, but then I'd have
to clean off all that RTV I used to seal it... JUST KIDDING!!
I have .005 longitudinal play with the gasket installed.
Easy enough to pull the cover and gasket back off and check.
Sounds like it's pretty darn close though. Good to know.
When I install the new drive gear I press it on such that there is no measurable end play and the gear spins with no signs of drag. End clearance of .001/.003 between gear and cover would be ideal. In my experience good gears are dead flush with the surface of a good housing and the gasket is what produces the clearance. In a gear pump end clearance is a a primary source of "slip" and if excessive will most definitely affect pressure and volume. Ideal tip clearance is about the same.
Per the industrial engine shop manual running clearance on the shaft should be .001/.0015. New shafts consistently measure .0005/.001 under the 9/16 nominal size and I use a standard (.000/.0005 over) reamer. That usually comes out pretty tight.
TOH
Thanks TOH. Another thought came to me. How much longitudinal movement should there be without the cover on, drive gears both in place?
I interpret "longitudinal" to mean end play and I assemble them by pressing the gear on enough there is no end play. If you mean backlash the call out on the factory prints was .003/.006. I assume that specification was meant to be clearance normal to the tooth as measured with a feeler gauge.
TOH
Longitudinal meaning in the direction of the length of the shaft.
I have the internal pump drive gear installed and the external
drive gear installed on the opposite end of the same shaft.
I'm wondering how much the shaft should move in and out lengthwise.
No tooth mesh or backlash involved in this measurement as it
is more end play as you termed it. Not rotational at all.
Same measurement I was making with the cover installed as well.
The reason for concern were the rub marks on the cover.
Seems like there should have been a small clearance there.
As others have said, .001 to .003. Not rubbing. No?