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Lapping the mounting face of a A65 oil pump? #692552
04/20/17 9:38 pm
04/20/17 9:38 pm
Joined: Sep 2011
Posts: 185
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jhays79 Offline OP
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Ok, I made the mistake of opening up my oil pump only to have it bind when re-assembled. I spent quite a few hours lapping each gear by hand until I got it to spin freely by hand with no more binding. I noticed though, that the backside of the pump body that mounts against the crankcase isn't flush. Is it safe to lap it flat on a pane of glass and some fine grit sand paper so it will sit flush?

Last edited by jhays79; 04/20/17 9:39 pm.
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Re: Lapping the mounting face of a A65 oil pump? [Re: jhays79] #692554
04/20/17 9:46 pm
04/20/17 9:46 pm
Joined: Dec 2004
Posts: 9,377
Scotland
kommando Online content
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kommando  Online Content
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Scotland
Yes, if you don't you risk distorting it as you do the retaining bolts up.

Re: Lapping the mounting face of a A65 oil pump? [Re: kommando] #692570
04/21/17 12:35 am
04/21/17 12:35 am
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jhays79 Offline OP
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jhays79  Offline OP
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Originally Posted by kommando
Yes, if you don't you risk distorting it as you do the retaining bolts up.



That's what I was thinking as well. Just double checking before I move on. Thanks!

Re: Lapping the mounting face of a A65 oil pump? [Re: jhays79] #692583
04/21/17 6:54 am
04/21/17 6:54 am
Joined: May 2013
Posts: 4,847
Rotherham - S. Yorkshire
Allan Gill Offline

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Allan Gill  Offline

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Rotherham - S. Yorkshire
You could always place the pump on a sheet of glass then tighten up the screws, it should keep the pump flat when you tighten it up. Otherwise you will have to stop it again to clean out any filings that you have shaved off.

7ft lb tightening torque and blue locktite on the threads (more important if your using bolts Rather than the original studs.


beerchug
Re: Lapping the mounting face of a A65 oil pump? [Re: jhays79] #692588
04/21/17 7:14 am
04/21/17 7:14 am
Joined: Sep 2004
Posts: 799
Farnham, Surrey, UK
gunner Offline
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gunner  Offline
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Farnham, Surrey, UK
Be careful when lapping the end faces on the oil pump or you may end up taking more material from one side or the other. Ideally you need a very steady hand and ensure the pump body is completley flat, keep checking every couple of minutes that the youre not over doing it.

+1 on the use of loctite on the bolts as they are often loose and this will lead to loss of oil pressure.


Last edited by gunner; 04/21/17 7:31 am.

1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
Re: Lapping the mounting face of a A65 oil pump? [Re: jhays79] #692594
04/21/17 8:49 am
04/21/17 8:49 am
Joined: Aug 2001
Posts: 3,919
argyll. scotland, uk
gavin eisler Offline
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gavin eisler  Offline
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argyll. scotland, uk
Also check where the pump mounts on the cases, the ally tends to pull up around the fastener threads, i used blue and a scraper to flatten.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Lapping the mounting face of a A65 oil pump? [Re: jhays79] #692596
04/21/17 9:24 am
04/21/17 9:24 am
Joined: Sep 2011
Posts: 185
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jhays79 Offline OP
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Thanks for the advice fellas. These pumps sure are a PITA! grin

Re: Lapping the mounting face of a A65 oil pump? [Re: jhays79] #692614
04/21/17 12:13 pm
04/21/17 12:13 pm
Joined: Aug 2001
Posts: 3,919
argyll. scotland, uk
gavin eisler Offline
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argyll. scotland, uk
Before the final build, lap the seat for the NRV in the pump body feed side, use an old ball the correct size, glue to the end of a 1/2 " dowell, , bit of fine grinding paste, check progress with a magnifying glass a continuous matt ring says you are done., this helps stop wet sumping, rinse thoroughly to get rid of any abrasive..
Use a new ball.
A useful trick, if the pump is a little tight, assemble with brasso and spin with a drill for a a few seconds, strip clean reassemble, Some drag is acceptable/ good.
One finger pressure on a short spanner to turn is about right.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Lapping the mounting face of a A65 oil pump? [Re: jhays79] #692639
04/21/17 8:42 pm
04/21/17 8:42 pm
Joined: Aug 2001
Posts: 802
San Luis Obispo, CA
Richard Phillips Offline
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Richard Phillips  Offline
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San Luis Obispo, CA
Not sure which pump you are working on. As been discussed before the early pumps can be trouble some. I have never been a fan of lapping anything on these pumps early or late. I have had good success noting exactly where the gears are positioned in the pump prior to removing them. Putting them back as they came out seems to work pretty good. A big problem can arise if the casting has warped it self out of flat. If it is the gear set will get tight.
If I take the gears out, I slam the assembled body sans gears on a surface plate. Then check for flatness.
I do like cleaning the feed hole with a ball and lapping compound.
Yes always run the pump with a drill motor in oil, and I like the Brass O idea, I think when it turns real good clean it with solvent but do not take it apart again.

Hope some of this is helpful

Richard

Re: Lapping the mounting face of a A65 oil pump? [Re: gavin eisler] #692657
04/22/17 12:51 am
04/22/17 12:51 am
Joined: Sep 2011
Posts: 185
NJ
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jhays79 Offline OP
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jhays79  Offline OP
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Posts: 185
NJ
Originally Posted by gavin eisler
Before the final build, lap the seat for the NRV in the pump body feed side, use an old ball the correct size, glue to the end of a 1/2 " dowell, , bit of fine grinding paste, check progress with a magnifying glass a continuous matt ring says you are done., this helps stop wet sumping, rinse thoroughly to get rid of any abrasive..
Use a new ball.
A useful trick, if the pump is a little tight, assemble with brasso and spin with a drill for a a few seconds, strip clean reassemble, Some drag is acceptable/ good.
One finger pressure on a short spanner to turn is about right.


Some good info here! Will do! Thanks!


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