930 Oil Pump Rebuld

CaptainCalf · 03-28-2011, 04:51 AM

Can anybody tell me how to locate parts to rebuild my turbo pump?

I've searched but can find a rebuild thread and as for the pump I can find the whole thing, but can't find internal parts for either 930-107-008-70 or 996-107-008-70.

I need keys for keyways and one of the long gears has some pitting on it so I'd like to replace it...it's the longer gear in the pic standing upright that goes on the splined drive shaft, but it looks like both long gears are the same on both shafts...

Thanks,
RC

350HP930 · 03-28-2011, 08:02 AM

Are you looking to replace the key or have you not found it? I'm pretty sure its in one of the parts boxes if its the latter.

The long gears are for the scavenge side of the pump so the small pits in the one gear shouldn't be an issue if you are worried about reusing it.

CaptainCalf · 03-28-2011, 08:07 AM

Quote:

Originally Posted by 350HP930

Are you looking to replace the key or have you not found it? I'm pretty sure its in one of the parts boxes if its the latter.

The long gears are for the scavenge side of the pump so the small pits in the one gear shouldn't be an issue if you are worried about reusing it.

Thanks Tony, I'll track down those keys

That's great news on the long scavenge side gear cuz I can't find parts anyways...guess they want you to buy the whole pump

Daviboy · Daviboy's Garage

RC I hope you kept a track of which gear came off which spindle as they are pretty much matched to mesh with each other (ask me how I know) and if not replaced in the same order they came off then could cause binding problems.

CaptainCalf · 03-28-2011, 08:16 AM

Quote:

Originally Posted by Daviboy

RC I hope you kept a track of which gear came off which spindle as they are pretty much matched to mesh with each other (ask me how I know) and if not replaced in the same order they came off then could cause binding problems.

Good point Daviboy, I think the same gear sizes were matched up side by side big meshed with big and small with small, but just to make sure can anybody out there open one up and provide us with a picture?

Thanks,
RC

Daviboy · Daviboy's Garage

RC obviously big goes to big and small to small but the actual gear mesh is what I am on about. I took the old pump out my sc as it was shot and opened it up to have a look at the internals. Beofre taking it apart the gears spun easily.
I did not mark the line up of the gears before removing them from the spindles and after re-assembling the gears were binding on each other. I subsequently bought a good used pump and disassembled this time marking the end of the gears, cleaned everything up lubed and reassembled and had no issues with binding. It seems that the 28 years the gears had been spinning had bedded each tooth to it corresponding partner and did not like being mated with another. Thats why I said ask me how I know....

CaptainCalf · 03-28-2011, 09:25 AM

Quote:

Originally Posted by Daviboy

RC obviously big goes to big and small to small but the actual gear mesh is what I am on about. I took the old pump out my sc as it was shot and opened it up to have a look at the internals. Beofre taking it apart the gears spun easily.
I did not mark the line up of the gears before removing them from the spindles and after re-assembling the gears were binding on each other. I subsequently bought a good used pump and disassembled this time marking the end of the gears, cleaned everything up lubed and reassembled and had no issues with binding. It seems that the 28 years the gears had been spinning had bedded each tooth to it corresponding partner and did not like being mated with another. Thats why I said ask me how I know....

Oops, didn't even think about the mating of the teeth over the years. Guess it's time to upgrade pumps

KTL · 03-28-2011, 09:33 AM

Yep, the thing that stinks is that the 930 pump is no more. Porsche says its NLA and you are therefore superseded to the 996 Turbo pump. Not saying that's a bad thing, just pointing out the original 930 pump is no longer in production.

Pelican Parts - Automotive Parts and Accessories - Porsche & BMW

CaptainCalf · 03-28-2011, 09:40 AM

Quote:

Originally Posted by KTL

Yep, the thing that stinks is that the 930 pump is no more. Porsche says its NLA and you are therefore superseded to the 996 Turbo pump. Not saying that's a bad thing, just pointing out the original 930 pump is no longer in production.

Pelican Parts - Automotive Parts and Accessories - Porsche & BMW

I noticed that when looking for replacement gears, but wouldn't it be smarter to go ahead and get the next level pump?

Pelican Parts - Automotive Parts and Accessories - Porsche & BMW

KTL · 03-28-2011, 09:47 AM

I think the catalog is incorrect in that the one you linked is the GT3 pump (which is the next step up and supposed to be the hot setup) but it says 2001-2005 Turbo?

I haven't done one but I recall reading that the GT3 pump requires some additional clearancing in the case? I didn't gather that being a big deal, but it should be mentioned nonetheless. So, yes, for the additional $ the GT3 is supposed to be the cat's meow, bee's knees, the hot ticket, etc. etc. yadda yadda yadda

CaptainCalf · 03-29-2011, 05:31 AM

I did find a used GT3 pump, but not sure what it would take to make it fit my 1987 930 case.

Also, my 930 pump seems to be fine with no binding, so after some more testing I may just stick with it.

Thanks,
RC

ajwans · 03-29-2011, 02:25 PM

When I pulled my pump apart (4 rib aluminium) the gears were
marked by a circle. All these circles are roughly 'up' at the
same time.

IMG_3933, on Flickr

andy

CaptainCalf · 03-30-2011, 05:46 AM

Quote:

Originally Posted by ajwans

When I pulled my pump apart (4 rib aluminium) the gears were
marked by a circle. All these circles are roughly 'up' at the
same time.

IMG_3933, on Flickr

andy

Thanks Andy, I'll look for those little circles. Any more pics of it showing the key or keys that go in the 5mm wide key ways? I need to track down some, so thanks in advance for your help.
RC

Henry Schmidt · Henry Schmidt's Garage

Let me know exactly what parts you need. I'm certain I can supply them "no matter how much it costs".

CaptainCalf · 03-30-2011, 07:19 AM

Quote:

Originally Posted by Henry Schmidt

Let me know exactly what parts you need. I'm certain I can supply them "no matter how much it costs".

LOL! Henry, I'd say you have about anything anybody would want

I need one of the longer 5mm wide keys that goes in the 65mm long key way on the shaft inside the pump to lock the gears on the shaft.

Thanks,
RC

nocarrier · 03-30-2011, 11:34 AM

So what exactly is done when one of these pumps are blueprinted? Is it just machining the case for proper clearance? Or is there much more to it?

CaptainCalf · 03-30-2011, 11:45 AM

Quote:

Originally Posted by nocarrier

So what exactly is done when one of these pumps are blueprinted? Is it just machining the case for proper clearance? Or is there much more to it?

I'd be interested in that answer too. I've read that you can skim the housing to remove play, but not sure blueprinting would be required to do that...RC

KTL · 03-30-2011, 11:50 AM

Here's the shimming description I once saw. Haven't had a chance yet to see what's involved in doing it.

See YTNUKLR's post at the very bottom

Internal Oil Pump

Walt Fricke · 03-30-2011, 12:18 PM

The GT3 pump requires removing some of the internal case webbing. You can do it yourself with a die grinder. This pump is even longer than the 930 pump (though it uses the same tubular splined connecting shaft) so it needs a bit more room. I clearanced a regular 3.0 case (which, of course, has a 930 casting number even though not a turbo case) for one and used a saw to start with to cut down on the grinding, so I don't know just how much less is needed with a case which came from Porsche machined for the 930 pump.

I think that purchasing good used parts from some kind soul like Henry is the only way to get parts for 911 oil pumps. Parts for them were never sold separately by Porsche, and I am pretty sure the pumps were made specifically for Porsche rather than being made up of more general purpose parts.

CaptainCalf · 03-31-2011, 07:24 AM

Quote:

Originally Posted by Walt Fricke

The GT3 pump requires removing some of the internal case webbing. You can do it yourself with a die grinder. This pump is even longer than the 930 pump (though it uses the same tubular splined connecting shaft) so it needs a bit more room. I clearanced a regular 3.0 case (which, of course, has a 930 casting number even though not a turbo case) for one and used a saw to start with to cut down on the grinding, so I don't know just how much less is needed with a case which came from Porsche machined for the 930 pump.

I think that purchasing good used parts from some kind soul like Henry is the only way to get parts for 911 oil pumps. Parts for them were never sold separately by Porsche, and I am pretty sure the pumps were made specifically for Porsche rather than being made up of more general purpose parts.

Thanks Walt, that GT3 pump would be sweet, but at $1349.00 at my local dealer I think I'm gonna try to stick with this 930 pump

here's some pics of the keyway for the missing key