What am I looking at here.

[wndsnd]

Scope view into case fitting of return.

Is this the oil pump gear? I am investigating oil pump failure..

Also
Does that look like a red seal and if so isnt it on wrong side of case

[wndsnd]

I think it is the oil pump, but I am trying to get my arms around failure of new 993 pump on a fresh build. I have zero oil pressure so I thought if I could put a remote starter on it and take off the oil return hose and scope while turning over, if I could see the gears I would be able to tell if the pump failed or pump shaft failed.. just want to confirm what I am looking at before I R&R.

As you can imagine I am depressed about this.

[afterburn 549]

Sorrry man,
Have you verified the problem with a mechanical gauge ?
Also there are pressure relief valves with each their own springs that have to be in their correct homes .

[Flat6pac]

One of the oil pump seals fell off on assembly of the bottom end.
Bruce

[Tippy]

Originally Posted by Flat6pac

One of the oil pump seals fell off on assembly of the bottom end.
Bruce

Good eye.

Victor Reinz gaskets?

[wndsnd]

Yes I have verified with two gauges, two sender, pulled both pressure valves, pressurized the case, etc. This is kind of my last try to verify it is the pump which I would find highly unusual but I have read it does occur. If it is the pump gears, they do not move when I hit the starter. At first I was chasing senders but then I moved on to a dry pump. But now I guess I am realizing I really have a complete failure here.

It would make seinse I am seeing a red oring on right case side but it doesnt match picture in Waynes book?

[wndsnd]

Yes I agree a seal would be a cause of no pressure, but is that the pump and if so I should see it turn. I havent tried moving manually because if it spins manually without turning over engine that would also verify pump or shaft failure?

[wndsnd]

Tippy case seals were Wrightwod

[wndsnd]

Bruce, holding onto the thought that it still might not be me, was keeping me from jumping off a cliff, but it looks like it is coming apart again anyway.

[prschmn]

If that is a case seal on the return it wouldnt cause a loss of pressure-just wouldn't scavenge the oil. But my eyes are old and weak. If you can't see the gear turning though-ugh.
I wonder if the two clips were on the drive and pump shafts? Otherwise the coupler could have slid off maybe? If there's something I can do-look at I'd be happy to-Im only a few miles from Amesbury.

[Flat6pac]

I can't see the pump drive failing but if you look into the access for oil to the pump, turning over the engine, you should see gears moving.
I'm still going with one of the seals falling off the pump when you dropped the left half one he bottom end.
BTDT more than once....
Bruce

[wndsnd]

Its a big 993 turbo pump with screen that fills the sump. Have not pulled plate yet, if I could see past screen I should see pump shaft

[wndsnd]

Thanks Mark and guys for helping.

[prschmn]

I think we should start a pool-----

Could we be seeing the overlapping edge of a correctly installed o-ring?
Unfortunately that doesn't help with the no pressure problem.

[wndsnd]

Winner, Winner!

[john walker's workshop]

Originally Posted by wndsnd

Its a big 993 turbo pump with screen that fills the sump. Have not pulled plate yet, if I could see past screen I should see pump shaft

Rip out an oil return tube. Should be able to see the shaft then. You sure you installed it?

[wndsnd]

Well I am sure I bouvht it, as it is shorter, and test fit it, but no, my memory isnt photographic unfortunately, but I did have another 911 guy with me when we sealed the case so both of us would have had to miss it.

I will sacrifice a tube. Good idea, I can scope good through there.

I read one thread about pumps missing key internally but I have never taken one apart to visualize this.

Also this pump was sold to me as new, installed, then removed and never run when PO found a GT3 pump he preferred.

I remember turning and putting some assembly lube in it, so if it was missing a key, maybe there was still enough friction for it ti turn without load. All speculation of course untill I break it down again, but I like the idea of going through a tube to check thre shaft so at least I eliminate that.

[Spenny_b]

Would you even need to sacrifice a tube - could you not push the scope down the tube once you remove the valve cover?

[wndsnd]

Hmmm ....

Scope is small enough and long enough to go there if there is access. But what will I find? Mark has me thinking of those shaft clips. If they failed or are missing, would the shaft migrate off the splines and drop off? Still would have to come apart. I think anything at this point still means a teardown. I will not be able to look at it again till next weekend.

I would like to see if the shaft moves or rotates when I jog the starter though......

BTW, engine runs, so the intermediate shaft is intact.

[VFR750]

If you look into the return line hole you should be looking at the scavenge pump gears. There doesn't seem to be any oil in the picture. Odd. Where did the oil go?

If someone turns the engine over by hand, can you see the gears move?