Can you zoom away from the hole so we know exactly which one you are talking about? The picture doesn't look like the scavenge pump outlet (return).

It is the return. The oil has been drained from engine so I could take off the lines and get access.

And no, it does not turn when I jog the starter. I have not put a screwdriver in there to try to move it manually, but I suspect it will rotate and it should not.

That does suck.

Very possible one or both of the snap rings on the shafts are missing. That would allow the stubshaft to possibly slip off one of the two splines. And be engaged enough not to flop about in the case. Maybe the new pump was missing the snap ring and you didn't even notice?

But take heart. The single biggest obstacle to tearing down is the thought of doing it.

Since you have already learned to build it, doing it again is much easier and faster. Once you are in there you'll be able to find and fix the problem.

And yes, we understand about being depressed about this. A year from now this will be a great adventure.

But as someone once said " adventures suck when you are having them"

I found a picture of the pump during assembly.

http://forums.pelicanparts.com/uploa...1461031008.jpg

And this is where the scope went in.


http://forums.pelicanparts.com/uploa...1461031129.jpg

Looks like at least one snap ring is there. Other end is hard to be 100% sure but the dark shadow my be the other snap ring.

Not too promising.

It looks like the snap rings are both there, and I seem to remember them. I can't imagine that stub shaft stripping at the splines, has anyone ever heard of that? If that doesn't happen it has to be failure in the pump, but you never hear of that either. Thanks for the encouragement.

With the lower valve cover off you can look down the oil drain tubes into the case.

That is good to know VFR. I will not be able to do that till the weekend though. I will verify then if it is shaft or pump. I will pull the cover and scope down the tube and see if I can see the shaft rotate.or if it is even there!

Pump photo prior to install.


http://forums.pelicanparts.com/uploa...1461032394.jpg


Ring in on shaft and splines look OK. Argh!

Here is a shot of proud me with my new pump comparing to my perfectly good old pump.....

http://forums.pelicanparts.com/uploa...1461033532.jpg


So before someone screams at me, Enough Already! Take the dammed thing apart!

I have nothing else for now...

Thanks for your thoughts.

Can you even see the gears on the scavenge side? It looks like a smooth passage. Different than the stock pump.

Ok one last thing: I also had no oil pressure this last go around. Turns out the ground wire got pulled off the gage when I swapped to led instrument bulbs. Oil flowed but no gauge reading. Idiot light went out so I knew I had some pressure.

One-you cannot see the gear for the return pump through the return hole.
So--take the oil cooler off-remove the dead mouse blocking the passage and see if you
can see the pressure side gear turn when the engine cranks.

If there is a mouse in there he came from Germany. New cooler tank and lines.

I sacrificed an oil return tube and could clearly see the intermediate shaft rotate and the coupler not rotating. So the coupler is stripped on one end or broken. We took the engine out and got it onto the stand for teardown. So now I know I had a coupler or pump failure. Will do the forensics in the next couple of weeks.

So this is what the forensics revealed upon teardown.

996 pump jammed, would not rotate. Sudden jam caused intermediate shaft to shear at the cclip, weakest point.

All the drama happened on the scavenge side. Luckaly, so no compromised oil fed through the engine.

Pump hydro locked.


So why did it hydrolock?


I did not mention this engine is in a new 914-6 conversion. The oil tank I purchased is a reproduction of a factory tank with a bolt on oil console for oil filter. The bolts are 120 degrees apart. The console can be rotated and mounted in three positions. The one I chose was wrong. It blocked off the oil return to tank. So pump pumped to the console and hit a wall. Hydrolock. Everything else attached to the intermediate shaft stayed spinning. Shaft snapped.

So we have built it up again with a new shaft and pump. Heads up for those mounting oil consoles. Not sure if 911 is built this way or has offset bolts or is some way keyed to prevent misalignment.

Thank you everyone for your support.

At least you know why. Dead heading a gear pump, yes, that will do it.

But that is such an oddball scenario. Amazing how many points of failure exist.