Please help!! no oil pressure after oil change!!

-
Assure yourself the dist. gear is not spinning on the shaft. This is possible with some of them.
 
Pump O rings and gasket? There's an O ring on the pump snout

Yep, the gasket was in place and the O ring too, but the O ring was quite "flat" but I belive it was good enough not leaking.

I"m still baffled as to what happened. Everything was fine, you changed oil and then nothing. (Thinking out loud)

Me too...

I would take another look at that intermediate shaft and try to assure myself the shaft is not slipping. Also it's possible the gerotor shaft could have spun if something bound up the pump.

I force it now when it was dismounted but no slip.

Assure yourself the dist. gear is not spinning on the shaft. This is possible with some of them.

Well it looks like that the shaft drives the dist and the oil pump and the gear drives the shaft, so if it's spinning then the dist would not rotate either, but it does.
Hopefully I'll get the new parts tomorrow and I can spend a few hours inte the garage.
 
My own theory this far is that the pump was worn, not that worn that it couldn't build pressure when it had oil but when I drain the oil it couldn't manage to suck good enough to suck up oil from the pickup tube, the junk in the screen did reduce flow and makes it even harder to suck up the oil (get rid of the air).
What do you think about that theory?
 
If that's all that came out of the strainer I doubt it had much to do with it. I'd agree, you happened to get the worn pump (too much rotor clearance) in right position to allow all the oil to drain back and loose prime.
Installing a "dry" filter didn't help matters.
 
Well whats your next step? New pump, pack it with assembly lube, clean the pick up, new filter with some oil to prime, a new intermediate shaft with a hardened tip just for safety's sake? I would pull the distributor and prime the engine with a drill any way.
 
My next step is new pump, new pickup, new filter with some oil in it and then prime it with a drill.
 
I made a cheap priming tool by taking an old oil pump drive shaft, and grinding all the teeth off the gear. Drop it in, and using an old distributor shaft to spin the priming shaft. A little work, but I had the stuff laying around.
 
the engine is full of gunk ( carbon, maybe some old gasket material) someone didn't change the oil enough, and the oil pick-up got clogged up, and I would suspect the engine bearings are now damaged, but a aftermarket oil gauge to monitor engine oil pressure, you should have atleast 40 psi of oil pressure, and the max should be 55 psi, if your engine doesn't have atleast 40 psi, then the engine should be rebuilt ( including having the crankshaft turned and new cam bearings, as well as the main & rod bearings, new timing chain, rocker shaft cleaned etc
 
Thanks everyone for all your advice!!
I changed the pickup and oil pump, did fill the filter half way and primed the system and now the pressure is back!
 
Assure yourself the dist. gear is not spinning on the shaft. This is possible with some of them.
I believe these plastic pieces are your valve guide seals. They break up like that and can block the screen. Small black brittle pieces. I've seen this before. You don't have to pull the motor. Puff of smoke when it starts? just my thought.
 
Yep, puff of smoke when it starts, a couple of worn valve guides too (fluttering vacuum when idle), I'm going to get the 516 cylinder heads rebuild after this summer. I have a pair of 906 heads in good shape on the shelf but I think I'm loosing too much C/R with them.
 
What bothers me, here, is that you still have not found the actual cause. Is it a cracked pickup tube? Pump so damn worn that it won't suck 90W? Leaking air past pump seals? To parrot an often quoted phrase, "this ain't rocket science."

My beater "white whale" ram recently lost pressure going down the highway!!! But it was a quart low, and has 200K on the clock, LOL
 
I'd say that his gerotor set is shot. I believe these are pressed powder metal, probably won't last too long running them dry. I wonder how deep the grooves are and what the clearance is. The set below is a pinned Melling.
MellingGerotor.gif
 
-
Back
Top