No leaks anywhere (yet) so I’m pretty sure no plugs are missing. Here are a couple more shots in case someone sees an installation error. BTW, both pipes had new O-Rings installed that seemed to fit well.
When viewed from this angle, the pickup pipe will have a big air bubble in it, but my thought was that pumping a few quarts of oil thru the gallery should force a fair amount backwards through the discharge pipe and the pump and out the pickup into the sump. Of course some will go into the mains too.
Here’s the pan prior to installation. I don’t think there is a way to block the pickup and still have it go on.
Hi Rick…are you not seeing pressure on the guage becaus you still have the garden spray bottle attached…try removeing it and blocking the T piece. …im thinking that pressures from the pump is getting lost in the bottle…Steve…ps is your pressure valve in the filter head open and allowing all the oil to return to the sump…try clamping the return hose
You cannot prime the pick up that way. Oil pumps are positive displacement.
If you primed the gallery and got pressure, I am surprised cranking did not show pressure.
After changing main seals in the 68, it did take a few trys to prime it.
I would be cautious. It should eventually show something. 5 lbs is adequate.
You may have already done this…
Have you taken off the oil filter adaptor assembly (that converts to spin on filter)?
It may be worth checking if they machined it wrong or perhaps if assembling it “wrong face in” blocks the oil from the pump.
And while it is off, spin the engine!
That’s the plug I had in the bypass nipple. The camera angle makes it look like its near the pump.
I’ve tried it with the line plugged and the bottle removed. Also with the line completely open to see if anything burbles out.
Ah, I see what you mean. The pump, being positive displacement, blocks the gallery pre-charge from filling any more than a small part of the pump. The suction pipe will remain empty.
I wonder what would happen if I rotated the engine backwards by hand while holding pressure on the gallery. Seems like the pump might work in reverse and perhaps slowly fill the suction pipe.
I have not tried this but it’s worth a look.
You’re probably right (hopefully). If nothing else, I can use the bottle to charge the gallery while I try to start it. It should buy me a bit more run time even in the event the pump doesn’t start working. Basically, I’d be using the bottle as a temporary pump.
I’m not sure what a bypass nipple is. Maybe a 3.8 didn’t have it. There are several plugs which if missing could cause a silent loss of pressure without any exterior oil leak. Mine has a rather large plug in front of the distributor bushing inside the timing cavity. And there is at least one, maybe two plugs behind the oil filter housing. Did these all get replaced?
Filling the gallery is where the oil goes is after it comes from pump through the filter so you may not have forced oil all the way through the filter to the oil pump. The pump is pretty tight tolerances and will likely not allow flow towards from the gallery through the filter-
I am optimistic that taking the whole filter housing assembly off may allow pump priming or might reveal a problem with machining of the spin on adaptor or even a gasket problem.