The obvious question is, what are you using to measure the oil pressure?
Did the oil pressure gauge sensor get disconnected during this oil pan
business?
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
on 4/27/03 5:28 PM, Den's E-mail at dbuster@integraonline.com wrote:
> I know this one's a bit off the topic, but I'm hoping one of you has some
> thoughts on this. My wants-to-be-an-engineer son is about at the end of his
> tether. Here's a copy of the note I posted to one of the Nissan groups. I'm
> hoping one of you all has some thoughts.
>
> -------------
> '74 Datsun 260Z lacks oil pressure.
>
> My son has re-assembled the engine to his 260Z. The first time he did it, he
> had oil pressure. But then he decided to remove the oil pan and replace its
> gasket. Now that he's reassembled things again, he gets no oil pressure.
> We're stumped and more than a little frustrated.
>
> Here is what we know:
> --The oil pump is revolving when the engine turns -- well, we assume it's
> revolving because the distributor is revolving and both run off the same
> gears. And we know the oil pump works, because when you have it off the car
> and turn it with a screwdriver, oil shoots out.
> --He has primed the pump with oil and, when he removes the pump, the oil is
> still there, so we know it's not trying to pump air thru the system.
> --The intake screen and intake tube in the oil pan are not damaged and are
> clear of obstructions.
> --The engine's integrity is good -- no cracks in the block, no missing or
> damaged gaskets, etc. In other words, there is no oil leaking down the side
> of the engine from a bad gasket or crack.
> --Oil pan, head, valve cover, water pump, etc. gaskets are all new.
> --When you blow air through the inlet for the oil pump, you can feel it come
> out of the feeder tube for the oil filter so, at least in that part of the
> engine, we know there are no obstructions in the internal oil passages.
> --He never disassembled the oil pump, so we know it's not a question of
> something being installed improperly in the pump's reassembly.
>
> We're at a loss for ideas. We can't see anything we've overlooked to try to
> get the oil flowing thru this engine.
>
> Can anyone see anything we've overlooked or anything else we need to check?
> Thanks for any help you can provide.
>
> Dennis
> '71 Midget
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