Is there a good seal between the oil pump and the "pickup tube" that
goes down into the pan? Though if you get oil pumped, then it probably
isn't sucking air?
Are you measuring oil pressure cranking? Or with the engine running?
I'll second Max's suggestion to check the pressure with another
guage. Probably a mechanical one. If you disconnect the guage/sensor,
from the block, will oil shoot out?
lrc
On Sun, Apr 27, 2003 at 07:28:41PM -0500, Den's E-mail 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
>
--
I've found something worse than oldies station that play the music I used to
listen to. Oldies stations that play the "new" music I used to complain about.
lrc@red4est.com http://www.red4est.com/lrc
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