From: muzician21 on
7MGE inline 6 in a Toyota Cressida, the oil pressure light has been
coming on when hot and at low idle, about 30 - 40k out from a rebuild.
Oil sender was replaced new when the engine was built.

Gauge from Advance which I realize you're going to turn up your nose
at is showing really low - like about 5 psi at about 600 - 700 rpm.
Jumps up well over 30 psi at highway speed.

I've always heard 10psi per 1000 rpm as a ROT, seem to be getting
enough pressure at speed but seems low at idle. Am probably going to
change the pump out and see if that cures it. Got a Clevite pump,
anyone have any feelings about them one way or the other?

Thanks
From: Ray O on

"muzician21" <muzician21(a)yahoo.com> wrote in message
news:3925ca1d-9242-4323-b137-175f95a8df75(a)26g2000yqo.googlegroups.com...
> 7MGE inline 6 in a Toyota Cressida, the oil pressure light has been
> coming on when hot and at low idle, about 30 - 40k out from a rebuild.
> Oil sender was replaced new when the engine was built.
>
> Gauge from Advance which I realize you're going to turn up your nose
> at is showing really low - like about 5 psi at about 600 - 700 rpm.
> Jumps up well over 30 psi at highway speed.
>
> I've always heard 10psi per 1000 rpm as a ROT, seem to be getting
> enough pressure at speed but seems low at idle. Am probably going to
> change the pump out and see if that cures it. Got a Clevite pump,
> anyone have any feelings about them one way or the other?
>
> Thanks

The factory repair manual has specs for clearances between the crescent,
impeller, and pump body. Check the clearances before you swap the pump.
Besides a bad pump, excessive bearing clearances can cause low oil pressure.
--

Ray O
(correct punctuation to reply)