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From: muzician21 on 30 Dec 2009 23:30 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 30 Dec 2009 23:59
"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) |