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Date: Wed, 12 Jun 2002 08:47:09 -0400
From: "KeithG" <noonenopsamhlink.net>
Subject: Re: Saab 9000 low oil pressure - what next?


is that inch or mm? KeithG "danny" <dannynopsamia-esprezzo.com> wrote in message news:3D067329.39343E88nopsamia-esprezzo.com... > Hi Keith, > > Tonight we removed the oil pump again and checked the clearance between > the outer gear and the housing. It should be between 0.03-0.08. We > were able to get a .15 feeler in and also with a struggle a .20 in some > places, so I guess this is at least partly the answer. We also found > evidence of scoring upon closer inspection, so it's a new pump and oil > pressure relief valve before we look elsewhere. There is also slight > evidence of scoring on the timing cover face, but I can't afford to > replace the complete timing cover at this time. I also drained some oil > from the sump and didn't find any foreign objects in it, although we > could discern a few "gritty" bits in the 1/2 litre or so of oil we > drained. If we get oil pressure back and the engine runs OK I will get > it drained and flushed. > > Regards, > Danny > > KeithG wrote: > > > > I do not know what to say, here. No or low (real) oil pressure would > > indicate a failed pressure spring or plugged supply. You have verified that > > the sopply is clear and that the oil pump bits are not worn out of spec? As > > the rotor and housing wear, the pressure will drop, but it would take a > > wildly worn collection of bits to generate no pressure. Did the bits fit > > snugly in the pump housing or was there a lot of play? Have you determined > > that it is not the pressure sensor and that it is indeed generating > > pressure? > > "danny" <dannynopsamia-esprezzo.com> wrote in message > > news:3D05A826.CF9B2844nopsamia-esprezzo.com... > > > KeithG wrote: > > > > > > > > you should prime pump by packing it with Vaseline before reassembly. > > > > Delivery pressure is determined by oil pump measurements. These > > measurements > > > > are in the Bentley manual and are not detailed by Townsend's doc > > (attached). > > > > At this point, you have 2 options. 1: crank 'till oil pressure is > > visible by > > > > the light extinguishing or 2: disassemble and reassemble with a little > > > > petroleum jelly in the pump voids. > > > > > > > > http://216.78.172.244/engine_folder/front_crank_seal900.htm > > > > > > > > > > Thanks for the advice Keith - we never found that part in my manual. > > > Any idea of where a blockage might be, as so far all we are doing is > > > reassembling (correctly, this time) without having found anything wrong, > > > unless the measurements on the oil pump rotors show them to be out of > > > spec, but nothing explains why the car seemed fine on one trip, yet no > > > oil pressure on next trip. > > > > > > -- > > > Regards, > > > Danny > > > > > > http://www.gaggia-espresso.com (a purely hobby site) > > > http://www.dannyscoffee.com (UK advert for my mobile espresso service) > > > swap Z for above characters in email address to reply > > > > > -- > Regards, > Danny > > http://www.gaggia-espresso.com (a purely hobby site) > http://www.dannyscoffee.com (UK advert for my mobile espresso service) > swap Z for above characters in email address to reply >

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