Date: Thu, 2 Sep 1999 08:08:02 -0400
From: "Eric Law" <>
Subject: Re: 9000s Oil Problem

James, Gotta disagree with Gregory on this one - I don't think the oil filter has anything to do with it. The oil in your motor lives in the oil pan, which is at the bottom of the motor. It gets pulled into the oil pump, which pressurizes it. The pressurized oil then flows via the filter to various bearings in the engine. It then drips off the bearings, no longer under pressure, and runs back down to the oil pan for another go-around. The oil-filler tube leads to the oil pan, thus it is not seeing oil under pressure from the pump. As the engine runs, gases (combustion products) escape past the piston rings into the crankcase - this is the part of the motor above the oil pan. If there is no place for these gases to go, or if the venting system cannot handle the amount of incoming gas, the crankcase/oil pan will become pressurized, and oil may be forced out of the filler. So there are two potential problems. #1 is that the piston rings, or something related, are worn to the point that excessive gas (this is called "blow-by") is entering the crankcase. This is most common on high-mileage engines that have not been maintained well, and will often be accompanied by blue smoke out the exhaust. Fixing leaking piston rings usually requires rebuilding the motor. Potential problem #2, the more likely one, is that there is some sort of problem in the venting system. If you look at the motor, on the very top you'll find a large, black-painted, cast-aluminum cover (the one with the word "SAAB" cast into it in large letters). At the rear of this cover, toward the right-hand side (looking from the front of the car), there is a black plastic fitting with a hose coming off it (the hose is about 1" dia. on the outside). This is the crankcase vent. Remove the fitting & the hose and make sure it, and everything it's connected to, is not plugged. If you don't find any blockage, you may have problem #1... Good luck! Eric Law P.S. Also make sure you have the *correct* amount of oil in the engine! Be sure you check it on a really level surface, and don't overfill it. kik <kionopsamorg> wrote in message > Hi, I have an 89' 9000s which is having an odd oil is pumping > all of its oil out of the oil filler with enough presure to spray aroung the > cap.. the engine runs like a top w/ no problems or burning oil and i am at a > loss as to what is causing this.. anyone ever have a simular problem?? > thanks in advance.. > > > James > > 86 9000t > 89 9000s > 87 900t > > > >

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