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Date: Sat, 09 Sep 2000 23:04:38 +0200
From: Robert Brown <rjbnopsamnetnospam.se>
Subject: Re: Oil in air filter,Saab 900 GLS


Hi, I've had the same problem on two cars (1983 900GL and 1983 99GL both single carb). If you're new to the Saab crankcase ventilation system, you might find some background info useful: The crankcase fills with blowby gases (the stuff that forces its way past the piston rings during combustion) and these have to be evacuated somehow. You'll find that this is done via the valve cover that sits atop the cylinder head. Note the rubber hose running from it to the top of the air filter canister. Before the gases leave the cover and down the hose to be recycled, they go through a small screen in the same cover. When the screen starts to get clogged, excess pressure inside the valve cover is generated and this causes more oil vapour to go through the screen, which means that oil starts running down the rubber hose and clogs the air filter. Yuck. The easiest way to fix this is to remove the valve cover (8 long allen key bolts - make sure that you turn the flywheel to 0 degrees i.e. top dead centre). It's best if the distributor - without cables - is still bolted on, otherwise you may have to redo your ignition timing. Invert the cover, put a metal pan under it, and put some petrol through the opening in one end. Avoid getting the petrol on the distributor end. Once screen - which you can't actually see - is cleaned and completely dry, clean out the valve cover and refit. Note that the sprigs on the distributor shaft are off-axis and have to be aligned with the camshaft. You may have to rotate the distributor rotor 180 degrees to get the right orientation. This is why you needed to get the flywheel to TDC earlier. Whatever you do, don't force. Might be a good idea to clean out the rubber tube from the valve cover to the air filter canister as well. If the above description is too confusing, email me with a question or 2 and I'll explain a bit more that way. Remove the "nospam" in the address. Good luck, tell how it goes. Regards, Robert Gothenburg marinpetrovnopsameja.com wrote: > I was changing the air filter on the Saab 900 GLS > (double carburator, produced '83) that I acquired > recently and was quite unhappy to see that it was > almost soaking with engine oil. Being quite new > with saabs, I'd appreciate some advice on how to > interpret this and what should I do. Thank you! > > Sent via Deja.com http://www.deja.com/ > Before you buy.

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