Date: Tue, 08 Mar 2005 23:18:46 GMT
From: Robert <>
Subject: Re: Oil Catch Tank

Paul Halliday wrote: > I'm looking for an oil catch tank solution for the crankcase ventilation > system on my 1989 900 T8. I'm getting oil dripping down onto the fuel > metering plate and into the airbox. I'd like to (a) stop it and (b) get a > handle on how much oil ... I don't seem to need to top up at all really; > maybe a "gloop" now and again. ----8<----cut--- Paul, I've had oil drops come from the valve cover ventilation hose to the air filter canister and clog the filter on my cars. But this was on single carb 900 and 99 cars (had one of each). Don't know if the following is applicable to the turbo models but here goes: if the valve cover on turbo models has a hose running from the centre to the airbox ... ... then you could have a partially clogged mesh screen in the valve cover. You can't see the screen, but if you remove the valve cover (I'll assume there's some kind of Hall effect distributor that you have to align to top dead centre before taking the cover off) you'll find the slot on the inside, leading to the screen, leading to the round hole out to the hose. When the screen clogs, there will be too much pressure in the crankcase, causing oil to condense when reaching the space under the valve cover. The resulting liquid runs down the tube into the airbox. A good way to clean the screen is to remove the valve cover, invert it on the garage floor, pour a small amount of petrol into the slot leading to the screen, let it run through the circular hole out to a bucket, repeat process until petrol runs freely through slot/screen. Dry off, reassembly is reverse of disassembly as they say in the Haynes world, and presto you should have no more oil dripping into your airbox anymore. Oh yeah - forgot to say - clean the hose leading from the valve cover to the airbox, petrol is a good idea again. Tell us how it goes. /Robert

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