Oil Fouling Air Filter - Defender Source
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Old April 7th, 2016, 10:41 AM
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Jason Hoffman
1986 90, RHD 200TDI
Join Date: Dec 2015
Location: Seattle, WA, USA
Posts: 68
Oil Fouling Air Filter

I have a new to me ROW D90 with a 200TDI. I'm going through it bit by bit, changing fluids, addressing leaks, etc. I changed the air filter yesterday and found it to be soaked with oil. What could the possible causes of this be? I want to start down the path of diagnosing and addressing the root cause.

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Old April 7th, 2016, 11:04 AM
1of40's Avatar
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NAS 97SW & 83 One Ten Tdi
Join Date: Dec 2003
Location: Potomac Falls & Wintergreen, Virginia
Posts: 6,085
Be Careful. Maybe worn piston rings. The engine could be pressurizing (exhaust gasses moving in the wrong direction) and forcing aspirated oil up the breather, if enough of it gets into the air intake it can start running on its own oil and that's a recipe for self destruction. Google is your friend to find ways to check/trouble shoot. Compression check would be one place to start. Should not be a huge surprise given these engines are old and have a very limited useful life. The good thing is you can unbolt and rebuild it .
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Old April 7th, 2016, 11:17 AM
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John B.
1991 Defender 90, 200TDI
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Join Date: Sep 2003
Location: Calgary
Posts: 9,248
The oil is from the CCV system. Normally you should only get some oil while running, so it goes into the engine and not into the filter.

First check the CCV oil separator as per the manual.

Then check that you do not have excessive blowby.
Pissing people off on the "net" since 1983.

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