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Oil in air filter box, compression test. 200 1976

posted by  Volvodad on  Tue Jul 13 16:50 CST 2004
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last visit: Thu Oct 23 16:18 CST 2014
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Your final cranking pressure values are good - they indicate nothing seriously worn in rings or valves. 'Tight' engines will achieve 99% of their final pressures on the first two strokes - after that the needle barely twitches higher. I'd say you have a bit of ring wear, and thus maybe a bit of blowby. So, if your oil separator box/flame trap is not clean and fully functional, you are going to have positive crankcase pressures and some oil misting out into the filter box.

So (as mentioned) clean up the throttle body, ditto the separator box and flame trap, and make sure you have a clean air filter...it will start restricting airflow very quickly if it is being fed an oil mist. Excessive oily vapors fed into the intake usually wind up as deposits on the back of the intake valves which can yield rough idling and defy all cures short of major disassembly and cleaning. Maybe just live with it if the tune-up path doesn't work?
--
Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar MGB, and numerous old motorcycles)






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