2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

gas in my oil?

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Old Sep 24, 2007 | 03:02 PM
  #1  
510wagon's Avatar
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From: NS Canada
gas in my oil?

just drained my oil and there was some gas in it. its a 1988 TII
whats this from? i did flood the car the other day and it might have something to do with it.
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Old Sep 24, 2007 | 03:12 PM
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From: Newberg, Oregon
Failing oil control seals will allow gas to leak into your oil. Technical term is "blow-by" I believe.
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Old Sep 24, 2007 | 03:18 PM
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From: NS Canada
ok so can i have a little expiation of this? and is it at all passable that it just happened from flooding it really bad? or am i going to need to do some serous work?
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Old Sep 24, 2007 | 03:19 PM
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Ouch man, internal issues. Rebuild time! You bought a lemon.

Remember how my old Can-Am used to get gas in the oil, you have a similar issue, except it's a rotary.

My crank seal was toast, your oil control rings are toast.

Which is one of the seals that seal the rotors to the plates

They're basically large o-rings.

Last edited by '84-12A-GSL; Sep 24, 2007 at 03:31 PM.
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Old Sep 24, 2007 | 03:52 PM
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From: Newberg, Oregon
Originally Posted by 510wagon
ok so can i have a little expiation of this? and is it at all passable that it just happened from flooding it really bad? or am i going to need to do some serous work?
Sure! Oil control o-rings are rubber rings that work in conjunction with the oil control rings (hard metal rings) to seal the oil passage/eccentric shaft area from the combustion areas of the engine. The side seals (along the sides, following the contour of the rotors sides) hold back the combustion gases for the most part as well as the fuel/exhaust/etc, but when everthing is worn down, all of that stuff blows by and ends up passing through into the oil system (or visa versa). Gas in the oil is a good indicator of a well-loved engine.

flooding it really bad? If you are flooding the engine frequently, its probably because of a worn engine. Apex/Side/Corner seals that are worn beyond specs tend to cause low compression and flooding. If you aren't flooding much, and the car is still feeling completely driveable, I would keep going on it... but, start saving for a rebuild down the road. How far down the road? Thats not something I can answer. Could be 10 miles, could be 50,000.
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Old Sep 24, 2007 | 04:00 PM
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From: Canada
Sorry for mixing up oil control rings and oil control seal.

Looks like I should have bought that compression tester from Princess Auto, could have tested the engine before you bought the car.

Doesn't sound good...I got the 12a sitting in my driveway if you still wanna go rotary.
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Old Sep 24, 2007 | 08:50 PM
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I'm sure there was no gas in the oil when i bought it and i never really used it, it runs fine, except for the dead battery then i flooded it and left it over night and came back the next day got it going and it was ok. so i was hopping that from flooding it that it might of got in it some how. is that a possible at all?
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