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Author Topic: Smell of gasoline in my oil  (Read 990 times)

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Offline aminemed

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Smell of gasoline in my oil
« on: December 28, 2017, 01:27:08 pm »
Hi all

Had to drain my oil from my oil tank to do some paint job on the tank. I'm quite surprised that it smells so much gasoline. Is it only my CB750 or is it a common thing to have this smell?
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Offline Yamahawk

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Re: Smell of gasoline in my oil
« Reply #1 on: December 28, 2017, 02:36:40 pm »
It could mean that you have had a float stuck in a carb at one time or another, and gas was seeping into the engine which got dumped into the oil tank. That's the only way I could think of oil and gas mixed on a motorcycle.
Charlie
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Offline jlh3rd

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Re: Smell of gasoline in my oil
« Reply #2 on: December 28, 2017, 03:01:19 pm »
I always turn the petcock off to prevent gas from getting into cylinders and crankcase...
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Offline Terry in Australia

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Re: Smell of gasoline in my oil
« Reply #3 on: December 28, 2017, 03:12:37 pm »
Yep, that's what's happened, and even if you turn your fuel off, if the washers under the petcock mounting screws are boogered, fuel will still pass thru to your carbs. If you have a sticky float valve the fuel will run into one or more cylinders, seep past your piston rings, and fill your sump, thinning your oil, and potentially ruining your engine, not to mention the potential for fire. Fix your fuel leak, then dump your oil and filter, and replace them with fresh oil and a new filter. ;D
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Offline BobR

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Re: Smell of gasoline in my oil
« Reply #4 on: December 28, 2017, 06:28:55 pm »
  Dont be like me-take care of it asap. One time I had so much gasoline seep into the engine, after it started it, was blowing out the breather! The second time it hydraulically locked! I'm surprised the engine survived my abuse. Guess I'm fortunate I was trying to kick start it the second time.  After that I rebuilt the petcock and always make sure I'd shut it off. I actually turn off the petcock while the engine is running and let it go a few seconds too. Bob
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Offline Deltarider

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Re: Smell of gasoline in my oil
« Reply #5 on: December 28, 2017, 11:42:52 pm »
Avoid short distance rides.
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Offline aminemed

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Re: Smell of gasoline in my oil
« Reply #6 on: December 29, 2017, 01:38:07 am »
i'm changing oil and oil filter today before riding again
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Offline Deltarider

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Re: Smell of gasoline in my oil
« Reply #7 on: December 29, 2017, 01:58:49 am »
And check the overflow tubes are open.
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