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Gas Smell in Oil
#954537
03/20/11 02:33 PM
03/20/11 02:33 PM
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Joined: Oct 2009
Posts: 56 Northern NJ, U.S.
71X-mark
OP
member
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OP
member
Joined: Oct 2009
Posts: 56
Northern NJ, U.S.
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I noticed that when I checked my oil level in my 440/496-6 bbl today it smelled like gas. The engine was completely rebuilt and driven until mid December and has only 1100 miles. I replaced the oil with Shell Rotella 10W40 and Lucas break-in treatment, and put about 100 miles on it before parking it in the garage for the winter.
I never ran the engine over the winter, but last week I wanted to go for a spin. I pumped the pedeal several times to get the car to start, which it did. However, while idling during warmup, I could smell gas at the exhaust pipes and figured it just needed to clear out. Drove the car for about 25 miles and parked it back in the garage.
Checked the oil today, and smelled gas--which I never noticed before. The oil appears thick and does not flow on the dipstick. I have the stock '71 closed crankcase system (PCV valve/3-nipple breather cap with all hoses connected). Just wondering whether this is due to the trapped gas vapor in the closed crankcase system, or something worse...like a leaking fuel pump, etc.
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Re: Gas Smell in Oil
[Re: 71X-mark]
#954538
03/20/11 02:49 PM
03/20/11 02:49 PM
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Joined: Jan 2003
Posts: 515 Bolingbrook, IL
HemiRunner
super street
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super street
Joined: Jan 2003
Posts: 515
Bolingbrook, IL
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Have you pulled any spark plugs to see if they are fuel fouled? Could have some crap holding a needle off the seat. Were the carbs adj & the jetting checked after the rebuild. May be running rich & washing the cylinders down with fuel. That's a good place to start.
Blown & Injected, need I say more?
71 Road Runner
04 Dodge Ram 2500 4x4 CTD
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Re: Gas Smell in Oil
[Re: HemiRunner]
#954539
03/20/11 03:24 PM
03/20/11 03:24 PM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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You should be concerned, it is not a good sign. If the problem is an over rich carb, or dirt in the carb, the excess gas will wash the oil from the cylinder walls and the rings will burn up. If you have a mechanical fuel pump, that can also be a sign that the pump diaphram has torn and gas is going directly into the crankcase that way. Get busy. , good luck
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: Gas Smell in Oil
[Re: 71X-mark]
#954542
03/20/11 06:42 PM
03/20/11 06:42 PM
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Joined: Jan 2011
Posts: 15,900 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,900
Central Florida
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You can have a sample of your oil tested. I did it once a few years back. I sent mine to Pennzoil (sp?) and they tested it for free. The results were very detailed with percentages of everything contained in the oil, and if any problems were noted. I got a phone number off the back of a quart of Pennzoil.
Facts are stubborn things.
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Re: Gas Smell in Oil
[Re: 71X-mark]
#954543
03/20/11 07:40 PM
03/20/11 07:40 PM
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Joined: Apr 2008
Posts: 1,285 Pacific NW USA
CompSyn
pro stock
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pro stock
Joined: Apr 2008
Posts: 1,285
Pacific NW USA
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Yep, that's a classic sign of fuel dilution in your motor oil. Either your carb(s) are running a bit rich or short distance stop-and-go driving; not letting the oil get up to temp. My car does it too as shown by Used Oil Analysis (UOA). I've heard you need to drive for at least 30-min each time you do a choke activated cold start. If that doesn't make since for you to do, then change the oil more often. I get my oil tested by the private label program through Polaris Laboratories as provided by Oil Analyzers, Inc. - link
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