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Gas smell in oil?

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Offline Somer

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Gas smell in oil?
« on: October 31, 2003, 08:20:25 PM »
I was changing  my oil today and I noticed that it smelled like gas.  I talked to the guy at local 4x4 shop and he said that it was normal in a lot of gas powered cars.  Is this true? Do I have nothing to worry about?

Also, I seem to be leaking oil from the rear crank shaft, I think?  I can see oil coming out from between the engine and transmission houseing.  Is this also going to be a problem?

thanks for any input,
Somer
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jdraper

Re: Gas smell in oil?
« Reply #1 on: October 31, 2003, 11:27:17 PM »
Gas in the oil is NOT good.  How many miles on the truck?  Is the truck running ok?  Fuel mileage ok?? If not, and you have a fuel injected motor, you might want to make sure your fuel pressure regulator is keeping the fuel pressure low enough.

As for the leak, no leaks are good, but many vehicles do leak.  What weight oil are you using in your truck.  Going to a higher viscosity can help slow down leaks.
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Offline Somer

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Re: Gas smell in oil?
« Reply #2 on: November 01, 2003, 03:28:55 PM »
My truck seems to be running fine. It is a fuel injected V6 model and only has about about 65000km on it which comes out to about 40625miles, if my math is correct.  Though, I have noticed that my gas mileage has been getting a little bad lately.  Other then the smell will there be any other signs that gas is leaking into the oil?  Such as change in oil or exhaust color?  Is it safe to drive for now?
Oh, and I put 10-40w oil in the engine.
Thanks
Somer

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Offline deepmud

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Re: Gas smell in oil?
« Reply #3 on: November 01, 2003, 04:33:24 PM »
Gas in oil
Bad gas mileage

Sounds like your motor is stuck in open loop mode - I would suspect a stuck open thermostat, or a bad sensor to the computer, making the computer think the motor is cold. Not something you want to let go, the gas-thinned oil is not a very good lubricant, and the raw fuel is washing down the cylinder walls, causing ring wear.
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Offline NY_SIDEKICKER

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Re: Gas smell in oil?
« Reply #4 on: November 03, 2003, 12:21:42 PM »
OUCH  :(
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Offline Charlie

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Re: Gas smell in oil?
« Reply #5 on: November 03, 2003, 04:38:20 PM »
You should be able to buy a prepaid kit to test the engine oil at a fairly reasonable price. This might give you some indication, but it's  normal for some burnt oil to be replaced by some fuel from the motor as long as the oil level is not actually rising it should be OK.I also have oil everywhere underneath but the gearbox level is slowly dropping so I've not worried too much, it hard to  tell where it's coming from.    
Charlie
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Offline deepmud

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Re: Gas smell in oil?
« Reply #6 on: November 04, 2003, 02:09:47 PM »
It sounds like you are saying it is normal for raw gasoline to be in the oil. I don't think I have heard that. However, I have found rigs running in the open-loop mode (not getting feedback from the O2 sensor, like running on full choke) that washed down the cylinder walls. I have even seen a few rigs that added quarts of gas to the oil flooding FI motors in cold starts. One really severe case must have taken days of jumping, cranking, and pumping the pedal (DO NOT PUMP THE PEDAL ON FI MOTORS WHEN STARTING) to fully hydro-lock the engine. It took two 3 gallon pans to drain the motor (normal level was 6 quarts) and then after refilling the pan it would not crank - not realizing what was up, I even tried to bar it over with a two foot long ratchet - no go. Finally, I realized the cylinders were full of fuel - remove the plugs, cranked it over, and gas was everywhere!!!! What a mess.

Not your situation, but a very graphic story of what can be a bad thing.

Don't send out the oil sample, find out why the gas is in the fuel - your nose has already done a chemical analysisn and determined the oil is gasoline-contaminated.  Again, I suspect running in open loop, for whatever reason - unless you have the old, carberator habit of pumping the gas while cold-cranking in the morning. FI motors will way overfuel if you do that.

Also, if you ever do flood it, turn the key off and put the throttle to the floor. Then crank it. The computer will read the full throttle as being out of range, and shut off the injectors entirely. As the gas clears out, it should start to fire - lift your foot, and let the computer control the air and fuel to start.

Erik
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Offline Charlie

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Re: Gas smell in oil?
« Reply #7 on: November 04, 2003, 03:50:08 PM »
I wouldn't say there should be a lot of gas in the oil but if someone says they’ve done 10000km without using any oil then I don’t think this is correct, Its more likely a bit of burnt oil has been replaced by some gas .I’d guess you would run a thin oil in Japan during winter and  wouldn't need much gas there for you to smell it.
Regards Charlie
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Offline deepmud

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Re: Gas smell in oil?
« Reply #8 on: November 04, 2003, 05:17:10 PM »
I agree, burning oil is normal. The thin film on the cylinder walls burns some, even if the rings are theoretically perfect.

How is gas getting in there? Why would it replace the burnt or evaporated oil? Or is there an assumption that if the oil level doesn't drop, gas must be replacing the volume? There may be some, I guess, but not in an amount that I have noticed - not saying this as an absolute, but it seems unusual.

The important issue is that people should be concerned if they find fuel in the oil - likelyhood is that there is a problem.
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Offline Kreg

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Re: Gas smell in oil?
« Reply #9 on: November 04, 2003, 08:41:16 PM »
Quote

Also, I seem to be leaking oil from the rear crank shaft, I think?  I can see oil coming out from between the engine and transmission houseing.  Is this also going to be a problem?

thanks for any input,
Somer


That may be oil leaking down from your distributor onto your bell housing.   I had this problem about a month ago. One of the rings in the distributor blew and caused oil to go everywhere.
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Offline Somer

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Re: Gas smell in oil?
« Reply #10 on: November 04, 2003, 09:05:18 PM »
Quote


That may be oil leaking down from your distributor onto your bell housing.   I had this problem about a month ago. One of the rings in the distributor blew and caused oil to go everywhere.



I don't know much about engines, but the V6 engine that I have here in Japan has "direct ignition".  Well, at least I think thats whats its called.  Anyways, if I'm correct,  I think my car doesn't have a distributor.   Is this right?

Somer
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Offline Samurai_Hamster

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Re: Gas smell in oil?
« Reply #11 on: November 05, 2003, 09:15:52 AM »
Quote



I don't know much about engines, but the V6 engine that I have here in Japan has "direct ignition".  Well, at least I think thats whats its called.  Anyways, if I'm correct,  I think my car doesn't have a distributor.   Is this right?

Somer



Yes, each plug has its own coil on there. NO dist in these engines.
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Offline wildgoody

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Re: Gas smell in oil?
« Reply #12 on: November 05, 2003, 03:42:53 PM »
Gas smell, well ya, it's a gas engine, you will smell
some, thats normal, and to have a engine "leaking"
enough gas to get into the oil thru a running engines
rings......uhh I dunno bout that, even rich that's a stretch,
if it were that rich you would see black exhaust and you
would know by a super rich smell.

This truck is too new for these kinds of problems, not that
they could not happen, it's just a probably not.  Get the oil
tested, or have someone else smell and give an oppinion.

What would be a normal day drive in this truck???
if you don't drive too far, the oil never gets hot enough
boil/burn off and get rid of combustion byproducts. This includes
some sulfer which, if the oil isn't changed enough can form
sulfuric acid, kind of bad on internal parts. Most modern oils
have additives to combat the bad stuff that builds up in motor
oil, change every 5K Km and see what the next change smells like.

The times I've seen an engine "making oil" is with a diesel
that has a direct gear drive injection pump, the seals fail and
diesel fuel leaks directly into the crankcase.
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jdraper

Re: Gas smell in oil?
« Reply #13 on: November 05, 2003, 10:18:34 PM »
I've seen this happen in relatively new Explorers when the fuel pressure regulator malfunctions and doesn't regulate the fuel pressure down.  First symptom is loss of gas mileage and oil smelling like fuel.  The computer can compensate up to a point, but then you start seeing performance problems.

I would take your truck to someone who can hook it up to an engine analyzer to see what is going on.  As mentioned above, if you are getting excess fuel into the oil, it will severely damage the motor.
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Offline deepmud

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Re: Gas smell in oil?
« Reply #14 on: November 06, 2003, 01:40:55 AM »
Quote
Gas smell, well ya, it's a gas engine, you will smell
some, thats normal, and to have a engine "leaking"
enough gas to get into the oil thru a running engines
rings......uhh I dunno bout that, even rich that's a stretch,
if it were that rich you would see black exhaust and you
would know by a super rich smell. -cut-


Fuel in the oil from over-rich running does happen. The cats don't take it well, in fact I have seem them glow bright orange in extreme cases, but they do an amazing job of cleaning up the exhaust.

Has this care been checked yet? Got an appointment, at least?
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