Motorcycles » rec.motorcycles.tech » gas in oil
gas in oil [message #454973] Tue, 27 September 2005 05:16
Apple Jacks  
Hey everyone
Just a question. I have an '04 Aero 750 (3700 km), while doing regular
maintainance today I noticed the oil was rather runny ,transparent and
smelled of gas. I called the dealership and the guy there told me that I
probably over filled it............he did'nt say what "it" was........if its
the oil then they are at fault because the were the last to change it. If
it's the fuel tank, then how can that get in the crankcase? He also said it
would be okay to drive the bike in for them to look at it. Is that safe?

Tia
AppleJacks
Re: gas in oil [message #454975 ] Tue, 27 September 2005 05:32
Shrub  
Apple Jacks wrote:
> Hey everyone
> Just a question. I have an '04 Aero 750 (3700 km), while doing regular
> maintainance today I noticed the oil was rather runny ,transparent and
> smelled of gas. I called the dealership and the guy there told me that I
> probably over filled it............he did'nt say what "it" was........if its
> the oil then they are at fault because the were the last to change it. If
> it's the fuel tank, then how can that get in the crankcase? He also said it
> would be okay to drive the bike in for them to look at it. Is that safe?

No, it is NOT safe to ride a motorcycle that has gasoline in the oil.
You can ruin the bearings because gasoline thins the oil out too much.

If you left the petcock in the PRI position, gasoline can flow to the
carburetors all the time. If the float valves in the carburetors leak,
the extra gasoline can run down the throat of the carburetor into the
intake tract.

Gasoline will leak past even a closed intake valve, into the cylinder
and leak past the piston rings and flow down the walls of the cylinders
washing the oil off the walls as it heads for the crankcase where it
dilutes the oil.

It's possible for a backfire to ignite gasoline fumes in the crankcase
and blow your engine up. I knew a guy who blew the oil pan off his van.
Another guy had a crankcase explosion in his Honda VTR-1000 Super Hawk
and it blew the rubber plugs out of the ends of the valve covers where
the camshafts are.

That's probably what would blow out on your Honda if the vapors
ignited.

But, I don't recommend starting the engine or riding the motorcycle
until you find out what caused the gasoline leak and change the oil.
Re: gas in oil [message #454980 ] Tue, 27 September 2005 06:22
spamsucks  
"krusty kritter" <kriyamanna [at] aol.com> wrote in
news:1127791979.151101.79770 [at] g14g2000cwa.googlegroups.com:

>
> Apple Jacks wrote:
>> Hey everyone
>> Just a question. I have an '04 Aero 750 (3700 km), while doing
>> regular
>> maintainance today I noticed the oil was rather runny ,transparent and
>> smelled of gas. I called the dealership and the guy there told me that
>> I probably over filled it............he did'nt say what "it"
>> was........if its the oil then they are at fault because the were the
>> last to change it. If it's the fuel tank, then how can that get in the
>> crankcase? He also said it would be okay to drive the bike in for them
>> to look at it. Is that safe?
>
> No, it is NOT safe to ride a motorcycle that has gasoline in the oil.
> You can ruin the bearings because gasoline thins the oil out too much.
>
> If you left the petcock in the PRI position, gasoline can flow to the
> carburetors all the time. If the float valves in the carburetors leak,
> the extra gasoline can run down the throat of the carburetor into the
> intake tract.
>
> Gasoline will leak past even a closed intake valve, into the cylinder
> and leak past the piston rings and flow down the walls of the cylinders
> washing the oil off the walls as it heads for the crankcase where it
> dilutes the oil.
>
> It's possible for a backfire to ignite gasoline fumes in the crankcase
> and blow your engine up. I knew a guy who blew the oil pan off his van.
> Another guy had a crankcase explosion in his Honda VTR-1000 Super Hawk
> and it blew the rubber plugs out of the ends of the valve covers where
> the camshafts are.
>
> That's probably what would blow out on your Honda if the vapors
> ignited.
>
> But, I don't recommend starting the engine or riding the motorcycle
> until you find out what caused the gasoline leak and change the oil.
>
>

Save a sample of the old oil. One quart should be sufficient.

pierce
Re: gas in oil [message #454981 ] Tue, 27 September 2005 08:17
chateauSPAMKILL.murra  
krusty kritter <kriyamanna [at] aol.com> wrote:

> It's possible for a backfire to ignite gasoline fumes in the crankcase
> and blow your engine up. I knew a guy who blew the oil pan off his van.


I *wish* I'd seen that.


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Re: gas in oil [message #454983 ] Tue, 27 September 2005 09:17
spamsucks  
chateauSPAMKILL.murray [at] dsl.pipex.com (The Older Gentleman) wrote in
news:1h3jdke.os4zmrh4rlnvN%chateauSPAMKILL.murray [at] dsl.pipex.com:

> krusty kritter <kriyamanna [at] aol.com> wrote:
>
>> It's possible for a backfire to ignite gasoline fumes in the crankcase
>> and blow your engine up. I knew a guy who blew the oil pan off his van.
>
>
> I *wish* I'd seen that.
>
>

I knew a guy that blew the head off his straight six car engine with starting
ether. Yes it was in the car at the time.

r
Re: gas in oil [message #454985 ] Tue, 27 September 2005 14:57
Shrub  
The Older Gentleman wrote:
> krusty kritter <kriyamanna [at] aol.com> wrote:
>
> > It's possible for a backfire to ignite gasoline fumes in the crankcase
> > and blow your engine up. I knew a guy who blew the oil pan off his van.
>
>
> I *wish* I'd seen that.

The oil pan was all bulged out and twisted and there were a whole bunch
of sheared-off bolts still in the engine block. Fortunately, oil pan
bolts are usually not installed very tight, so he was laying underneath
the van removing them with vise grips...
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