[T3] Injector gas leak into engine oil?

Mike Fisher fisherfarms at gmail.com
Thu Jun 15 13:06:27 PDT 2017


Plugged up metal fuel return line in the tunnel will force gas into the
oil.  BTDT!

On Thu, Jun 15, 2017 at 1:01 PM, William J <catnine09 at dslextreme.com> wrote:

>  I would think if you had a leaky injector for gas to get in the oil the
> intake valve on that cylinder would need to be open since the injectors are
> right on the heads. I can't say how much fuel would leak out until the
> syslem pressure dropped low enough.
>
> The fuel could sit long enough to leak past the rings yet if this were the
> case on start up you would see a cloud of black smoke out the exhaust from
> what ever fuel still in that cylinder.
> ----- Original Message ----- From: "Jim Adney" <jadney at vwtype3.org>
> To: <type3 at vwtype3.org>
> Sent: Wednesday, June 14, 2017 5:26 AM
> Subject: Re: [T3] Injector gas leak into engine oil?
>
>
> On 14 Jun 2017 at 3:40, J. Jonik wrote:
>>
>> Re/ 71 Std Sqbk:     Slight smell of gas but not a wet hose to be found
>>> anywhere.
>>>
>>
>> Smell of "gas" inside the car is most often due to exhaust getting inside.
>> Usually this is caused by leaking exhaust connections at the lower heat
>> exchanger to muffler connection. Is your heater turning off? Does the
>> smell
>> get worse if you turn the heat on?
>>
>> Suspicion is that an injector may be leaking gas into engine oil.
>>>   Hard to tell if oil at dipstick smells gassy.
>>>
>>
>> There's no way for gas to "leak" directly from an injector into the oil.
>> If the
>> system is running rich, we can get excess gas that makes it's way down the
>> cylinder walls and into the gas, but that's generally not the fault of the
>> injectors.
>>
>> Check your gas mileage. If it's bad, much less than 20 mi/gal, then there
>> are
>> other possibilities: most commonly a worn out voltage regulator. There's a
>> simple test for that if the gas mileage is bad.
>>
>> Any trick to test injectors for possible leakers?
>>>
>>
>> Unbolt them from the manifold but leave them connected to the gas lines.
>> Run the fuel pump for a few minutes and watch for leaks. An occasional
>> drip
>> is no problem.
>>
>> Or you can find a shop to take them to that can clean them. The cleaning
>> cycle also checks for leaks.
>>
>> And, any way to assure that any replacement injectors (salvaged from long
>>> gone cars) are ok?    Some oldies have been kept sealed in jars...no drying
>>> out.
>>>
>>
>> If they've been stored in kerosene they are probably okay. You can always
>> take them to a shop for cleaning, as above.
>>
>>  Or should we just change up to New Injectors (from our local VW shop)
>>> every five years?
>>>
>>
>> That would be expensive and silly. Most of my injectors are still the
>> originals.
>> Except for the hoses, which can be replaced independently, they don't tend
>> to wear out.
>> --
>> *******************************
>> Jim Adney, jadney at vwtype3.org
>> Madison, Wisconsin, USA
>> *******************************
>>
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>>
>
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