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Air Compressor pumps oil


JoeH
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1979 R686ST, endt676 motor.

Over time the air compressor pumps a real thick tar into the wet tank. Probably generates 1 gallon of it per 2 months. 

Rebuilt compressors don't fix it. Been doing it for years.

What is going on???

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Air compressor inlet come from the air cleaner tubing?  Pull that line and see if it is oily.

You say the compressor is rebuilt and it didn't change anything?  If it is not sucking oil on the inlet, then it has to be coming from the pump.

When mine needed rebuilt, it only made oil milkshakes(water, oil, foam), not tar.

IMG-20180116-202556-655.jpg

Larry

1959 B61 Liv'n Large......................

Charter member of the "MACK PACK"

 

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2 hours ago, JoeH said:

1979 R686ST, endt676 motor.

Over time the air compressor pumps a real thick tar into the wet tank. Probably generates 1 gallon of it per 2 months. 

Rebuilt compressors don't fix it. Been doing it for years.

What is going on???

If you got one of those little  donut air filters on there ditch it  and plumb it in to the main engine  air inlet or the inlet manifold that will turbo charge  it! !

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Really?  On the boost side?  Never really thought about that.  Would that really work okay?

I still run the little box filter on the side of the pump.  I've contemplated changing it over to the air cleaner pipe.  I have the plate to convert it, as it came on the 237.  I just never plumbed it so I used my old 673 filter.

IMG-20180116-202556-655.jpg

Larry

1959 B61 Liv'n Large......................

Charter member of the "MACK PACK"

 

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My 8.3 Cummins I just bought is plumbed right into the intake.   It has a valve”forget the name” on the air compressor where the small filter would be,that limits the amount of pressure it will take so it doesn’t take all the turbo boost on a pull

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I'm chasing a similar issue on the RD (E6-350).  Compressor intake is on the boost pipe between the turbo and CAC....

Could that be the source of the trouble?  It became a problem when the boss man road tripped it to Alberta from southern Ontario a couple years ago, and the compressor was replaced (not sure if new or reman)....but theres still oil being pushed through sometimes....

The air dyer has been replaced twice...and it still sneezes oil sometimes....

 

Sorry OP; didn't mean to hi-jack your thread.... :)

Lack of planning on your part does not constitute an emergency on my part....

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Your problem. Is my problem, not a hijack!

I'm suspecting the "rebuilt" compressors are not actually rebuilt. I've popped at least 2 in trying to fix this, still does it.

Are you sure your intake is from the boost side of the turbo? Or is it between the filter and turbo? I was hoping that turbo'ing the compressor would solve the problem, but if that's how yours is set up then it sounds like it won't....

Dryer isn't an option for me, I can't snot oil all over rich customers driveways. Frequently parked on driveways for 45 minutes, being a concrete truck...

Edited by JoeH
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