Jump to content
JoeH

Air Compressor pumps oil

Recommended Posts

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???

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites
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! !

  • Like 1

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

Not sure if I would plumb it in on the pressure side of turbo, all the older mack engines with turbos I have seen had it between air filter and turbo.     terry:MackLogo:

Share this post


Link to post
Share on other sites

It's set up as Terry stated. My e7 runs off the turbo side, but the endt676 runs it off the suction side between turbo and filter.

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

If air filter is plug the motor needs air those individual air filters pick up a lot moisture .

Share this post


Link to post
Share on other sites

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.... :)

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...