Oil coming from the blowdown muffler on Sullair

Oil blows out of the separator or sump muffler on Sullair LS 12, 50 hp screw. I changed the separator, rebuilt min. press. valve and rebuilt the pressure regulator.

Comments for Oil coming from the blowdown muffler on Sullair

Click here to add your own comments

Jul 21, 2016
by: Anonymous

I was told by a Sullair tech not to run this older unit load/unload. I cleaned the pressure regulator which had some oil build up inside and adjusted so unit will run in Modulation. I'm not sure why some pressure remained in control lines after shutdown.Running 2 days so far

Jul 18, 2016
Oil leak
by: Anonymous

The vent valve or blow down valve that silences the air during unload. All parts look good in side the valve. What about the solenoid valve, could that cause it.

Jul 14, 2016
Blow down muffler
by: Carl

I think what you're describing as the blowdown muffler is the vent valve, if you dismantle it, you will find a diaphram, it sounds like it might be split, replace that and you may find the problem.
Let us know


Jul 13, 2016
by: Doug in s.d.ca

Please use Sullair nomenclature to describe your problem.

I don't know what "blowdown muffler" means.


Click here to add your own comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Sullair Air Compressor Issues.