Oil in intake M923a2

[SteveJennings]

Truck is a M923a2, just turned 10k miles on a Camp Shelby rebuild, Only got about 2000 miles out of a new air compressor I put on couple years ago. When I started to open it up the unloader valve was all gunked up. Only thing I can think of is it’s pulling oil along with air from the intake. Any idea what could cause this?

 

[SteveJennings]

This is not a bump, just a screwup that I can’t delete

 

[silverstate55]

It’s possible that your air dryer is plugged, causing excessive back pressure (seen it a few times). Air dryers are commonly overlooked on these trucks, when is the last time it was serviced?

 

[SteveJennings]

It’s possible that your air dryer is plugged, causing excessive back pressure (seen it a few times). Air dryers are commonly overlooked on these trucks, when is the last time it was serviced?

It was put on new about 1.5 years ago. Still blows off nicely, no excesss air pressure.

 

[SteveJennings]

Any other ideas on how I’m getting oil in intake of compressor? Maybe turbo?

 

[simp5782]

Any other ideas on how I’m getting oil in intake of compressor? Maybe turbo?

What part of the intake has oil in it.

 

[SteveJennings]

What part of the intake has oil in it.

Not sure. Inside of hose from intake to compressor is coated in gummy oil substance. And unloader valve also coated in gummy oil substance. Compressor had very low hours/miles and already failed due to unloader valve sticking.

 

[simp5782]

Not sure. Inside of hose from intake to compressor is coated in gummy oil substance. And unloader valve also coated in gummy oil substance. Compressor had very low hours/miles and already failed due to unloader valve sticking.

Cause it's not cutting off under boost and it is being pulled from the compressor thru the hose

Block that intake port in the tube. Then run the Inlet hose up somewhere and put a filter on it.

I had to do this on mine cause or the high boost I am pulling. Or you may have an air inlet restriction from your stock filter

 

[SteveJennings]

Cause it's not cutting off under boost and it is being pulled from the compressor thru the hose

Block that intake port in the tube. Then run the Inlet hose up somewhere and put a filter on it.

I had to do this on mine cause or the high boost I am pulling. Or you may have an air inlet restriction from your stock filter

Thanks I’ll try that. You remember what filter you used? Something like this?Filter

 

[simp5782]

Thanks I’ll try that. You remember what filter you used? Something like this?Filter

Like that but your hose is probably a 1 inch for the suction line