Air Compressor for an Cummins ISX question

Block your wheels, build air pressure to cutoff, shutdown the engine, release parking brakes and locate your air leak. Quite possibly a park chamber (maxi) leaking.

 

with the hood up standing at the drivers side front wheel, the air govenor is mounted to your right at the leading front edge of the firewall. seen the unloaders inside the compressor sticking alot. with the engine running and the compressor intake removed you can spray some penetrating oil into the compressor to free up the unloader valve. you need to spray about 1/4 of the can but not all at once make sure the compressor cycles a few times.

 

First thing I thought of was maxi but you should be able to hear it.

Does it hold air pressure when parked?


Ive never replaced a compressor so I would know the cost but a goveners ate cheap and easy

 

If you have an EGR Cummins you could have a massive air leak from the turbo actuator solenoid or the air piping to the turbo, or the turbo actuator itself. This solenoid is only energized when the engine is actually running, so leaks can be hard to find. This type of leak will not occur with the key off. If your system holds air with the key off this may be the culprit.

 

What Heavyd said, I had the same problem, thought it was the regulator/sensor /compressor, and it was the turbo actuator dumping air like crazy. It will not leak with the truck off to hear it, and when the engine is running and the turbo actuator is not activated, you won't hear the leak then either. But when it is leaking, you will not be able to build pressure.

 

post me a pic of compressor I can tell you brand and model to get spare parts

 

With air pressure built as high as you can get it, turn ignition key to run with engine off, check for air leak at fan hub.

Also closely check condition of main air line off of air compressor to 1st air tank and the connections.