Air compressor rebuild

Did you look on Quickserve? There should be a schematic

If not, Cummins should be able to print out a schematic and parts list for it, they did for mine anyway

There are a few kits for them. I'm not familiar with that model but there should be a top end kit with all the gaskets and seals

 

Make sure you time it properly

 

On the 855 it's supposed to be timed. The N14 isn't that much different

There's a mark on the front of the air compressor crankshaft. That's set at the 10:00 position and the accessory drive pulley on the "A" mark

It's not that big of a deal to do. I'd say if your compressor has a mark do it. If it doesn't have a mark don't worry about it

Mine wasn't timed correctly when I bought it. I noticed a difference when it was

 

Probably just the gasket. If head and body are flat and not erroded replacing the compressor head gasket would probably fix it.

 

Probably not what you want to hear... But I recommend you replace the compressor. Run it if you are able to and keep an eye on the coolant. Because the head could be cracked or warped. Head gaskets are always more that just replacing the gasket.

 

Be sure to put a new safety pressure release valve on the new one. I don’t see one on old one. My first Truck didn’t have one. Used to carry a spare head gasket in glovebox, till one day I figured it out, Lol. Frozen line, bad governor, whatever. Avoids blowing a gasket, or damaging new compressor. Not sure what’s a common size, maybe around 200 lbs.maybe higher. Should be a suggested spec or standard. Put it in place of any one of the plugs in the head.