International Eagle 9400i - Problems to build up pressure

Thanks HeavyD.... I do have a 435 ISX and in this case the air seems to leak regardless if brakes are on or off or motor on or off ....if I dont rev up motor secondary loses 30 lbs within 15 seconds everytime... this leak has us just about pulling our hair out .... do you agree that it is not likely compressor head causing the blow back to compressor being only secondary is leaking ? I will have him check turbo lines etc as we didnt think of those ....but if it was a air bag or line leaking would it cause the blow back to govenor ... Im leaning toward a stuck or worn out check valve restricting or allowing air to escape back to govenor from the tank but not 100% sure as it makes sense but could be something else and Im no deisel mechanic. We did replace 3 of the four rear air bags ...4th one doesnt appear to be leaking.

 

Sorry, I have had a few drinks.. What do mean by compressor blow back? Where are you seeing air leaking at the compressor head? But yes, I think your ultimate problem is in the secondary system somewhere. Any air operated accessory, device, or component is secondary. The only thing that works off of primary is basically the rear axle brakes.

 

I meant the govenor is getting blow back.... it is connected to the compessor tho and there is a hiss coming right from there which is constant...compressor does not seem to be leaking and so probably the sound is from govenor although when finger is placed over the bleed hole that seems to be blowing air constantly I still hear the noise, there is a air bubble when sprayed coming from where you adjust the air under black cap so perhaps that is where noise is coming from but its hard to tell and we were told it could be blow back due to a bad check valve at tank but my mechnics troubleshooting method of clamping off the lines one at a time has him thinking its not because secondary still lost air regardless.

 

Ok, I see. Well if that governor is leaking like that I would say the governor is bad. Shouldn't be leaking like that. The governor will get system air pressure from the wet tank, so it normal for air pressure to be at the governor, but not normal to leak like that. The black line should be the one from the wet tank, the silver will be the signal line to the air dryer. The silver is just a signal line for the dryer to purge. To rule out the governor, just block off that black line at the governor. If your secondary system is still leaking down, then you have a leak somewhere else. It is possible that the governor is leaking really bad, plus the check valve for the secondary system is bad, and that is why it is leaking down. Air leaks are way better to deal with than oil leaks by the way, LOL!

 

If it is the govenor then I got 2 bad rebuilt ones in a row .... I am not sure if machanic tried that with black line....will know tomorrow but I think he might have already. Im leaning to check valve at secondary tank although he didnt think so after clamping off lines. Doesnt seem like you think it would be compressor either ....seems like it would do it all the time if it was or is it possible something is going bad there as well ?

 

Heavy D....found out it was the Turbo air accuetor pump under the compressor that was causing the problem....found one at wrecker for $250 and it did the trick....dealer wanted $800 for a little box like that which should have a rebuild kit but doesnt.

 

Cool, thats good to hear! Yep, no rebuild kit for those and they are expensive!

 

The problem is that you have a 9400i. The SAME THINGS happen to ALL of them.After you fix that, the turbo will blow. After you fix that the a/c will die. Then the air suspension will malfunction.And then......and then......

 

Boy, I know that's right!!! I bought my 2006 9400i with 440,000 mi, sense then I have replaced 3 air dryers, 1 air compessor, 2 regulators, 1 actuator, 1 turbo, 1 clutch fan assembly, 2 brake chambers, 2 check valves, and about 20 different things that I have forgotten about. we now have 610,000 mi. now. It currently wont build over 30 lbs pressure and the horn blows while trying to fill tanks. WILL SOMEONE SHOOT ME PLEASE!!! International dealer told me they use these trucks to haul off broken down Pete's and KW's. If I loved liars I would hug their necks!!!