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 on: March 28, 2015, 08:48:06 AM 
Started by TheHollands! - Last post by bevans6
You have a leak in the accessory air system, AKA the air system downstream of the pressure protection valve.  Included are all of the suspension, the emergency/parking brake system, all the engine accessories, air door if you have one.  Fast idle is part of the engine accessories and so will not work.  the engine stop system is also part of this, and may not work.  You may have to turn the engine off on the dash, then go back and manually kill the engine with the engine stop lever (assuming it's not a DDEC engine).  then you just need to find and fix the leak, easier said than done, but still required...


 on: March 28, 2015, 08:45:50 AM 
Started by olebusman - Last post by TomC
V731 is electronic. I assume you have all the electronic shifting stuff. Why not just get it rebuilt? Good Luck, TomC

 on: March 28, 2015, 08:43:06 AM 
Started by Gary LaBombard - Last post by TomC
Hopefully with all the work you put into the engine, it will last many years without problems.

The whiney noise is the open air intake and the blower noise. Very distinct sound. Good Luck, TomC

 on: March 28, 2015, 08:42:23 AM 
Started by luvrbus - Last post by Timkar
Gonna park them alongside the Hummers Clifford ?   Grin Grin

 on: March 28, 2015, 08:33:53 AM 
Started by TheHollands! - Last post by TheHollands!
The parking brake is on and I'm losing the air down to about 65 lbs. Also the fast idle all of a sudden stopped working at the same time.

 on: March 28, 2015, 08:25:50 AM 
Started by TheHollands! - Last post by Jon
Not enough information. If you have the emergency (parking) brake applied and you are losing air you have at least two issues. You have a protection valve problem possibly and you have a leak that is likely not associated with the brake system unless the leak is a relay valve or associated with the brake treadle.

If the parking brake is released and you cannot build air you could have a failed spring brake diaphragm.

Regardless you should be able to hear the location of the leak.

 on: March 28, 2015, 08:15:11 AM 
Started by TheHollands! - Last post by bobofthenorth
Its pretty hard to troubleshoot something like this from a distance but if it aired up normally and then happened all of a sudden while you were moving it sounds like you are losing a lot of air somewhere.  You should be able to hear it escaping but maybe not over the sound of the engine.  Air it up as much as you can, shut it down and listen.  Then figure out where its coming from.

 on: March 28, 2015, 08:08:46 AM 
Started by TheHollands! - Last post by TheHollands!
Hey guys, I had the bus running this morning MCI-9 6v92T was moving it into position and couldn't release the emergency brake. Had been moving it for a few minutes previously. Saw the air was lowering so put it in Neutral and the fast idle was no longer working and I could see I was losing air. If I hold the throttle I can keep it at 80 lbs but get it no higher, soon as I release I lose pressure. So I'm stuck. I'm a beginner mechanically trying to learn what I can. Any ideas? Thanks, Craig

 on: March 28, 2015, 07:49:50 AM 
Started by Gary LaBombard - Last post by Paso One
Awesome Gary  So glad for you,

 on: March 28, 2015, 07:32:43 AM 
Started by boxcarOkie - Last post by boxcarOkie
A little more bus porn from the Pahrump Rally if anyone wants to see it.

Things You Should Never Do At A Bus Meet


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