| Author |
Message |
Bob (Bobb) (216.232.224.234)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 28, 2004 - 12:05 pm: | |
In checking for air leaks, I have heard a slight gurgling sound, accompanied by a faint breeze coming out of the compressor air intake.
Any ideas what may be wrong? |
James Maxwell (Jmaxwell) (66.81.57.238)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 28, 2004 - 12:15 pm: | |
If u are getting blow-back from the compressor, it can only be a faulty intake disc (bad intake valve) which also means it does not build pressure either. Means u need a rebuilt or new compressor. |
Bob (Bobb) (216.232.224.234)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 28, 2004 - 12:25 pm: | |
The compressor builds pressure just fine.
Could it be a leaking unloader valve? |
TWO DOGS (65.179.200.253)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 28, 2004 - 12:59 pm: | |
disassemble the D-2 air govenor on the side of the compressor..it's about the size of a pack of cigarettes & has a rocket ship looking thing on it...clean with liquid wrench & put it back together...replace any cracked o-rings |
Bob (Bobb) (216.232.224.234)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 28, 2004 - 3:00 pm: | |
ok will give that a try |
Tim Jones (Torquester) (12.73.176.53)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 28, 2004 - 8:38 pm: | |
Bob,
If you have a drier, there should be a check valve at the drier, where the compressor feeds into the drier. This valve is usually inside the drier and sometimes requires dissasembly of the drier. Replace this check valve and your problem should be gone. The unloader simply unloads the piston and does not prevent back flow from the wet tank. I wouldn't mess with the governer either as it simply tells the unloader what to do.
hth, Tim |
joe shelton (64.222.151.17)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 28, 2004 - 9:52 pm: | |
I agree with Tim; the governor is not worth messing with and a new one is around $20. But I'm not sure I agree that the unloader does not prevent back flow from the wet tank. The Bendix Service Bulletin SD-01-335 for the Tu-Flo 700 compressor says to check for leaking unloader pistons, "remove compressor inlet strainer or fitting. With compressor unloaded (not compressing air), check for air leakage." A faulty Governor can also cause this. But leaking unloader valves are no reason to replace your compressor. You can rebuild the compressor top end with a head kit for $50 or less. The kit for the Tu-Flo 700 is #289998 at $49.17 and includes the head gasket, discharge valve parts, & unloader valve parts. Can be done without removing the compressor which is not a small job (for me). Joe 4106-2119 |
BrianMCI96A3 (65.40.153.32)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 29, 2004 - 12:34 am: | |
I am not disputing anything anyone else has said on the subject but my first inclination would be to replace the governor before I did anything.
My reasoning is this: the governor is normally very easy to replace and cheap.
If you've solved the problem by replacing it...then it was a cheap and easy fix
If not, then you replaced something most people don't do anything to, until it causes problems... and they do... plus, it was cheap and easy.
You may need a check valve or some other repair, but that is where I'd start.
Brian |
joe shelton (64.222.151.17)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 29, 2004 - 6:27 am: | |
That's using your brain Brian. Had governor go out in Chicago traffic once, lost pressure, brakes locked, no fun. Now I keep a spare on board. What dose dispute mean? joe |
BrianMCI96A3 (65.40.153.32)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 29, 2004 - 8:29 am: | |
It means I did not disagree with anyone, Joe.
Brian |
Jimmci9 (209.240.205.68)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 29, 2004 - 5:10 pm: | |
look for a check valve in the air line... right next to the wet tank.. it's what holds pressure off the compressor... not the governor...the governor only controls cut-out and cut-in for the compressor... |
TWO DOGS (67.30.17.184)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 29, 2004 - 5:18 pm: | |
I agree with Brian,,,,,,,(never thought that would happen)............did you quit that job Jim..? |
Jimmci9 (209.240.205.68)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 29, 2004 - 6:31 pm: | |
still alive and well working for mustang... the caterpillar dealer in houston tx...but prolly headed south to corpus or the valley before the winter... |
Steven Gibbs (12.148.43.7)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 30, 2004 - 6:22 am: | |
The governor does one other thing; it opens the purge valve in the air dryer discharging all pressure from the dryer (hopefully along with oil and moisture).
As such, the check valve is located on the outlet of the air dryer to prevent pressure from the wet tank from escaping back into the air dryer and out the purge valve.
There should then be no air pressure to leak back through the air compressor. That would seem to indicate that the source of the backflow is the compressor and would have something to do with the unloading valves.
The governor receives air pressure from the accessory side of the air system to control pressure. The governor opens a valve to allow air pressure into the unloading valve port on the compressor and this air could be leaking back through the unloaders or compressor valves to the intake. However, this should only occur during the unloaded cycle.
Air is important for operation, so all of the suggestions--replace governor, rebuild compressor headend, and service/replace air dryer check valve (along with replacing dryer cartridge) should be performed as a good PM since you probably don't know when these items where last serviced.
HTH,
Steve G.
MC9
Pontiac |
Buswarrior (Buswarrior) (64.229.212.164)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, April 03, 2004 - 10:30 pm: | |
Hello Bob.
I don't know what is wrong with your air system.
I'm feeling left out, so here's another suggestion:
If you buy a whole new bus, won't that surely solve any problem you are having with the current one, with a lot less unneccessary work?
ROFLMAO!
happy coaching!
buswarrior |
Bob (Bobb) (69.19.0.1)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, April 03, 2004 - 11:17 pm: | |
Yes, you are right. I could just buy a new bus, and be free of all of these problems. But really, what fun would that be.
Thanks to all of those who offered real suggestions to solve my problem. Still working on the leaks, and I will get to the end of them sooner than later. Just waiting for parts from MCI.
Hope to have the bus rolling again tomorrow, complete with current air leaks. I rebuilt the air cylinders that control the dampers on the blower today... boy do some people have weird ideas on how an air cylinder operates. One was assembled completely backwards. They both work now.
Bob
http://www.shadowhost.com/mci/conversion.html |