Totally, TOTALLY frustrated - Air compressor issue.

[Busted Knuckle]

OK...we're getting warmer.....who the heck is REI ?

It's who Chaz bought his compressor from.
http://www.rebuildersenterprises.com/

And not highly recommended by most here on the board. (several lucky ones have had OK deals with them, but more have not!)
  BK 

[Chaz]

Should there be two lines on the Governor? One to the EXH. (exhaust port( and one to the RES (reservoir post) ?? One should one just be capped off?

[luvrbus]

No the exhaust port is open 1 line goes the reservoir the other to the unloder port 

good luck

[bevans6]

Three ports should be in use on the governor.  one to the air dryer, one to the air tank and the exhaust port.

See the pic in the link:  http://www.beamalarm.com/Documents/haldex_d2_governor_service_data.htm

The reservoir ports are the ones farthest away from the plastic cap.  There are actually three of them, you have to plug the two you do not connect a hose to with 1/8th pipe plugs.  That port connects to your air system tank.  The reservoir port is how the governor senses the air pressure in the system

The unloader ports are the middle set, between the two mounting bolt holes.  You have to plug one, put the hose to your air dryer on one, and the final one is usually connected to the compressor by being bolted to the side of the compressor with a gasket if your governor is mounted directly on the compressor.  The unloader port tells the compressor to unload and stop delivering air, and it tells the air dryer to purge.

The exhaust port is on the underside of the governor, there is only one, not three like the others, and you just leave it open, you don't connect anything to it and you don't plug it.  Some installations you put a hose on it so it doesn't blow on anything important, but it is open to atmosphere.

So, you should have one line connected to the reservoir ports, and the other two plugged with pipe plugs, on line connected to the unloader port, and one plugged, and nothing in the exhaust port.  Total of three pipe plugs, two hose connections, and the governor bolted to the side of the compressor.

Makes sense?  probably not...  Hard to describe in words.

Brian

[luvrbus]

He doesn't have a dryer he only uses 2 ports,his exhaust port should pointed down with it on the top as shown in the photos it will never stay clean

good luck

[Chaz]

Thanx LUVR. I was just going to write that.
I have one hose connected, one port open and it's bolted to the compressor and an open exh. port.
I fired her up and it took 6 minutes to get to 80psi.  9min. 20 seconds to shut the buzzer off. That is about 95 psi or so. And about 16min. to get to max of about 120. That was all on slow idle. It still has the loud howl/hollow whistle noise coming out of it. Man, I wish i could find someone to hear it/check it out here.  It still can't be right. But....... the next thing is to clean the system as was recommended. Maybe that will help in some way.
Thanx for all the help guys, I really REALLY DO appreciate it!!!!!!!!!!!!!!!!
Guess I'll just send the first exchange compressor back and chaulk it all up as lesson learned.   
Chaz

[bevans6]

Did you plug all of the unused ports on the governor?  No leak at the governor anywhere?  If it's making a howl can you tell where that noise is coming from?  What kind of air cleaner does it have?  No restrictions?  Try taking it off and see what happens?  If you take the discharge hose off, does the air output seem good?  Does that change the noise in any way?

I am starting to be very  glad when I got my new compressor it was a genuine Bendix rebuild - because I had no clue about any of this when I bought it!
Brian

[Chaz]

Yup, all ports are plugged. No leaks. Noise comes from the inlet to the compressor (almost like it's pushing out as well as sucking in...sorta) No restrictions on inlet as I have it open to atmosphere. Discharge will push finger off after a couple secs. but little cfm. Noise does not change. That's the Cliff's notes version as I did all this and it's in earlier posts. But thanx for checking. Seems great minds think alike. 

I would be happy too. I'll not make this mistake again and, I am very hopeful others here will learn from my mistake. God knows I make enough of them.

[robertglines1]

do you still have the other compressor. or a differant one?

[Chaz]

   Not sure what you mean Bob, sorry.
I have the first rebuild I got from them, ready to go back. I also have the second one they (finally) sent as a replacement on the bus. That is the one I have been writing about.


(How was the "Frog's", Bob?)

[robertglines1]

little over 4200 cars.  was thinking the other one you have you could take apart and look at to get idea  or it might be better than new one..  by the way nice weather in 80's for frogs.  Bob

[Brassman]

Are the intake valves leaking?

[TedsBUSted]

. . . Noise comes from the inlet to the compressor (almost like it's pushing out as well as sucking in...sorta)

Time to check the check; check-valve, that is. After building a head of steam, with the engine stopped, loosen the discharge line to see if system pressure is leaking back towards the compressor.

So far, I'm not leaning towards a compressor problem. My hunch is that the first stop beyond the compressor, the cast manifold/moisture collector/cream separator, is crudded up.


Ted

[artvonne]

  For something that should be rather simple this is sure getting long. Im leaning with Ted, that sumthins amiss downstream.

  But look at the bright side, your problem has everyone head scratchin, so were all going to learn something if we pay attention.

[luvrbus]

He needs to run the engine at 1200 rpm to check the compressor idling at 500 rpm the 750 compressor produces about 1/3 of it's rating, air up must have been a problem on his bus in the past or he would not have the 750.
Great thing about paying 450.00 for a Bendix rebuilt compressor he could go to a Bendix dealer and get answers,independent rebuilders use very few new parts if they do use new parts they are some kinda of after market.
I was told by a GM bus mechanic that a 4905 holds 16 gals of air if empty on startup  


good luck