MC8 Air Compressor

[bear355]

  When we parked our coach last weekend everything was fine.When we went to leave Friday night to go play some music we have no air pressure.We took the valve apart and cleaned it.Any ideas.Is this a big job to swap out ? Does anyone near the Atlanta area have a good used one.Will any comp off of a 8V71 work on this coach or does it have to be off of an MCI?

[Dreamscape]

I lost the air compressor on my 68 Eagle 01 last December in Palm Springs Ca. A fellow busnut brought me one that was an exact match. When he took it apart he discovered the key was broken on the shaft. I'm not sure which setup you have, it might be similar to mine. It took about one hour to take it off and replace. I did replace the govenor with a new one, thinking that it could have been the problem. It was only about $25 new, and easy to locate at a parts shop. As this was my first experience with this type of problem I was not sure how to go about troubleshooting it.
Get the numbers off the side, it should be a Bendix. Make some phone calls to some truck repair shops and see if they have a match. It should not be too difficult to find a match. You might be able to locate a good rebuilt unit, but I would try for new first.
Sorry I don't have any phone numbers to help you with in locating one.
Do you have the Bus Garage Index? It lists most all shops in the US that you might be needing help when traveling, its only $40. I don't have one or I would look it up for you. You can get it here http://www.busride.com/. I plan to get one soon myself before our next outing.
If you are sure that is the problem you might go ahead and remove the unit, could be an easy fix.
Which valve did you take apart and clean?

Other board members with more experience will be able to help more.

HTH,

Paul

[bear355]

   Two of the band members took the governor apart and cleaned it.At the same time they found  the ground wire on the altenator had cam out of the lug and the batteries were down so, they did not get to run the bus after the cleaning to check it out.
  Were in the keyway you speak of?

[Dreamscape]

If the compressor is mounted on the rear of the engine as mine is, you have to remove the compressor from the engine. Then look at the shaft. Do you know for sure it is not putting out air? Do you hear any leaks? Check it out with a spray bottle of soapy water.


I'm not familiar with MCI's. I'm only giving you suggestions on where to look until some other help is offered from members of this board.
Paul

[Sammy]

Before you take the air comp out, I would visually check the air comp unloaders. If they are not seated properly it won't pump. They are located under the air intake flange,which has a hose to the air filter housing and 2 bolts securing the flange to the air comp.The D2 governor controls these unloaders.
If the unloaders are seated properly, disconnect the main air line at the air comp,run the engine to confirm you have no output from the air comp.You can run the engine for a minute to see if there is any output from the air compressor.
REMEMBER: You will have to manually move the lever on the governor cover to shut the engine off - there will be no air pressure to do this - no disrespect intended.
Let us know your progress, can provide more help if needed.
Good luck. 

[bear355]

  We will do some checking on Mon. evening and I will let you know.

[Jerry32]

I had this info for a tf 700 $268 at REI Brake Supply 800-489-9860   Jerry

[bear355]

 The batteries show 12volt plus on each but the moter just barely turns over now so I am not able to test the compressor right now.The number on the comp. is T2 92878B.I may need a starter next who knows?

[bear355]

  OK, We replaced the starter and it starts great now.We also put a new DD2 govenor on the old girl at a cost of $18.00 still no air.Anyone have a good compressor that will work for sale.This is a 1974 MC8 w/8V71

[ChuckMC8]

Bear, I think that I have one- and I'm colse to you! Shoot me an email 14bama@bellsouth.net  Chuck