1979 MCI MC9 Air System Schematic

[Jamieriendeau]

Hello Everyone,

I have recently purchased a 1979 MCI MC9 conversion from my Aunt and Uncle So my fun is just starting! Soon after, the Bus was not airing up anything downstream of the PPV(park brake wont release...bus wont shutdown with switch...no suspension or accessories). After some troubleshooting with a smoke machine i have found that an air line corroded and came apart down steam of PPV where it heads to back end of bus. Just working on repairing that fitting and can see if it airs up without any issues. My issue is during the troubleshooting the air schematic in the Original manual is so blurry its very hard to follow or understand the air system at all and wasn't much help.

Does anyone know where i can find or purchase a detailed clear Schematic for the 1979 MC9 Air System? 

Any help would be greatly appreciated!

[Coach_and_Crown_Guy]

Do a search online and you'll find sites with complete service manuals in pdf format. Download and enjoy. You should also search for Bendix air systems theory of operation, descriptions and parts for a fundamental understanding of how air systems work in trucks and buses. These can easily be found and are available for free download directly from Bendix.  MCI uses the same components placed in different locations in the bus, which will be described in the specific MCI model maintenance/service manual. You should also bite the bullet and find and buy a printed hard copy of the manuals as well to go with the pdf version which is almost always never as clear as the real printed hard-copy book. You can always get one directly from MCI but it will be full retail..... The air system and brakes is section four by the way.

[peterbylt]

I had saved this link years ago, was surprised it still worked.
MC9 Service manual.
http://busrvparts.com/MCI_Manuals.htm

Peter

[Jamieriendeau]

Thanks for the info guys,

Yes I do have the manual, seems like it's a legit version but the air diagram is still only about half legible, lots very blurry. Is this just the best it gets? Or maybe I have a knockoff copy.