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Old 04-03-2021, 12:55 PM   #1
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Year: 1995
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Engine: 5.9 cummins
Need help!!! Air compressor on ISB

So I've got a 95 bluebird bus with an ISB and air brakes. While idling I heard a rattling and then a clunk and lost all air pressure. I saw the air compressor jumping around and slapping the engine and then I shut off the engine. Below are some pics of the A/C. What could have caused this???? Are these just threaded studs? Why would they fail? Do I need to re-thread the holes now? What should I do? I got the top bolt/stud off. Bottom one is hard to reach.
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Old 04-03-2021, 02:08 PM   #2
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Darn. That is a problem.


I would think the whole air compressor needs to be removed, and the gear for it that meshes with the gears in the front motor cover should be all checked for broken teeth or other problems.


At that time, check the threads in the front motor cover where that stud came out, and make sure they are not stripped. If it is stripped, I can't say what is best without seeing it, but maybe drill it out (keep drill shaving out of the motor oil!!!!!) and add threadserts (I think I am calling them correctly). If the outer 1 or 2 threads is a bit damaged, a tap should do it. Use Locktite thread sealant (probably the Red/strong/permanent) on the stud itself where it goes into the motor cover, and then Locktite (blue/easy to remove) on the nuts when you replace the compressor.


If the power steering pump is on the back of the air compressor, make sure that didn't take a beating also.
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Old 04-04-2021, 05:23 PM   #3
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Got er out! It was a mother. What do y'all think of the teeth? Is there a way to check the timing gears without taking the cover off?
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Old 04-04-2021, 10:20 PM   #4
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First, before I forget, pic #4 & 5 seem to show missing threads in the stud-hole on the "left" (can't tell if that is the top or bottom, I think top).


The gear on the compressor doesn't look too bad. If the compressor itself is in good condition, considering the cost of a rebuilt one, I would personally take a small fine-tooth metal file and make sure the surface of each and every tooth is smooth (thoroughly clean all filings off the gear with a soapy solution - let none get back into the motor). The little groove that got cut out shouldn't hurt too much.


But then if you have any signs of oil coming out of the wet-tank air/water-release valve, maybe it's time for a new (rebuilt) compressor anyway. My "new" one is much quieter, also.



I would guess that the corner edge of the motor's drive gear caused that groove. I would look carefully at that. Turn the crank by hand little by little if you have to, to see every tooth. Again, small imperfections can be filed down (use a magnet to catch the filings from going into the motor, and again, wipe the gear with soapy rags to make sure you get all filings out)



I can't tell for sure, but it looks to me (on my motor and your pics) that the motor's drive gear spins the compressor gear, and the compressor gear spins the other gear. That other would be my high-pressure diesel injector pump. Not sure if that is your injection pump also. Seems like that would cause the motor to stop if the compressor gear disengaged from the injector gear.


But all that means you should check that other gear also. I'm not sure if you could get it to spin by hand (or with a pry-bar or screwdriver acting as a pry-bar).


Good luck!
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Old 04-04-2021, 10:28 PM   #5
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Don't forget you will need a new gasket for install.


I just replaced mine last month.



I thought I had a part number for you, but it's not on the invoice I got from the dealer....HMMM


My rebuilt compressor (by Bendix) came with a new gasket that was different from the OEM one, and tore, so I'm glad I had ordered the extra.
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Old 04-09-2021, 02:46 PM   #6
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Heater hose????

Which heater hose goes to which fitting? I can't remember!
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Old 04-09-2021, 02:59 PM   #7
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Did you repair the threads in the timing case?
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Old 04-09-2021, 04:09 PM   #8
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Quote:
Originally Posted by Micahkremer View Post
Which heater hose goes to which fitting? I can't remember!
If you are talking about the engine coolant hoses going into and out of the air-compressor head, I don't think it will matter. Just as long as coolant flows through, I don't think it makes a difference which direction if flows through the head. Maybe I'm wrong.....


Mine had steel tubing hard lines. Can't mix them up.
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