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Ticking Noise In Air System


Norway
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During the charge / purge cycle I have this problem.

Air dryer purges at 120 or so and the truck holds air fine. As you consume air and the pressure drops towards 100, before the beginning of the charge cycle I get a ticking noise. The sound level is directly related to the amount of boost in the turbo. The noise is like when you'd put a baseball card in your bycycle wheel, and the harder you step on the gas the louder the noise gets. As soon as the compressor starts to build pressure the noise goes away. Truck runs fine and I get my full 33 or 35 LBS boost. It's just annoing and I don't believe it's right.

I have recently replaced my govenor and put in a "chepo" but new AD-9 drier. The reason I put in the new drier was the old one had some miles, purge valve and desciant had been replaced once and was making the same noise so I just figured I get rid or the problem with a replacement... Not so...

Thanks Rob...

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I think your supply air for the compressor comes from the eng intake air, that said does the truck build air in a timely manor? if not you may have a failed valve in the compressor. you could try a d.o.t. compressor recovery test to see if compressor is functioning in a safe capacity .

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Every thing is fine with the system and it builds and holds air great. It was suggested that the compressor unloader is gunked up. I'm going to remove the intake line this weekend and see what the insides look like. Dirty there.... good possibility dirty inside compressor.

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Well, started to take off the intake line and that wasn't going to happen on a Sunday when the truck was going to work Monday. It's a PITA to get at so unless I get sone other ideas it's going to stay that way for a while.

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I wonder if it has anything to do with the unloader valve in the compressor? It makes noise, til you start making air? Wonder if the turbo boost air is affecting the valve itself. Broken spring?

IMG-20180116-202556-655.jpg

Larry

1959 B61 Liv'n Large......................

Charter member of the "MACK PACK"

 

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  • 2 weeks later...
  • 1 month later...

Ok. Haven't solved problem but I did remove the steel line for the air intake and it was gunked up. So I replaced the top of the compressor and It still does it. Didn't mind the investment. The top of compressor was gunked too. However, it won't do it in a parking situation it will tick as your going down road and as the turbo builds pressure it definately gets louder and softer corresponding with turbo pressure.

I'm going to look for check valves and air leaks before the air dryier.

Any other thoughts ?

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Thanks for the reply. Don't think so. It only happens as the system air pressure drops and i'm with in a couple 3 lbs of compressor kick cut in. Like 103 to 105psi. As soon as the compressor cuts in or any other time it's fine. Had truck at the Mack dealer they said that they would have to isolate eack componet and test.....

I figured I check in one more time here....

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Finally something changed. Heard air leaking around newly intalled govenor. I replaced the govener and the 1/4" line that runs from the govenor to compressor ( all I had time for had to go to work ) and that fixed it.

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