Norway Posted April 24, 2014 Share Posted April 24, 2014 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... Quote Link to comment Share on other sites More sharing options...
Mike Posted April 24, 2014 Share Posted April 24, 2014 I would like to know also. Mine sounds like a steel shot ball rattling around inside my air tank.I figured if it was building air and purging then all is ok.mike Quote Link to comment Share on other sites More sharing options...
Rusty Bolts Posted April 29, 2014 Share Posted April 29, 2014 you might look at the filter on the compressor, to see if it came loose or fell off, had that happen to me just a thought . Quote Link to comment Share on other sites More sharing options...
Norway Posted April 29, 2014 Author Share Posted April 29, 2014 Don't think I have a filter. The air comes form the engine driver's side. There is a 1/2" steel tube and 2 silocone hoses to make the connection. Thanks Quote Link to comment Share on other sites More sharing options...
gearhead204 Posted April 29, 2014 Share Posted April 29, 2014 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 . Quote Link to comment Share on other sites More sharing options...
Norway Posted May 2, 2014 Author Share Posted May 2, 2014 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. Quote Link to comment Share on other sites More sharing options...
Norway Posted May 6, 2014 Author Share Posted May 6, 2014 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. Quote Link to comment Share on other sites More sharing options...
Freightrain Posted May 7, 2014 Share Posted May 7, 2014 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? Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
Norway Posted May 16, 2014 Author Share Posted May 16, 2014 Broken spring referring to unloader or turbo... Truck is still running great so I been working it.... Quote Link to comment Share on other sites More sharing options...
Norway Posted June 26, 2014 Author Share Posted June 26, 2014 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 ? Quote Link to comment Share on other sites More sharing options...
gearhead204 Posted June 27, 2014 Share Posted June 27, 2014 is the compressor fixin to throw a rod? as the eng. builds manifold pressure it makes the compressor work harder that would explain the increasing noise with manifold pressure Quote Link to comment Share on other sites More sharing options...
Norway Posted June 29, 2014 Author Share Posted June 29, 2014 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.... Quote Link to comment Share on other sites More sharing options...
Norway Posted July 4, 2014 Author Share Posted July 4, 2014 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. 1 Quote Link to comment Share on other sites More sharing options...
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