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Rattle noise 2015 IHI Cummins?


Orcas Tow
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New to me 2015 IHI Durastar with a 6.7 Cummins/Allison 2500RDS, air brakes with 15,000 original miles.

 

I bought this truck a couple weeks ago from Missouri, had an International Dealership perform a buyers inspection for me prior to purchase, they said all was like new. Truck was shipped on a semi trailer to me here in Washington.

 

On maiden trip I noticed air compressor was a bit noisy but not alarming, noise is like drumsticks rattling on engine block when engaged at idle, noise goes away when compressor disengages/120psi. When driving the noise returns on acceleration, same volume & noise as when compressor is building air but all the time when accelerating, even when the compressor is not building air. Let off throttle & noise goes away 100%.

 

Took it to the local International Dealer, asked a tech to go for a spin with me, he said not normal. I left truck for diagnosis, still under factory extended warranty, 6 days later dealer says noise is normal. I agreed noise is normal when compressor is building air but when its not it should not be making noise when its disengaged, only when acceleration.

 

Any thoughts or suggestions? Thanks

Hello from sunny (when its not raining) Orcas Island

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Thats a good question, from inside the cab it sounds identical to the Air compressor rattle & I can not duplicate the noise while stopped, only while moving/accelerating. It will not do it power braking it in gear at a stop.  I will look into that, thank you.

Edited by Orcas Tow

Hello from sunny (when its not raining) Orcas Island

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  • 2 months later...

Follow up. Cummins rear gear driven Wabco single cylinder air compressors are noisy due to their being gear driven off the bell housing area, the gears clatter/rattle, not a wear issue but a bit too noisy for my "mechanic ears".

 

Cummins has a TSB to re clock compressor gear (which I did) for excessive gear rattle noise at idle but nothing about under load.

 

I did some hard thinking as to why this would make the same rattle when the compressor was disengaged but only under load with throttle applied, whats the difference, turbo pressure?? 

 

These air compressors take their fresh air from the turbo intercooler tube just prior to the intake manifold (under pressure when under load & the turbo is in play, my other trucks take the compressor fresh intake from the air filter housing-not under turbo boost). I disconnected the air intake from the intercooler, plugged the intercooler bung, re routed the fresh air intake to the air filter housing & the compressor noise under load is all but gone. The compressor piston being loaded under turbo boost pressure was causing the drive gear to unload & make the noise. The air does not come up any slower & it was a simple modification.

Hello from sunny (when its not raining) Orcas Island

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