Noise when letting off the accelerator

Alpha009 · Sep 7, 2023

I am having similar issue on my 2015 KW T680 13 speed, as I just changed the mid U bolt yet still I have a cranking noise at around after 65 miles and up, I am wondering the same thing what could it be yet this form appears to be helpful and I am also going to get others parts inspected well once more, yet please kindly share more feedback as to beside yokes in the center where U bolt was changed just few days ago, are there yokes at front at rear end as well? And what about drive seals, do you think they could be causing noise? If so, how are they inspected? Please advise.

TruckerLeaks · Dec 28, 2023

CHenk said: ↑

I have a 2015 Kenworth t680 with an MX13 and now an 18 speed. I have owned the truck for 2 years and ever since I've owned it I get a noise when letting off the accelerator. It sounds like it's coming from under my feet when driving. It's just a very brief clunk that occurs when cresting a hill or letting off the accelerator. The noise is never consistent and it happens randomly. Sometimes I can go a day without hearing it and others it happens frequently. I always thought it was coming from the transmission but the original 13 speed tranny that was in the truck failed and I replaced it with the 18 speed and the noise still occurs. The clutch was replaced when the transmission was replaced but off the top of my head I am unsure if the flywheel was touched. I'm hoping that if the flywheel needed replacing the mechanics would have done it too when the clutch was done but you know how that goes. I'm just looking for ideas on what to check out since I'd like to not keep pushing my luck and end up on the side of the road somewhere in the future. I have an audio file of the noise but this site won't let me upload it. Thanks in advance.
Click to expand...

Its your oil pan gasket. It needs to be changed.

TruckerLeaks · Dec 28, 2023

CHenk said: ↑

I have a 2015 Kenworth t680 with an MX13 and now an 18 speed. I have owned the truck for 2 years and ever since I've owned it I get a noise when letting off the accelerator. It sounds like it's coming from under my feet when driving. It's just a very brief clunk that occurs when cresting a hill or letting off the accelerator. The noise is never consistent and it happens randomly. Sometimes I can go a day without hearing it and others it happens frequently. I always thought it was coming from the transmission but the original 13 speed tranny that was in the truck failed and I replaced it with the 18 speed and the noise still occurs. The clutch was replaced when the transmission was replaced but off the top of my head I am unsure if the flywheel was touched. I'm hoping that if the flywheel needed replacing the mechanics would have done it too when the clutch was done but you know how that goes. I'm just looking for ideas on what to check out since I'd like to not keep pushing my luck and end up on the side of the road somewhere in the future. I have an audio file of the noise but this site won't let me upload it. Thanks in advance.
Click to expand...

If you haven’t figured it out yet. Its your oil pan gasket that needs replacing.

little cat 500 · Dec 28, 2023

probably jake brake lol

AModelCat · Dec 28, 2023

TruckerLeaks said: ↑

Its your oil pan gasket. It needs to be changed.
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?

Star Rider · Dec 29, 2023

TruckerLeaks said: ↑

Its your oil pan gasket. It needs to be changed.
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.

Omaralan · Jul 4, 2024

CHenk said: ↑

Thanks all for the responses and ideas! I'll keep you posted if I find what it is.
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I have the same problem as you described let me know found the problem thanks

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