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Old 01-02-2019, 07:43 AM   #1
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Retarder Whistle

Have a 2009 Insignia on a Freightliner, with a 360 Cummins. A 3000 Allison with a retarder. Not a Jake or exhaust brake. There is no "joy stick" as mentioned on other posts. Just a rocker switch. So it's either on or off.

Took it out the other day and when I came to an intersection and when I turned it on I got a whine/whistle. Came from toward the rear of the coach. Any ideas? It worked and slowed me down but I didn't like that noise. Never heard it before.
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Old 01-02-2019, 10:32 PM   #2
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Well, you do not have a "retarder", you have an exhaust brake or a variable turbo. The whistle is normal
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Old 01-02-2019, 10:43 PM   #3
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Agree with Don, as far as I know CC never used the transmission retarder. Only one I know of would be Foretravel, Newell, Prevost etc.
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Old 01-04-2019, 06:07 AM   #4
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really

Who starts a reply with "well"?

I've driven for years. I know the difference between a exhaust brake and a retarder. I've had this coach for many years as well and this is the first time I've ever heard this noise when I flipped on the RETARDER! Yes this coach has a retarder. So you both learned something. I have to. Go to Allison not a forum!
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Old 01-04-2019, 06:30 AM   #5
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A whistle is normal for us who have a a Engine or Exhaust brake. I’ve been in Allison seminars where the retarder was discussed, but they emphasized it’s not a normal production coach item, so I’m not familiar with any noises related to it.
If it’s gotten loud, you could have a turbo problem!
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Old 01-04-2019, 01:23 PM   #6
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Quote:
Originally Posted by dwarne View Post
Who starts a reply with "well"?



Well, I do
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Old 01-08-2019, 11:29 AM   #7
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The output retarder has an air solenoid and an accumulator that are used to fill the retarder cavity when it's engaged. It may be there is an air leak at one of the retarder air solenoid connections, or the solenoid itself.
Some have the solenoid mounted directly to the accumulator. That joint could be leaking.
Some have the solenoid connected to the accumulator with an air hose between the two.
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