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Figure I’d Ask.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by J.S., Aug 23, 2025 at 9:38 AM.

  1. Aug 23, 2025 at 9:38 AM #1
    J.S.

    J.S. Medium Load Member

    460
    207
    Jun 27, 2015
    Texas
    0
    Diagnosing a bad fan clutch and just about on my way to get the part but honestly I’m not 100% sure. I’ve got two of the symptoms being the fan doesn’t spin freely enough and my initial symptom which is rather loud and semi prolonged air loss when the ignition is turned off. About 10 seconds. A mechanic brought it to my attention saying that the air release I assume is normal is still excessive. Truck has 700k on a dd15. I’ve got no play and the fan spins strong. so im thinking its just not bad yet but yes its a failing clutch. I have the rear on/off clutch
    1090-09650-01B. Saw a borg and warner for $515 and freightliner has the original Kyser at $415 I believe. I’m thinking the FTL or the BW is about the same. So any advice on the diagnosis, Thx for reading!

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    J.S., Aug 23, 2025 at 9:38 AM
    J.S., Aug 23, 2025 at 9:38 AM
    #1
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  3. Aug 23, 2025 at 11:56 AM #2
    El Hueso

    El Hueso Medium Load Member

    420
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    Dec 29, 2024
    El Paso. Tejas
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    At operating temperature when you shut it down, how long does the fan spin. And with it good and hot how does it feel turning it by hand? It's an air operated fan switch right? With the key on and engine off you can see if the fan turns. If it doesn't unplug the solenoid and see if it is free.
     
    Last edited: Aug 23, 2025 at 12:01 PM
    El Hueso, Aug 23, 2025 at 11:56 AM
    El Hueso, Aug 23, 2025 at 11:56 AM
    #2
  4. Aug 23, 2025 at 12:07 PM #3
    Ridgeline

    Ridgeline Road Train Member

    22,436
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    Dec 18, 2011
    Michigan
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    Two things, first is that BW owns Kyser, they are the same.

    Second, BW makes a rebuild kit for their air clutch products. I think it is like $90. once you have it off, it is not a hard rebuild. But I would first find out if you need to rebuild it or if you have an air leak to the clutch.
     
    Ridgeline, Aug 23, 2025 at 12:07 PM
    Ridgeline, Aug 23, 2025 at 12:07 PM
    #3
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