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Peterbilt 379 Fan clutch Squeak when engaging.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Don379, Apr 29, 2021.

Page 3 of 5
  1. Apr 30, 2021 #21
    Don379

    Don379 Heavy Load Member

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    gates and by looking at it, it doesnt look like the teeth go all the way down in the grooves upon looking at them. I could run over to pete on monday and get one to try that i suppose
     
    Don379, Apr 30, 2021
    Don379, Apr 30, 2021
    #21
    Rideandrepair and God prefers Diesels Thank this.
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  3. Apr 30, 2021 #22
    AModelCat

    AModelCat Road Train Member

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    A lot of fan pullies will slip one way and grip the other way. Pretty normal. I do agree that belt should probably wrap a little more around the fan pulley but if every engine is setup like that I see no sense in re-inventing the wheel.

    Kinda hard to tell from your picture but the grooves in your fan pulley look pretty worn. Can you post a better picture?
     
    AModelCat, Apr 30, 2021
    AModelCat, Apr 30, 2021
    #22
    Dino soar, Rideandrepair, God prefers Diesels and 1 other person Thank this.
  4. Apr 30, 2021 #23
    Don379

    Don379 Heavy Load Member

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    yeah i can this weekend. they look new now. i had to chisel all that old belt material and debris out of it and then wire bruss like god diesel mentioned
     
    Don379, Apr 30, 2021
    Don379, Apr 30, 2021
    #23
    Rideandrepair and God prefers Diesels Thank this.
  5. Apr 30, 2021 #24
    AModelCat

    AModelCat Road Train Member

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    The sides of each groove in the pulley should be straight. Kinda looks like they are a little dished in and a bit of a step. Could be the angle of the picture too.
     
    AModelCat, Apr 30, 2021
    AModelCat, Apr 30, 2021
    #24
    Dino soar, Rideandrepair and God prefers Diesels Thank this.
  7. Apr 30, 2021 #25
    Don379

    Don379 Heavy Load Member

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    you are correct. the sides are exposed. i dont know why. weird. they are reaised in the other pulleys. just the fan hub. fan hub grroves are cleaned now to perfection
     
    Don379, Apr 30, 2021
    Don379, Apr 30, 2021
    #25
    Rideandrepair Thanks this.
  8. Apr 30, 2021 #26
    spsauerland

    spsauerland Road Train Member

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    Gates HD squeaked like that badly on our Caterpillar engines, switched brands of belts. Also sometimes when belts get cross referenced, they end up longer than spec. I'd get a Paccar belt and Dayco tensioner if it was mine.
     
    spsauerland, Apr 30, 2021
    spsauerland, Apr 30, 2021
    #26
    Dino soar, Don379, Rideandrepair and 1 other person Thank this.
  9. May 1, 2021 #27
    Rideandrepair

    Rideandrepair Road Train Member

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    I agree with @God prefers Diesels. If you haven’t tried yet. Take the single V A/C belt off. See if it goes away. Hopefully it does and is just a worn belt, not the pulley groove, yet.
     
    Last edited: May 1, 2021
    Rideandrepair, May 1, 2021
    Rideandrepair, May 1, 2021
    #27
    God prefers Diesels and Don379 Thank this.
  10. May 1, 2021 #28
    Don379

    Don379 Heavy Load Member

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    Will do sir. I did put a cat tensioner on, so I’ll start with the belt

    Thank you pal
     
    Don379, May 1, 2021
    Don379, May 1, 2021
    #28
    Rideandrepair and God prefers Diesels Thank this.
  11. May 1, 2021 #29
    marmonman

    marmonman Road Train Member

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    The answer to your problem is as simple as the fan clutch itself. Every time you engage it the clutch face slips causing the chirp you hear . Replace the clutch facing and it goes away . At least that has been my experience.
     
    marmonman, May 1, 2021
    marmonman, May 1, 2021
    #29
    Rideandrepair Thanks this.
  12. May 6, 2021 #30
    marmonman

    marmonman Road Train Member

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    Well have we found a cure yet ? Inquiring minds need to know
     
    marmonman, May 6, 2021
    marmonman, May 6, 2021
    #30
    God prefers Diesels and Rideandrepair Thank this.
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