Peterbilt 379 Fan clutch Squeak when engaging.

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

  1. 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
     
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  3. 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?
     
  4. 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
     
  5. 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.
     
  6. 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
     
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  7. 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.
     
  8. 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
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  9. 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
     
  10. 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.
     
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  11. marmonman

    marmonman Road Train Member

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    Well have we found a cure yet ? Inquiring minds need to know
     
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