Truck belt area squeak...

Discussion in 'Mechanic and Repair' started by mkwl, Nov 15, 2007.

  1. mkwl

    mkwl LawnSite Bronze Member
    Posts: 1,701

    I've noticed lately that the belt area on my truck (6.0L) has a squeak between 1500 and 500 RPM's. It seems to be most evident on damp or rainy days, when the temp is colder. It isn't like a constant squealing, it's like a squeak that coencides with the speed of the engine. Anyone have any idea what it could be?

    Thanks,
    Matt
     
  2. topsites

    topsites LawnSite Fanatic
    Posts: 21,653

    Yeah, it's likely a pulley bearing or bushing gone dry.
    The easy fix but be dang careful, is to take a spray can with wd-40 and that silly little tube and CAREFULLY squirt a little wd-40 right into the pulley where it rides, not the belt but right about dead center where the bearing / bolt axle is, if you have more than one it might be best to try and isolate the guilty one.

    The reason I say be careful is do NOT get wd-40 on the belt(s)!
    I suppose you could unhook that but I never have, now if that doesn't fix it well it only takes a minute anyhow.
     
  3. mkwl

    mkwl LawnSite Bronze Member
    Posts: 1,701

    What's the best way to get into the pulley areas? Will WD-40 catch fire if I pverspray accidently?
     
  4. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,022

    Before you go spraying ANYTHING on a SEALED bearing remove the belt and by hand free spin any idler pulley(s) and the alternator, REPLACE which ever is making the noise. Sprays are nothing more than band-aids and will only last a short time.
     
  5. mkwl

    mkwl LawnSite Bronze Member
    Posts: 1,701

    What's the best way to remove/re-install the belt? Is there a diagram online somewhere with the belt routing for my 6.0L V8 in my GMC? It looks pretty complex to me!
     
  6. 44DCNF

    44DCNF LawnSite Bronze Member
    Posts: 1,462

    I think there ought to be a sticker on your hood or radiator support showing the routing. I don't know your particular vehicle but typically they are shown on a sticker. Take a digi pic if nothing else.
    You may be able to de-tension the pulley with a wrench on the bolt or if it has a square drive hole in the arm to the pulley put a ratchet w/extension in the hole and turn. Again don't know GM's but I think it is typical.
     
  7. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,022

    Your right on the diagram decal 44DCNF, One other thing I forgot to mention above is once the belt is off spin the fan blade as well to check the water pump bearings.
     
  8. mkwl

    mkwl LawnSite Bronze Member
    Posts: 1,701

    Found the sticker- which pulley do I take the tension off the belt from/how?
     
  9. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,022

    It has been a while since I seen one of these trucks but there should be a aluminum arm with a flat idler pulley mounted on the end of it. There should be a square hole in this arm to insert a square drive ratchet/breaker bar. Insert one of the two and pull/push on it to loosen the tension (it's spring loaded) enough to slide the belt off the side of the pulley.
     
  10. mkwl

    mkwl LawnSite Bronze Member
    Posts: 1,701

    Okay, can a new (or old if it's okay) belt be installed from the top of the engine without taking anything more apart than taking off the air intake tube for easier access?
     

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