Fan / Alternator Belt Idler Question

Discussion in '80-Series Tech' started by rbsheppard, Nov 5, 2005.

  1. rbsheppard

    rbsheppard

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    The fan / alternator belts are routing across an idler pulley on my 94 LC. This pulley really started to whine recently and after identifying it as the culprit by removing it, I started to question why it is there in the first place. The inside of the belts barely touch the pulley and it is hard for me to understand its importance. Will one of you more experienced cruisers enlighten me?
     
  2. Beowulf

    Beowulf

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    You'd probably have to ask a Toyota engine designer but the good news is that they are cheap from C-Dan. I replaced that idler puller, the A/C belt tensioner, the fan clutch, and all belts in one fell swoop.

    -B-
     
  3. IBCRUSN

    IBCRUSN

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    Mine whined as well an I removed it to confirm and noted the same as you did. In fact even with the belts tensioned up I was able to replace the idler. At any rate the only reason I could come up with have it installed was the somewhat long distance from the alternator to the crank (for support). Just a thought.

    kris
     
  4. RavenTai

    RavenTai

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    my cruiser did not have that pulley installed when I bought it, no ide how long it ran without it. I got a new one from Dan.
     
  5. IdahoDoug

    IdahoDoug

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    Unsupported belts can and will vibrate at certain RPMs/temps/ages/tightness, etc. When they do, they create considerable force spikes on the bearings of the other accessories and on the main crank. It is surprisingly easy to damage the crank front bearings as anyone who's had a crank vibration damper let go will attest. Prior to that damage, the oil seal on the front of the engine will sustain damage and begin dripping or worse.

    It's simply not a risk worth taking. Especially considering the very reasonable price and easy install of a new factory tensioner.

    DougM
     
  6. rbsheppard

    rbsheppard

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    Thanks for all the information. Can someone direct me to a link for C-dan so I can order a new one?
     
  7. Beowulf

    Beowulf

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    Send him a PM (Private Message), or wait for the banner ad in the upper right corner and get the phone number, or look him up on the vendor pages here on this site, or search for the 500 "I love Dan" threads that have been posted in the past 6 months, or call 1-800-432-6668 and ask for the Parts Department. Be sure to tell them you hate mud. (It's the secret phrase)

    -B-
     
  8. IdahoDoug

    IdahoDoug

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    Dan's on speed dial on my cell. As soon as you hear the nauseating taped voice (who is that moron??) telling you you've reached the parts department, hit 8 and you go to his extension.

    DougM
     
  9. Rusty Phillips

    Rusty Phillips

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    ok. my dumb question for the day

    my idler pulley is locked up tight - not turning at all,

    how in the hell do I get that bolt out?
    is there a set screw underneath the damn thing? Im beginning to think mine is welded in

    PS - it's a normal thread - right? so I muscle it counter clockwise and it comes out?

    maybe I can go get my sister to break the bolt loose for me.....
     
  10. landtank

    landtank SILVER Star

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    nothing special needed here other than being more than a 10lb weakling.
     
  11. CJF

    CJF

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    Ouch!

    Spray it with PB Blaster (preferred) or at least WD-40 before you go at it again.

    Curtis
     
  12. OZCAL

    OZCAL

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    Yeah careful I broke mine. I still haven't figured what my mechanic did to fix it but this thread reminds me I've got to order a new assembly.
     
  13. Beowulf

    Beowulf

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    I am certain you have a rusty phillips head that needs to be cracked loose.

    (Sorry guys.... still feeling a little goofy from the anesthesia.) :bounce:

    -B-
     
  14. Rusty Phillips

    Rusty Phillips

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    well, crap

    we didnt break the bolt, but instead rounded up the head of the bolt pretty good.
    wasnt able to get it out.
    decided to quit when it got dark.

    argh!
     
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