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Belt idler pulley

Discussion in 'The Hokey Ass Message Board' started by unkamort, May 13, 2011.

  1. unkamort
    Joined: Sep 8, 2006
    Posts: 1,014


    I'm trying to create something that did not exist in nature. What I need is a fan belt idler pulley (1/2" wide at the top of the V) and bearing assembly. The adjustment slot in the bracket I came up with is 3/8" wide, so the support bolt/shaft size is limited. 3" pulley diameter would work. I just got back from the local Bearing Agency... the only thing he could come up with was a standard pulley which I would have to machine to accept bearings. This is beyond my meager capability here at home. Looking for suggestions and/or advice.
  2. medicinal_marinara
    Joined: Nov 24, 2009
    Posts: 139

    from Oregon

  3. 325w
    Joined: Feb 18, 2008
    Posts: 5,608


    Older AC cars had an idler. Some were V belt some were back side idlers. They use a standard alternator bearing. I have one on that car you see to stop belt whip on the ac belt.
    Last edited: May 13, 2011
  4. garyf
    Joined: Aug 11, 2006
    Posts: 241


    chrysler products used them-318 a/c- dodge magnum,mirada,cordoba- era

  5. Bobert
    Joined: Feb 21, 2005
    Posts: 820

    Member Emeritus

    You might want to look at early Olds like 303". They have an idler for the belt from the crank to water pump pulley.
  6. J Twitero
    Joined: Apr 15, 2011
    Posts: 105

    J Twitero
    from Minnesota

    I had a '66 IH pickup with a 266 that had a spring loaded idler on the v-belt.
  7. 1/2" wide? are you using an A belt?
  8. unkamort
    Joined: Sep 8, 2006
    Posts: 1,014


    If I ever really knew what the code was for fan belts was its long gone now. I thought I might run the water pump direct drive from the crank... but after 5 trips to the parts store for a belt that would work it became ovious some adjust-ability needed to be built in. That being said the belt that fits the pump pulley is a "9" series width, which is the 1st digit of the part#, followed by a 3 digit length code. That was gates and goodyear. I didn't understand the top dimension they were looking for on the McmasterCarr page (Thanks medicinal !). I have a standard application, but the PS has been deleted, and that was the adjustment point on that belt.
  9. 1971BB427
    Joined: Mar 6, 2010
    Posts: 6,899

    from Oregon

    Just go to the wrecking yard and find an old Toyota with the 22R 4 cyl. engine. They've got a idler pulley that's already got an adjuster on it. The whole thing might be $10.
  10. unkamort
    Joined: Sep 8, 2006
    Posts: 1,014


    Yep... sounds like bone yard time. Thanks for all the suggestions. I'll just have to prowl around and see what I find.
  11. cbillelder
    Joined: Dec 17, 2010
    Posts: 720


    For a backside idler pulley, I've used the one for the timing belt for the 2.3 Ford 4 cylinder motors. The pulley is flat on the diameter, but is about 1" wide, so there shouldn't be a problem with the belt slipping off the edge if positioned correctly.
  12. Hamtown Al
    Joined: Jan 17, 2007
    Posts: 2,456

    Hamtown Al
    1. Virginia HAMB(ers)

    I've got an idler pulley on my 291 Desoto and it works fine but I'm trying to come up with something to use as a replacement should the time come.. suddenly!
    So far, I ordered from Advance an idler pulley for a 1989 Ford pkp with A/C. The pulley looks to be the same diameter as the stock pulley on the Desoto. They also sell the pulley with the idler mount, too but I was too cheap to buy that! I'm hoping to come up with a bolt that will bolt the new pulley in place of the old one. I hope this helps you at least get a starting point. Good luck. Al

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