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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

    unkamort
    Member

    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

    medicinal_marinara
    Member
    from Oregon

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

    325w
    ALLIANCE MEMBER

    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

    garyf
    Member

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

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

    Bobert
    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
    Member
    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

    unkamort
    Member

    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

    1971BB427
    Member
    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

    unkamort
    Member


    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

    cbillelder
    Member

    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
    ALLIANCE MEMBER
    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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