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Cracked drive pulley

Discussion in 'Dodge Ram SRT-10' started by Barrington, Jan 11, 2021.

  1. Barrington

    Barrington Junior Member

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    Cracked belt drive and power steer pump pulley. Yep, I removed the belt and found both pulleys cracked, srt10
    Any comments why?

    486C5755-085A-4A29-A349-2E136228D550.jpeg
     
    Last edited: Jan 11, 2021
  2. Nick_rp

    Nick_rp I=V/R Military

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    Age and heat. Not saying its common but for metal to warp (dosnt look cracked) like that its almost always age and constant heating and cooling
     
    Last edited: Jan 11, 2021
  3. Barrington

    Barrington Junior Member

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    I have just removed the power steer pump, pulley also cracked,
    Truck has only done 33,000 klms
    first post of main drive pulley,
    Photos below is power steer pulley.
    These are fully welded both sides!
    6F2AAD57-BBEA-4029-84A3-9AF5AC88D0F5.jpeg 53ADD252-D77C-4DFB-B5EB-74DC966AABDF.jpeg
     
    Last edited: Jan 12, 2021
  4. Nick_rp

    Nick_rp I=V/R Military

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    Pulleys are made from a single flat piece and rolled and brazed together. Low quality pulleys will obviously not last that long or maybe the manufacturer had a new guy on the line that didnt know what he was doing. Either way, the only thing to do is just replace it.
     
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  5. HemiLonestar

    HemiLonestar Senior Member Military

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    Those aren't cracks lol...like Nick said, the rib surface is rolled around the pulley piece. That's the seam. Since it technically isn't one solid piece of metal, the needs to have that seam to account for thermal expansion/contraction. Over time the gap may spread a bit but it's fine. Stock replacements will have the seam (albeit might be narrower being new) as well. Here is a crank pulley like yours and a PS pulley you can see the seam at the top.

    s-l1600.jpg
    s-l500.jpg
     
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  6. Barrington

    Barrington Junior Member

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    Thanks, I have ordered one of each pulley, the power steer one seams to be worse of the two.
    I’ll see how the new pulleys are.
     

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