94 SLS idler pulley bolt ripped from block
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 94 SLS idler pulley bolt ripped from block in Past Cadillac Vehicle Discussion; Idler pulley bearing froze up, and when it did it ripped from block and tore bolt housin so its not ...
  1. #1
    Beau2715 is offline Cadillac Owners Member
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    Question 94 SLS idler pulley bolt ripped from block

    Idler pulley bearing froze up, and when it did it ripped from block and tore bolt housin so its not a flat suface, about 1/2 is still on block. Can i just possibly bypass idler or is it essential? Thought about rethreading old hole but having trouble find new bolt. Any ideas would be great, I really dont want have take shop and get screwed

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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    No, you can't bypass the pulley. Better hope there's enough left to Helicoil and bolt a pulley back on to, otherwise, it's new block time.

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    Beau2715 is offline Cadillac Owners Member
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    Re: 94 sls idler pulley bolt ripped from block

    Ok, thank you. Is this engine a aluminum block or cast iron, can old hole possibly be filled with weld and redrilled?

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    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Aluminum. It would be pretty much impossible to attempt a repair in the car. It wouldn't be easy even out of the car.

  6. #5
    Beau2715 is offline Cadillac Owners Member
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    Re: 94 sls idler pulley bolt ripped from block

    Thats what i was afraid of, thank you for info.

  7. #6
    kaceyseldo's Avatar
    kaceyseldo is offline Cadillac Owners Fanatic
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    Quote Originally Posted by MoistCabbage View Post
    Aluminum. It would be pretty much impossible to attempt a repair in the car. It wouldn't be easy even out of the car.
    What you have to understand is aluminums reaction to heat. Its tendency to warp in times of crisis. I would say its not impossible, but you better be damn good at machining.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, install a sound system
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    Re: 94 SLS idler pulley bolt ripped from block

    With a bit of effort and removal of the tire/wheel and inner fender liner skirt, a good Mom&Pop shop can remove the bolt stub, drill and Helicoil the hole for the same sized bolt as original. It's labor intensive but do-able. A Cadillac dealer will charge you the national debt to do it.

    FWIW, there is a chapter in the GM service manual that is dedicated solely to Northstar bolt thread repairs.

  9. #8
    naif is offline Cadillac Owners Connoisseur
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    Re: 94 SLS idler pulley bolt ripped from block

    Just to throw a number in here, the bolt holding the idler pulley on my DHS engine sheared off (? no idea why...), I drove it to a Cadillac dealer on battery power only and gave them a blank check to fix it - they had to lower the engine to weld a nut on to the stub to get it out. Total cost was about $400... which I thought was reasonable (I had dropped off the car on a Sunday and it was done Monday afternoon.)

  10. #9
    kaceyseldo's Avatar
    kaceyseldo is offline Cadillac Owners Fanatic
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    Quote Originally Posted by naif View Post
    Just to throw a number in here, the bolt holding the idler pulley on my DHS engine sheared off (? no idea why...), I drove it to a Cadillac dealer on battery power only and gave them a blank check to fix it - they had to lower the engine to weld a nut on to the stub to get it out. Total cost was about $400... which I thought was reasonable (I had dropped off the car on a Sunday and it was done Monday afternoon.)
    Surprising.... must be a quality dealership...

  11. #10
    Beau2715 is offline Cadillac Owners Member
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    Re: 94 SLS idler pulley bolt ripped from block

    Hmm, maybe I will call the local dealership and see, thanks for input.

  12. #11
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 94 SLS idler pulley bolt ripped from block

    Here's a thought that MIGHT work. Fill the hole with JB Weld. Trowel is smooth and place some tape over it so it doesn't run out til it sets up. Then drill and Helicoil it.

  13. #12
    Beau2715 is offline Cadillac Owners Member
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    Re: 94 SLS idler pulley bolt ripped from block

    I was considering doing this but i wasnt sure how that stuff really works, i have never used it before

  14. #13
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 94 SLS idler pulley bolt ripped from block

    It is great stuff and works well. It does take some time to set up though, so like I said, if it is used to fill a hole in a vertical position, I'd tape it after filling as it will run very, very slowly.

  15. #14
    el_dorado_mex's Avatar
    el_dorado_mex is offline Cadillac Owners Fanatic
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    And don't forget to spray a good portion of brake cleaner in there to get rid of grease and dirt, the surface has to be really clean or the weld won't "glue". I also have had good experience with it on several occasions, including even coolant leaks because of rotten aluminum.

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