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Crank Bolt Replacement

Discussion in '"Stock" Alpine' started by fastfrontier17, Dec 25, 2021.

  1. fastfrontier17

    fastfrontier17 Donation Time

    Hi all,

    I'm replacing the timing cover in my 1600 and just removed the crank pulley. I used some extensions and a torque wrench on a castellated nut and out came a stud. Is it recommended to replace this combo with a bolt or reuse the original hardware?
     
  2. mikephillips

    mikephillips Donation Time

    I've never seen a stud with nut as original equipment in the nose of an Alpine crank in the near 50 years I've messed with them. Only a bolt with a handcrank engagement or a bolt with a thicker hex head. So you seem to have something someone replaced in the past.
     
    Tim R likes this.
  3. fastfrontier17

    fastfrontier17 Donation Time

    I was hoping that wasn't the case. I'll have to find a suitable bolt to replace it with
     
  4. sunalp

    sunalp Platinum Level Sponsor

    The studs were usually in the earlier cars, at least that's what I've seen. I did recently pick up
    a 1725 and it had the aluminum nut on it with the stud( it's a rather short one), but that's removed
    and a bolt and new balancer will take its place. The nuts are available from Sunbeam Specialties
    and Classic Sunbeam.
    Cheers!
    Steve
     
  5. fastfrontier17

    fastfrontier17 Donation Time

    Did it have a thick washer with it in lieu of a tab washer?
     
  6. sunalp

    sunalp Platinum Level Sponsor

    No, it had a tab washer on it. I have seen plenty with thick washers though. Be sure to use
    some loctite on the threads when reinstalling. Just a little extra insurance. The blue stuff should
    be sufficient.
     
  7. fastfrontier17

    fastfrontier17 Donation Time

    Thanks for the info! It's a thick washer with two smaller holes in it.
     
  8. puff4

    puff4 Diamond Level Sponsor

    Yep, but for goodness sake do NOT use the red stuff. You need to apply 500F to release the red stuff if you ever want it off again, so that's a non-starter when it comes to the crank.
     
  9. fastfrontier17

    fastfrontier17 Donation Time

    Anyone know why rootes stopped the stud/nut and went for a bolt?
     
  10. sunalp

    sunalp Platinum Level Sponsor

    They have a habit of loosening up while driving. That and the aluminum threads in
    the nut tend to strip.
     
  11. fastfrontier17

    fastfrontier17 Donation Time

    My nut looks like steel. Aluminium on steel would likely corrode wouldn't it? Seems like rootes would be smarter than that.
     
  12. sunalp

    sunalp Platinum Level Sponsor

    You'd think so, but that's just not the case!
     
  13. fastfrontier17

    fastfrontier17 Donation Time

    Happen to know what size grade 8 bolt would do the trick? I read 3/4-16x1". Sound a out right?
     
  14. fastfrontier17

    fastfrontier17 Donation Time

    Bought a replacement bolt and tab washer from sunbeam specialties. Is the stock stack-up just bolt and tab washer, or is there another washer in the mix. I have a flat washer that was on the stud/nut combo that I mentioned originally, so not sure if that's part of the stack too.
     

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