18mm Northstar Crankbolt needed
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Northstar Engines and System Technical Discussion Discussion, 18mm Northstar Crankbolt needed in Cadillac Engine Technical Discussion; In rebuilding my 97 STS N* engine I bought a crankshaft off ebay. The crankshaft did not come with a ...
  1. #1
    ToMuchWork is offline Cadillac Owners Member
    Automobile(s): 97 sts
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    Oct 2009
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    18mm Northstar Crankbolt needed

    In rebuilding my 97 STS N* engine I bought a crankshaft off ebay. The crankshaft did not come with a crankshaft bolt and my original bolt is too small for this crankshaft. Seems that there are crankshafts that have 14mm bolts and ones that have 18mm bolts. I have called all the GM dealerships in my area but all the bigger bolts that they have are about 3 inches longer then my original bolt. Anyone know where I can find a new 18mm crankshaft bolt? I would like to get a new one as I understand they have to have quit a bit of torgue on them and dont want to risk using one that has already been stressed. Any help very much appreciated.

    Thanks,

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  3. #2
    vincentm's Avatar
    vincentm is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 Cadillac Eldorado ETC
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    Re: 18mm Northstar Crankbolt needed

    Fastenal?

  4. #3
    ToMuchWork is offline Cadillac Owners Member
    Automobile(s): 97 sts
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    Re: 18mm Northstar Crankbolt needed

    Seems like the N* came with either a 14mm or a 18mm crankshaft bolt for a number of years. Anyone have a idea why? This N* engine just keeps on throwing out curveballs.

  5. #4
    tateos's Avatar
    tateos is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 ETC (GAVE TO STEPSON 2011), 2000 DTS (RIP)
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    Re: 18mm Northstar Crankbolt needed

    The original bolt, unless abused, may be re-used - there is not that much torque applied to it when installed - it's just hard to break free when trying to remove it after many years of being installed. That said, I buggered up the head on my bolt in the removal process - through carelessness, really - ordered a replacement from gmpartsdirect.com

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