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Stude Starter Bolt info for newbies!

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  • Stude Starter Bolt info for newbies!

    Being a StudieNewbie around here, I'm constantly finding out unique things about Studebakers that my years of GM experience never prepared me for, so I thought I'd share this one for the benefit of noobs even noobier than me

    Thanks to the guys on this forum, I found out that the starter bolts on Studes are a special part rather than an off-the-shelf fastener.

    The factory bolt, p/n 529367, is a special one with an unusually long collar section. The reason for this is that the long collar goes completely through the starter flange and the transmission bellhousing, keeping the two in alignment and protecting the Bendix drive gear from improperly engaging the ring gear (which could chew up both gearsets); a standard bolt's threads have a smaller diameter than the collar and allow the starter to become misaligned.

    Unfortunately, dumb auto shops through the years paid no attention to this and just used whatever bolt was lying around handy.

    The photo shows the difference between the special Stude bolt and a standard fastener. (The upper bolt is the Stude part.) First you spot the difference in length; the Studebaker part is a good 1/4" longer. Notice the difference in the collar length? The Stude bolt's collar is a good inch long, where the standard bolt quits at about 1/2". Finally, the Studebaker part uses fine-pitch threads, where the aftermarket bit was coarse thread.

    These special bolts are long out of the parts bins, of course; but try your friendly Studebaker vendors. They'll likely be able to track you down a set. I got mine from Rich Gahlbeck at Studebakers Northwest (StudeRich on this forum).


    Clark in San Diego
    '63 F2/Lark Standard

    Clark in San Diego | '63 Standard (F2) "Barney" |

  • #2
    Probably an optical illusion, but they dont look like the same thread.
    Have you tried the same nut on each? I would think that you could get
    a longer bolt, which would have a longer shoulder, & cut the threaded
    end off to the correct length.

    EDIT : OK .. I didnt see the extra text after the picture, so why can
    you not get the same fine thread from a place like Napa or Ace? The
    longer shoulder/collar will still apply with a longer bolt.


    '63 Avanti, zinc plated drilled & slotted 03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, soon: 97 Z28 T-56 6-spd, Ported heads w/SST full flow valves, 'R3' 276 cam, Edelbrock AFB Carb, GM HEI distributor, 8.8mm plug wires
    '63 Avanti R1, '03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, TKO 5-spd, Ported heads w/SST full flow valves.
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