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TJD
TJD
Devonport Tasmania
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Undoing crank bolts and studs
#709250 09/22/17 3:11 am
Joined: Aug 2001
Posts: 3,036
Likes: 8
Rohan Offline OP
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Is there any trick to undoing the studs and bolts in an (iron) dommie crank.

These are undisturbed after 60+ years, and seem to have been rather vigorously
centre-punched on the edge of the threads, and they are not going to give up easily.

Can the centre-punch marks be ground or filed or drilled out somehow, or is it just a matter
of using enough muscle to overcome them. Or can they just be wound up until they snap.
(are they hi-tensile ?) Assuming you already have a replacement set on hand.

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Re: Undoing crank bolts and studs
Rohan #709397 09/23/17 9:13 am
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personally i would try to file or grind off the excess material as much as possible it will certainly make life easier.. i would also try and locate a new set to re-assemble it if they are available

Re: Undoing crank bolts and studs
Rohan #709515 09/24/17 12:12 pm
Joined: Nov 2003
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norton twin crank bolts ar considered a consumable item. i NEVER reuse them.


windy
72 combat
switchbackcreek.com
Re: Undoing crank bolts and studs
Rohan #709544 09/24/17 6:13 pm
Joined: Oct 2007
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I stripped and rebuilt my 99 over 20 years ago and reused all the fixings ,it has been used a fair bit since then including 3 10 day IOM holidays and three track days. I did not grind or file down the punchings. The Norton service manager who for years went around stripping customers bikes (hundreds) reused the fixings as long as the threads were not obviously stretched,including big end bolts. This was at a time when money was scarce. 88 cranks and rods were pretty bullet proof in normal use. 99 and 650 not as much.


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