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Joined: Jun 2011
Posts: 4,291 Likes: 4
Master Technician
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Here for a good time,not a long time.
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Joined: Jan 2016
Posts: 8,112 Likes: 231
SENIOR TECHNICIAN
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Blumby, easy fix that one, cut the broken bolt off flush with the base, center punch the center of the bolt, put a 1/8 inch drill through the center of the bolt, then run a 3/16th drill through it, then tap it 1/4 whit and job done
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Joined: Jun 2011
Posts: 4,291 Likes: 4
Master Technician
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Thanks NormK that would work expect I don't have a tap and die set,other wise I would give that a go.As I don't think these crankcases without the holes drilled are easy to come by.
Here for a good time,not a long time.
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Joined: Jan 2016
Posts: 8,112 Likes: 231
SENIOR TECHNICIAN
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!/4 inch tap whit tap is cheap and I can't imagine how you do this sort of work without a couple of ww taps
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Joined: Jan 2016
Posts: 387
Apprentice level 4
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Norm, aren't the WW and UNC the same at those smaller sizes? Or are they 55 and 60 degree cut on the thread? I'm quite sure the pitch is the same until they get bigger and then they differ? I'm just thinking if they are the same then an NC is easier to come across than a WW (around here anyway).
This Is going straight to the pool room.
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Joined: Jan 2016
Posts: 8,112 Likes: 231
SENIOR TECHNICIAN
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Yes Slash, both will screw into each other but as you say the pitch is slightly different. Easy to get a tap here. http://www.ebay.com.au/itm/HSS-Hand-Tap-Whitworth-BSW-1-4-TPI-20-taper-RH-Sutton-TEC-ESC-/322094231256?hash=item4afe4feed8:g:lG8AAOSw~oFXJzU4
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Joined: Jun 2011
Posts: 4,291 Likes: 4
Master Technician
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!/4 inch tap whit tap is cheap and I can't imagine how you do this sort of work without a couple of ww taps Actually it's quite easy I haven't had a lot of problems with threads before.This has only been the second time I've had a problem.Generally with bolts breaking etc I've usually been able to get them out.However this time it hasn't worked.So I've never needed a tap and die set.I mean if I not going to use them,then why buy them?
Here for a good time,not a long time.
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Joined: Jan 2016
Posts: 8,112 Likes: 231
SENIOR TECHNICIAN
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Fair enough then, now how much are you prepared to pay for postage, I'm sure I have quite a few of those engine cases here, there is a pile of early 2 stroke Victas sitting in my shed, I rarely look at, or send me your case and I will repair the thread, or you just buy a tap for $7. Lots of options there.
Last edited by NormK; 13/11/16 07:58 PM.
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Joined: Jun 2011
Posts: 4,291 Likes: 4
Master Technician
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Thanks NormK I've just got a couple of things that I'm going to try first.If it doesn't work then I'll let you know if I need another one.They were on a few other models from the same time period.
Here for a good time,not a long time.
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