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The BSA A7-A10 Forum
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A7 & A10 Engine
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Engine cover stainless allen screw sets
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Topic: Engine cover stainless allen screw sets (Read 1552 times)
Josh Cox
Valued Contributor
Join Date: Apr 2009
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Engine cover stainless allen screw sets
«
on:
17.08. 2009 10:23 »
Hello,
Have purchased a Stainless allen screw set for my engine covers, there are three screws that I have not idea where they belong.
Three 5/16 by 18TPI by 1-31/32 ?.
Sent the guy that sold them to me an email and his response was:
Quote
Dear joshua3608,
they usally go on clutch side on chain case the first 3 where the dome is thanks
I can not see were they live, anyone have a part number ?.
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Black 1953 Golden Flash Plunger
Brian
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Join Date: May 2007
Posts: 1806
Karma: 43
Mt Gambier, South Australia.
Re: Engine cover stainless allen screw sets
«
Reply #1 on:
17.08. 2009 10:48 »
Your bike is a plunger model isnt it Josh, they dont use the three screws in question, there only for the s/arm models. If you have a carefull look at a picture of a s/arm model, or a real one if someone you know has one, you will see the front three screws in the primary cover are larger than the rest.
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Josh Cox
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Re: Engine cover stainless allen screw sets
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Reply #2 on:
17.08. 2009 11:13 »
Thanks Brian.
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Black 1953 Golden Flash Plunger
snowbeard
American Citizen in Lisbon, Portugal
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Join Date: Aug 2007
Posts: 246
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Re: Engine cover stainless allen screw sets
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Reply #3 on:
19.08. 2009 05:54 »
I bought some concentric screws from a fellow who told me they didn't know a good source for the primary threads, etc. might I inquire where you got yours?
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\'57 BSA A-10 Spitfire Scrambler
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Josh Cox
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Join Date: Apr 2009
Posts: 275
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Re: Engine cover stainless allen screw sets
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Reply #4 on:
19.08. 2009 08:18 »
Ebay
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&rd=1&item=130323594124&viewitem=&sspagename=STRK%3AMEAFB%3AIT&salenotsupported
http://myworld.ebay.com.au/builderboy01/
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Black 1953 Golden Flash Plunger
BSA_54A10
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Join Date: May 2008
Posts: 2544
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Re: Engine cover stainless allen screw sets
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Reply #5 on:
19.08. 2009 11:18 »
www.stainlessbits.com
dose kits for just about every British bike and goes to the effort of makinf sure that the bolts are the correct thread and length
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Bike Beesa
Trevor
Josh Cox
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Join Date: Apr 2009
Posts: 275
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Re: Engine cover stainless allen screw sets
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Reply #6 on:
19.08. 2009 13:42 »
Snowbeard,
I'm pretty sure you'll be able to find the bolts you want often locally, how much do you know about threads ?.
The Primary case bolts are 1/4 BSW, which is 20TPI (60 degree pitch).
1/4 UNC is also 20TPI (55 degree pitch).
The pitch makes F/all difference in this case.
I went to a local bolt place and they wanted $1 per bolt, cheaper to buy the pack off ebay.
http://www.classicfasteners.com.au/TechData/THREADCH.PDF
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Black 1953 Golden Flash Plunger
RichardL
Outside Chicago, IL
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Join Date: Nov 2007
Posts: 6361
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Re: Engine cover stainless allen screw sets
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Reply #7 on:
19.08. 2009 15:29 »
Josh,
I can't really say I know a "wit's worth" of actual fact about possible damage from using UNC screws in Whitworth holes, but I am, at first, put off by the idea that it is OK as standard practice. It seems unnecessary since so many sources can provide the original-thread screws.
Richard L.
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alanp
Plymouth, Devon
Valued Contributor
Join Date: Jul 2009
Posts: 473
Karma: 7
Re: Engine cover stainless allen screw sets
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Reply #8 on:
19.08. 2009 16:11 »
Just a point of personal preference chaps, nothing looks better than using slotted stainless screws for chain/timing case fixing, preferably from Simon Barleycorn. They look classic and the strong stainless he uses resists damage to the slots from hooligan screw driver use. They are not to be confused with the screws made of age hardened cheese which BSA used to use. Hex socket screw heads just don't look right on old Brit bikes and you definitely don't need the torque that you can generate with hex socket heads which can easily strain/strip the threads in the aluminium if you're not careful. The makers of thread insert repair kits for stripped threads would love you to keep on using hex sockets.... nuf said.
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beezalex
North Carolina, USA
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Join Date: Jan 2008
Posts: 374
Karma: 4
Re: Engine cover stainless allen screw sets
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Reply #9 on:
19.08. 2009 16:27 »
I agree, alanp. Over here, I can get them from McMaster-Carr by the box. If you have a poperly fitting screwdriver, they hold quite well. And, yes, you can put a 1/4" UNC screw in a 1/4 BSW thread if you chase it.
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Alex
Too many BSA's
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The BSA A7-A10 Forum
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Technical (Descriptive Topic Titles - Stay on Topic)
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A7 & A10 Engine
»
Engine cover stainless allen screw sets