BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
JWood Auctions JRC Engineering dealers JWood Auctions
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Member Spotlight
Blapper
Blapper
Kent UK
Posts: 4,542
Joined: August 2007
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
22 registered members (Alan_nc), 219 guests, and 434 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Dan1818, Konaflyer, Begbie, Andrew Fallo, Zack Banks
10419 Registered Users
Top Posters(30 Days)
btour 85
Rohan 77
Triless 70
reverb 68
Popular Topics(Views)
713,648 mail-order LSR
Forum Statistics
Forums34
Topics68,327
Posts665,185
Members10,419
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate Thread
drain plug gearbox 750 commando #65106
05/01/06 4:34 pm
05/01/06 4:34 pm
Joined: May 2006
Posts: 5
belgium
manxman88 Offline OP
BritBike Forum
manxman88  Offline OP
BritBike Forum

Joined: May 2006
Posts: 5
belgium
can anybody help me with the size of the drainplug of a norton commando 750.
The thread in the case is gone, so helicoil will be called in for help, but what size???

Support Your #1 BritBike Forum!

Check out British motorcycles for sale:
British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Check out British motorcycles for sale:
British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Re: drain plug gearbox 750 commando #65107
05/01/06 4:58 pm
05/01/06 4:58 pm
Joined: Aug 2001
Posts: 1,285
Hamilton, Mass. USA
D
Dave Comeau Offline

Crew Chief
Dave Comeau  Offline

Crew Chief
D

Joined: Aug 2001
Posts: 1,285
Hamilton, Mass. USA
From the norvil website
040138SS BOLT - GEARBOX DRAIN - 3/8" BSF - 0.525"A/F HEXAGON C D L S 3.90


dynodave
BSA 3 1961-1963
Ducati 3 1992-2002
Norton many 1951-1975
87 Serv-Equip 100HP MC brake dynamometer,
Re: drain plug gearbox 750 commando #65108
05/02/06 7:18 pm
05/02/06 7:18 pm
Joined: May 2006
Posts: 5
belgium
manxman88 Offline OP
BritBike Forum
manxman88  Offline OP
BritBike Forum

Joined: May 2006
Posts: 5
belgium
Thanks for the information! The partnumber 040138 is correct,but when I measure the bolt, the outside thread diameter is 12.55mm. This should be 1/2" (=12.70mm) or 31/64" (=12.30mm). TPI is 20. In the old-britt they refer to 040138 NORTON, Bolt, 3/8 x 20, 1/2", Gearbox Drain Bolt.
So is the bolt I have still the original one?
The bolt has a magnet in the core on top.

Re: drain plug gearbox 750 commando #65109
05/02/06 8:31 pm
05/02/06 8:31 pm
Joined: Mar 2006
Posts: 3,801
Norfolk, UK
L.A.B. Online content
BritBike Forum member
L.A.B.  Online Content
BritBike Forum member

Joined: Mar 2006
Posts: 3,801
Norfolk, UK
1/2" x 20 is UNF, so it looks as if the gearbox drain has already been drilled and tapped oversize.
The original drain plug thread stayed at 3/8" x 20(BSF) right up to the end of production I believe, as my 1975 850 plug is the same, also there is no magnet on it.


-------------------------------------


The original drain bolts (that I have seen) are distinctive as the flats of the hexagon are slightly thinner than a normal bolt head as the face of the hexagon is machined to a shallow dome shape.

Re: drain plug gearbox 750 commando #65110
05/03/06 4:42 am
05/03/06 4:42 am
Joined: May 2006
Posts: 5
belgium
manxman88 Offline OP
BritBike Forum
manxman88  Offline OP
BritBike Forum

Joined: May 2006
Posts: 5
belgium
Thanks for the replies, it will be helicoil and I will use an original bolt.


Moderated by  Dave Comeau 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.6.2