Triumph Wedge Owners Association
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TSB Numbers Decoded

During the production run for the TR7 and TR8 (as well as the periods before and after that time), British Leyland (later Jaguar Rover Triumph) assigned each Technical Service Bulletin (TSB) an identifier.  The format of these identifiers provided some basic information about the TSB (e.g. the year of issue).  Two formats were used.
 
Pre-1980 TSBs
Through 1979, TSB were assigned "Numbers", which were actually alphanumeric identifiers.  The format was YY-C-Na, where
  • YY - The year issued.
  • C - Indicates the component or area as follows:  A - Engine, B - Electrical, C - Body, D - Transmission, E - Paint, F - Chassis, G - Miscellaneous, H - Air Conditioning, and Z - Recalls.
  • N - A sequential number within each component/area.  The first TSB of the year for each component/area starts with 1.  Also note that each marque within BL had its own sequence, meaning there were duplicate TSB "Numbers".  To illustrate this point, there are three 77-B-1 TSBs - one for Austin/MG (1977 Wiring Diagram), one for Jaguar (Revised Electrical Relays), and one for Triumph (Head Lamp Feed Wire Security).
  • a - Optional.  Indicates an addendum to a previous TSB.  For example, 75-D-6A and 75-D-6B are addendums to 75-D-6.

In 1979, BL began color-coding by marque to help with segregating TSBs.  Triumph TSBs were printed on blue paper, Jaguar on green, and Austin/MG on light red.  TSBs applying to all marques were on white stock.  However, the issue of duplicate "Numbers' remained (e.g. there are four 79-A-1 TSBs, with one each for Austin/MG, Jaguar, Triumph, and All Marques).  TSB 79-G-1 (note it's on white stock) provides additional info on this change.

One last note for pre-1980 TSBs.  There is nothing in the "Number" to indicate which model within a marque is being addressed by the TSB.  Under Triumph chassis TSBs, the first bulletin of 1975 (75-F-1) was issued against the TR6, with the second (75-F-2) for the TR7, while the third (75-F-3) applied to all Triumph models.
 
1980 and later TSBs
The color coding which began in 1979 carried over into 1980 with the following changes. 
  • Austin/MG was now just MG and used pink paper. 
  • White stock was used for administration.  This was in place of the all marques nomenclature in '79..
  • Rovers TSBs were added on tan paper.

Starting in 1980 the "Number" used in the previous years was now known as "Item".  "Item" could be in one of two formats as follows.

MYY/NNN was used for marque-specific TSBs, where
  • M - Indicates the marque with J for Jaguar, M for MG, T for Triumph and R for Rover.  While these may seem redundant when combined with the color coding being used, it would help in those instances where a 'Xerox' copy would be made on white paper.
  • YY - The year issued.
  • NNN - A sequential number within each marque.  The first TSB of each year begins at 1.

YYA/NN was used for administration TSBs, where
  • YY - The year issued.
  • A - Indicates an administration TSB
  • NN - A sequential number that begin with 1 for each year.

The component indicator was no longer being used, with TSBs being organized strictly by marque (or administration).. 

Another change, though not officially noted, dealt with the number of TSBs per page.  Before 1980, no more than one TSB was listed on a page.  With the latest changes, a single page could contain two, three, or even four TSBs..

Reference TSB 80A/01 for additional details.


​Triumph Wedge Owners Association (TWOA)
TWOA is an Affiliate Chapter of the Vintage Triumph Register
  • Home
  • About/Join
    • Club Benefits
    • Sample Newsletter
    • Fuel Injection >
      • The TR7 ECU - Bosch
      • The TR8 ECU - Lucas
      • Heated O2 Sensors
      • Inside an FI Tank
      • Noid Test Light
    • Join or Renew Online
    • zzzz Join or Renew Online
    • Join or Renew by Mail
    • Board of Directors
    • Bill Sweeting Remembered >
      • Articles >
        • FASD Technical Specifications
        • Members Only Articles
        • TR7 4-Speed Overdrive Conversion
        • TR8 Cooling Fan Circuit
    • Contact Us
  • Tech/Parts
    • Dealer Documents >
      • Memos
      • Recall Campaigns
      • Technical Service Bulletins >
        • A - Engine
        • B - Electrical
        • C - Body
        • D - Transmission
        • E - Paint
        • Z - Recalls
        • F - Chassis
        • G - Miscellaneous
        • H - Air Conditioning
        • TSB Numbers Decoded
      • Training
      • Service Tools
    • Model Information >
      • Brochures
      • Deciphering The Wedge >
        • Component Serial Numbers
        • Paint and Trim Codes
        • VIN and Component Serial Number Locations
        • VIN Numbers Decoded
      • Labels and Decals
      • TR7 Special Editions >
        • Limited Edition
        • Spider
        • Southern Skies
        • 30th Anniversary Edition
      • TR8 >
        • BL Motorsports: Hurdwell Memo
        • California Air Resources Board Emissions Certifications
      • Wedge Colours
    • Parts Suppliers
    • Cottage Industry Parts
    • TWOA Parts
    • TWOA Tool Rentals >
      • TR7 Head Honcho
      • TR7 Head Honcho in Action
      • Fuel Injection Tools >
        • Gizmo
        • Looking Glass
  • Resources and Services
    • Reproduction Suggestions
    • Cars For Sale
    • Cars Wanted
    • Parts For Sale
    • Parts Wanted
    • Harris Mann Art Prints
    • Mailing List, Forums & Clubs
    • Gems: TR8CCA+WWWedge
    • Tech: Best of the Web
    • Wedge List Files
  • Events
    • Calendar of Upcoming Events
    • 2020 TWOA Virtual Car Show Results
    • Past Event Photos >
      • Britain on the Green 2015
      • The Kastner Cup 2015
      • Triumphest 2014
      • VTR National Convention 2014
      • The Gathering Dobson NC 2013
      • Dobson The Gathering 2012
      • South Central VTR Regional 2012
      • Triumphest 2012
      • Maryland British Car Day 2011
      • Dobson Gathering 2010
      • Roadster Factory 2010
      • British Invasion 2009
      • Roadster Factory 2009
    • VTR National Awards History
  • Members
    • Newsletters
    • TWOA Parts Store
    • Sun Visor Information
    • Regalia
    • Official TWOA Documents
    • TWOA Poster
    • FI hose replacement
    • FASD Photos
    • Rear End Spring Experiment
    • Bushing Tests
    • Bushing Buddy - Installation Tool
    • Odd's Engine Removal Tools