1974 Technical Service Bulletins

Below are the titles and TSB numbers for all the 1974 Technical Service Bulletins for MG and Austin vehicles published by British Leyland.

Category A – Engine #

All 1974 category A, Engine TSBs for Austin & MG.

TSB Number	Subject	Date	View/Download	Applies To
74-A-1	Connecting Rods	March 1974	74-A-1	1275 CC “A” Series Engines 1800 CC ” B” Series Engines
74-A-2	Cylinder Head Torque	May 1974	74-A-2	Austin Marina
74-A-3	Oil Filter	May 1974	74-A-3	1974 Austin Marina & MGB
74-A-4	Revised Water Pump	June 1974	74-A-4	Austin Marina – MGB
74-A-5	Replacement Fuel Pump	August 1974	74-A-5	MGB & MGB/GT
74-A-6	Austin Marina Heat Shield Leakage	September 1974	74-A-6	Marina
74-A-7	Oil Filter Elements	October 1974	74-A-7	MG Midget

Category B – Electrical Systems/Parts #

All 1974 category B, Electrical systems/parts TSBs for Austin & MG.

TSB Number	Subject	Date	View/Download	Applies To
74-B-1	Alternator Damage Diagnosis and Prevention	April 1974	74-B-1	All Models
74-B-2	Induction Manifold Heater and Thermostat	January 1974	74-B-2	Austin Marina
74-B-3	1974 Wiring Diagram	May 1974	74-B-3	MGB & MGB/GT
74-B-4	Batteries	June 1974	74-B-4	All Models

Category C – Car Body #

All 1974 category C, car body TSBs for Austin & MG.

TSB Number	Subject	Date	View/Download	Applies To
74-C-1	Water Leaks	June 1974	74-C-1	Austin Marina

Category D – Gearbox (Transmission) #

All 1974 category D, Gearbox (Transmission) TSBs for Austin & MG.

TSB Number	Subject	Date	View/Download	Applies To
74-D-1	Warranty Service Borg-Warner Transmissions	February 1974	74-D-1	All (Automatic Transmission) Models
74-D-2	Clutch Driven Plate	March 1974	74-D-2	Midget
74-D-3	Prevention of Drive Plate Failure	March 1974	74-D-3	Austin Marina
74-D-6	Third Gear Main Shaft Circlip Failure	April 1974	74-D-6	Austin Marina Manual Transmission
74-D-7	Gearbox Front Cover – Manual Transmission	August 1974	74-D-7	Marina
74-D-8	Gearbox Center Bearing To Circlip End-Float	August 1974	74-D-8	Marina
74-D-9	Gearbox Remote Control Linkage Manual Transmission	August 1974	74-D-9	Marina

Category G – Miscellaneous #

All 1974 category G, miscellaneous TSBs for Austin & MG.

TSB Number	Subject	Date	View/Download	Applies To
74-G-1	Marina Heater Intake Aperture	February 1974	74-G-1	Austin Marina
74-G-2	Smith Instrument Tester Part No. 5001	N/A	74-G-2	All
74-G-3	Required Special Tool and Supplementary Tools	N/A	74-G-3	All
74-G-4	Owner’s Identification Plate	May 1974	74-G-4	All
74-G-5	Seat Belt Interlock Test Unit Type SBM-1X (Pektron) Part #BLT.5006	N/A	74-G-5	All

Category H – Air Conditioning #

All 1974 category H, air conditioning TSBs for Austin & MG.

TSB Number	Subject	Date	View/Download	Applies To
74-H-1	Anti-Freeze	October 1974	74-H-1	All

Other Materials #

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