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End of Menu Items |
 | Technical Data |  |
In this suite of pages we will bring you General Data sheets for the MG YA, YT and YB, and wiring diagrams for original "standard" wiring layouts. Please note that these are based on original factory manual information only: they may not necessarily reflect your car as, over the years, your car may have been heavily modified by previous owners. Furthermore, your attention is drawn to our DISCLAIMER.
For those of you who are not fully conversant with the differences between the MG YA and YB saloon, Neil Cairns has authored a page to highlight the differences too. All files are in PDF Format for which you will need Adobe Acrobat Reader. If you have not got this installed on your PC you can download it free here 
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Modifications to the MG Y and the MG YB- a reproduction of an original Service Technical Library document can be downloaded here. | |
Differences between the MG YA and the MG YB |
General Data Summaries |
Generators and Control Boxes |
Problem Solving Diagnostics |
Rebuilding Starter motors |
Size Matters |
Spark Plug Diagnosis |
SU Carburettors |
SU Fuel Pump |
Wiring Diagrams |
Lucas Overseas Technical Correspondence Course |
Salesman's Reference Book - MG YB section only |
Service Parts Price ListA Service Parts Price List for MG Y Parts reproduced here. |
Modern Petrol and Classic Cars - the Manchester XPAG TestsThe complete files from the Manchester XPAG Tests by Paul Ireland are reproduced here. |
Lucas Equipment and Spare Parts List, 1953A Lucas catalogue of Equipment and Spare Parts, 1953, reproduced here. |
Lucas Workshop Instructions |
Lockheed Hydraulic Brake CompanyAn original manual from the Lockheed Hydraulic Brake Company on Single Leading Shoe (Y/YT) brake systems and the maintenance of them reproduced here. |
Lockheed Hydraulic Brake CompanyAn original manual from the Lockheed Hydraulic Brake Company on Twin Leading Shoe (YB) brake systems and the maintenance of them reproduced here. |
The Morris Oxford braking systemAlthough this article is specifically written about the Morris Oxford braking system, much of the same principles can be used on both the MG Y/YT and YB for maintenance and overhaul click here. | |
Hydraulic BrakesThis article is general article on brake maintenence. Many of the same principles can be used on both the MG Y/YT and YB for maintenance and overhaul click here. The original article was first published in The New Outlook on Motoring, January 1948. | |
The Carburetter No. 2A general article on carburetter maintenence. Many of the same principles can be used on both the MG Y/YT and YB for maintenance and overhaul click here. The original article was first published in The New Outlook on Motoring, January 1948. | |
The MG Service InformationAn original manual from the MG Car Company Limited covering all MG Models and their servicing from the MG 14/40 through to the MG Series Y is reproduced here. | |
Technical Information Construction Operation and Service Instructions for Girling Hydraulic DampersAn original manual from the Girling Company covering the technical information, construction, operation and service instructions for their hydraulic dampers reproduced here. Kindly supplied by Karl-Heinz Borchers. | |
Size Matters 
by Dave DuBois, Don Harmer and Tony Slattery
Fasteners, Threads, Torque and Wrench were all originally written for the T Register, they are reproduced here because of the commonality of parts shared between the Y series and the T series. Nuts and Bolts is specifically written for Y Types.
Engine Reassembly Torque Settings and Check List | |||
Fasteners |
Nuts & Bolts |
Threads |
Wrench |
All about Nuts |
Fractions to Decimals to Millimetres | ||
Engine and other torque settings including a table of generic torque settings. |
SWG - Inch - mmSheet metal and wire is measured in the industry by SWG (Standard Wire Gauge). This table convert inches, and millimetres into SWG. | ||
Thoughts on Torque and Tightening for Critical FastenersA link to a technical discussion of Thoughts on Torque and Tightening for Critical Fasteners | |||
General Data Summaries
MG YA and YT General data |
MG YT General data - differences only |
MG YB General data |
Wiring Diagrams
MG YA - Source Original Workshop Manual |
MG YT - Source Lucas Equipment Sheets for the YT |
MG YB - Source Original Workshop Manual |
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MG YA - colour |
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SU Carburettors - Exploded parts diagrams
Single SU |
Twin SUs |
SU H Type Carburettor Technical Data | |
Recommended Needles |
Needle sizes |
Type H Carburettors - Tuning and Servicing | |
Four articles from Motoring magazine 1953 | |||
Motoring |
Motoring |
Motoring |
Motoring |
Differences between the MG YA and the MG YB
MG YA / YB - that is the question ... by Neil Cairns
SU Fuel Pump
The Collected Writings of Dave DuBois
Dave DuBois was a gifted technician who started driving MG sport cars early on, and never ceased driving them as his family's "Daily Drivers". Over the years he used his experiences in the Navy Yards of Bremerton, WA, to bring simple fixes to some of the perplexing problems of our cars, mostly related to electrical contacts, fuel pumps and safety. He became world famous as the go-to guy for SU fuel pump restoration.
For years Dave's writings have been available on his homepage, homepages.donobi.net/sufuelpumps/. With Dave's passing from cancer in January 2019, his writings were no longer available. For almost 50 years he graced those of us in the hobby with solid advice, good humor and perfectly working fuel pumps. He is and will be sorely missed. His son, also Dave DuBois, has granted permission to publish his writings here.
Problem Solving Diagnostics
Maintenance Instructions for Lucas Altette horns as fitted to MG Y and Y/Ts
Problem Solvers originally printed in MG Abingdon Classics magazine, November 1981
Maintenance Instructions for Lucas Electrical Equipment
Running Instructions for the Lucas Coil Ignition Equipment
Instructions for Lucas "Stop" Tail Lamps including ST 50 and ST 52
Spark Plug Diagnosis
Click here to open a page on engine problems that can be diagnosed by inspecting the spark plugs.
Generators and Control Boxes
A reprint of the book produced by Lucas called "Generator and Control Box Tests"
Rebuilding Starter motors
A reprint from Practical Classics magazine, April 2009 on rebuilding your starter motor.
Lucas Overseas Technical Correspondence Course
Salesman's Reference Book
The section from the Nuffield Export Market Publication's Salesman's Reference. Published in 1948, the section applying to the MG Y and YT is reproduced here.
The section from the Nuffield Home Market Publication's Salesman's Reference. Published in 1952, the section applying to the MG YB is reproduced here.
The section from the Nuffield Export Publication's Salesman's Reference. Published in February 1953, the section applying to the MG YB is reproduced here.
Special Tuning for MG Midget
This is a section from the Nuffield Export Publication's for Special Tuning of the XPAG Engine. Published in March 1950 and is reproduced here.
Fitting a 5 speed gearbox
Tony Vernall's notes on fitting a 5 speed gearbox to his YB are reproduced here.