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Technical Data
for the MG Y Series

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  Get Adobe Acrobat Reader free here.

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 - mm

Sheet 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 Fasteners

A link to a technical discussion of Thoughts on Torque and Tightening for Critical Fasteners

General Data Summaries

Wiring Diagrams

MG YA - Source Original Workshop Manual

MG YT - Source Lucas Equipment Sheets for the YT

MG YB - Source Original Workshop Manual

  1. MG YA wiring diagram Y 0251 - Y 0583 Control Box Lucas RF.91

  2. MG YA wiring diagram for cars for use in USA Control Box Lucas RF.95

  3. MG YA wiring diagram commencing Y 0584 Control Box Lucas RF.95

  1. MG YT wiring diagram Home and Right Hand Drive Export

  2. MG YT wiring diagram Left Hand Drive Export

  3. MG YT EXU - additional details to standard LHD cars for EXU cars only - source T O'Brien

  4. MG YT EXU 1949 standard LHD cars for EXU cars Control Box Lucas RF.91 only

  5. MG YT EXU - 1951 - 1952 standard LHD cars for EXU cars  Control Box Lucas RF.95 only

  6. YT Lighting and Ignition Switch

  1. MG YB wiring diagram YB 0251 - YB 0326 Control Box Lucas RF.95 - same as late YA!

  2. MG YB wiring diagram commencing YB 0327 with single horn

  3. MG YB wiring diagram commencing YB 0327 with twin windtone horn

SU Carburettors - Exploded parts diagrams

Differences between the MG YA and the MG YB

MG YA / YB - that is the question ... by Neil Cairns

 SU Fuel Pump

SU Fuel Pump overhaul

Problem Solving Diagnostics

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 Home Market Publication's Salesman's Reference 1952. 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.

Service Parts Price List

A Service Parts Price List for MG Y Parts reproduced here.

Modern Petrol and Classic Cars - the Manchester XPAG Tests

Modern Petrol and Classic Cars - the Manchester XPAG Tests by Paul Ireland reproduced here.