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MG MGA Twin Cam User Manual

MG MGA Twin Cam
265 pages
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©2018 morrisgarages.ch

Table of Contents

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MG MGA Twin Cam Specifications

General IconGeneral
Engine TypeInline 4-cylinder
Displacement1588 cc
Compression Ratio9.9:1
ValvetrainDOHC
Bore x Stroke75.4 mm x 88.9 mm
Torque104 lb-ft @ 4500 rpm
Fuel SystemTwin SU carburetors

Summary

INTRODUCTION

UNIT ARRANGEMENT

Vehicle divided into sections for each assembly or major component.

NUMBERING OF PAGES AND ILLUSTRATIONS

Pages and illustrations numbered consecutively within each section.

SERVICE TOOLS

Importance of correct tools for efficient repair. References made throughout the manual.

SECTION A THE ENGINE

LUBRICATION SYSTEM

Details the engine's oil pump, relief valve, galleries, and oil flow to various components.

A.1 DRAINING THE SUMP

Instructions for draining engine oil from the sump.

A.2 OIL PRESSURE

Information on normal and low oil pressure readings and troubleshooting checks.

SECTION B THE IGNITION SYSTEM

DESCRIPTION

Overview of the distributor, automatic advance, and electrical system.

B.1 LOCATING THE CAUSE OF UNEVEN FIRING

Troubleshooting engine misfires and identifying the faulty cylinder.

B.2 TESTING THE LOW-TENSION CIRCUIT

Checking continuity and function of the low-tension ignition circuit.

SECTION C THE COOLING SYSTEM

DESCRIPTION

Cooling system components, water circulation, and thermostat operation.

C.1 REMOVING THE FILLER CAP

Procedure for safely removing the header tank filler cap, especially when hot.

C.2 DRAINING THE COOLING SYSTEM

Procedure for draining coolant from the radiator and engine block.

SECTION D THE FUEL SYSTEM

KEY TO THE CARBURETTER COMPONENTS

Diagram and list of parts for the carburetter system.

D.1 REMOVING THE FUEL TANK

Steps for removing the fuel tank and its associated components.

D.2 REMOVING THE FUEL PUMP

Procedure for removing the fuel pump from the vehicle.

SECTION E THE CLUTCH

GENERAL DESCRIPTION

Overview of the single-plate dry-disc hydraulic clutch system.

E.1 ADJUSTMENT

Essential clutch pedal clearance adjustment procedure.

SECTION F THE GEARBOX

GENERAL DESCRIPTION

Details gearbox layout, gear engagement, and lubrication.

F.2 DISMANTLING THE GEARBOX

Comprehensive procedure for disassembling the gearbox.

SECTION H THE REAR AXLE

GENERAL DESCRIPTION

Rear axle type, hypoid gears, and suspension components.

LUBRICATION

Axle oil filling, type, and inspection intervals.

SECTION J THE STEERING GEAR

GENERAL DESCRIPTION

Steering gear operation, rack and pinion type, and backlash.

J.1 REMOVING AND REPLACING THE STEERING WHEEL

Steps for removing and refitting the steering wheel.

SECTION K THE FRONT SUSPENSION

GENERAL DESCRIPTION

Independent front suspension, wishbone type, coil springing, and steering.

K.1 REMOVING THE FRONT SUSPENSION

Procedure for removing the front suspension assembly from the car.

SECTION M THE BRAKING SYSTEM

GENERAL DESCRIPTION

Braking system overview, Dunlop calipers, and master cylinder control.

MASTER CYLINDER

Components and operation of the brake master cylinder.

SECTION N. ELECTRICAL EQUIPMENT

GENERAL DESCRIPTION

12-volt system, positive earth, battery access, dynamo, starter, and headlamps.

N.1 BATTERY MAINTENANCE

Periodic inspection, topping up electrolyte, and testing battery condition.

TESTING THE CONDITION OF THE BATTERY

Using a hydrometer to check battery charge levels.

SECTION O THE WHEELS, TYRES, AND JACKING

GENERAL

Spare wheel location, tyre pressure, jack, and pump.

O.1 TYRE MAINTENANCE

Tyre wear, pressure testing, rim cleaning, and brake/clutch adjustments.

O.2 JACKING UP THE CAR

Correct procedure for jacking front and rear wheels.

SECTION P LUBRICATION

P.1 DAILY SERVICE

Checks for engine, steering, gearbox, rear axle, hand brake, propeller shaft, carburetters.

P.2 1,000 MILES (1600 Km.) SERVICE

Routine service checks at 1,000 miles.

SECTION R THE CHASSIS

GENERAL DESCRIPTION

Repairing accident-damaged box-section chassis without dismantling.

R.1 FRAME REPAIRS

Methods for frame repair using gas-welding, jacks, and heat.

SECTION S THE BODY

S.1 REMOVING A DOOR LOCK

Steps for removing the door lock and trim panel.

S.2 REMOVING THE WINDSHIELD

Procedure for removing the windshield glass and frame.

S.3 REMOVING THE FRONT BUMPER

Steps for removing the front bumper and its brackets.