MG MGA Twin Cam User Manual

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©2018 morrisgarages.ch

Table of Contents

Introduction3
- Table of Contents5
General Information12
- Part Name Alternatives23
Maintenance Attention28
Section a the Engine36
- General Description36
- Lubrication System36
- Draining the Sump36
- Oil Pressure37
- Oil Pressure Relief Valve37
- Water Pump37
- Carburetters37
- Inlet Manifold38
- Header Tank39
- Thermostat Housing39
- Exhaust Manifolds39
- Camshaft Driving Sprockets39
- (Transverse Section) the M.G. Series MGA (Twin Cam) ENGINE41
- Camshafts41
- Camshaft Bearings42
- Cylinder Head42
- Decarbonizing43
- Valves43
- Valve Guides43
- Valves and Seatings44
- Tappet Clearances45
- Valve Timing-Checking and Adjusting46
- Timing Chain-Adjusting50
- Timing Chain Cover51
- Timing Chain52
- Engine Front Plate53
- Power Unit53
- Sump and Oil Pump Strainer54
- Main and Big-End Bearings54
- Pistons and Connecting Rods55
- Piston Rings56
- Half-Speed Shaft57
- Distributor Drive Gear57
- Oil Pump58
- Flywheel58
- Crankshaft59
- Camshaft Locking Tool59
- Flywheel Starter Rings59
- Connecting Rod Assemblies59
- Modified Engine Mounting60
- Modified Half-Speed Shaft and Oil Pump Driving Spindle61
- Modified Pistons and Rings61
- Modified Crankcase Breather Pipe61
- Modified Tappets61
- Modified Timing Cover Gasket61
- Alternative Pistons61
- Service Tools62
Section B the Ignition System68
- Description68
- Locating the Cause of Uneven Firing68
- Testing the Low-Tension Circuit68
- Locating a Low-Tension Circuit Fault69
- High-Tension Cables70
- Contact Breaker70
- Removing and Replacing the Distributor71
- Static Ignition Timing71
- Dismantling the Distributor74
- Capacitor74
- Reassembling the Distributor74
- Coil75
- Sparking Plugs75
- New-Type Distributor77
- Checking Distributor Drive Shaft Backlash77
- Checking the Ignition Timing79
- New-Type Distributor79
Section C the Cooling System80
- Description80
- Removing the Filler Cap80
- Draining the Cooling System80
- C3 Filling the Cooling System81
- Removing and Replacing the Radiator81
- Dynamo and Fan Belt Adjustment81
- Cold Weather Precautions83
- C7 Removing the Water Pump83
- Dismantling and Reassembling the Water Pump83
- The Water Pump and Thermostat Components85
- Key to the Water Pump and Thermostat Components86
- Radiator Pressure Valve87
- The Cooling System Components89
- Key to the Cooling System Components89
Section D the Fuel System91
- Key to the Carburetter Components92
- Removing the Fuel Tank93
- Removing the Fuel Pump93
- Construction of the Fuel Pump93
- Action of the Fuel Pump94
- Dismantling and Reassembling the Fuel Pump94
- Resetting the Diaphragm for Contact Breaker "Throw-Over97
- D7. Tracing Fuel Pump Troubles99
- Fuel Pump Maintenance100
- Carburetters100
- Carburetter Adjustments101
- Removing and Replacing the Carburetters104
- Centering the Jet105
- Sources of Carburetter Trouble105
- Air Cleaners107
- Modified Carburetter Damper Assemblies107
Section E the Clutch108
- General Description109
- Adjustment110
- Master Cylinder111
- Slave Cylinder112
- Bleeding the Clutch System113
- Removing the Clutch113
- Dismantling the Clutch114
- Assembling the Clutch115
- Adjusting the Release Levers115
- Refitting the Clutch116
- Servicing the Clutch116
- Service Tools120
Section F121
- The Gearbox121
- General Description124
- Removing the Gearbox124
- Dismantling the Gearbox124
- Dismantling the Third Motion Shaft125
- Assembling the Third Moton Shaft125
- Layshaft Gear125
- Assembling the First Motion Shaft126
- Assembling the Rear Extension126
- Assembling the Gearbox126
- Renewing the Gearbox Extension Oil Seal127
- Refitting the Gearbox127
- Service Tools128
Section G the Propeller Shaft131
- General Description131
- Lubricating the Universal Joints131
- Testing for Wear131
- Removing the Propeller Shaft132
- Dismantling the Propeller Shaft132
- To Examine and Check for Wear134
- Reassembling the Shaft134
- Replacing the Propeller Shaft134
- Modified Propeller Shaft135
Section H the Rear Axle136
- Key to the Rear Axle Components137
- General Description138
- Lubrication138
- Removing and Replacing a Hub Extension and Axle Shaft139
- Removing and Replacing a Hub139
- Renewing the Bevel Pinion Oil Seal140
- Removing the Differential Pinions140
- Replacing the Differential Pinions141
- Dismantling the Crown Wheel and Pinion141
- Assembling and Setting the Crown Wheel and Pinion142
- Removing and Refitting the Axle151
- Service Tools154
Section J the Steering Gear158
- Key the Steering Gear159
- General Description160
- Maintenance160
- Removing and Replacing the Steering Wheel160
- Removing the Steering Column161
- Removing the Steering Column Bushes161
- Removing the Steering Column Universal Joint161
- Dismantling the Universal Joint161
- Removing and Replacing the Steering Gearbox162
- Dismantling the Steering Gearbox162
- Reassembling the Steering Gear163
- Steering Column Alignment164
- Checking and Adjusting Front Wheel Alignment165
- Fitting an Adjustable Steering Column166
- Service Tools166
Section K the Front Suspension167
- Key to the Front Suspension Components168
- General Description168
- Removing the Front Suspension169
- Dismantling the Swivel Pins170
- Examining Parts for Wear170
- Reassembling the Swivel Pins171
- Replacing the Front Suspension172
- Removing and Dismantling a Front Hub173
- Reassembling and Replacing a Front Hub173
- Adjusting the Front Hub Bearings173
- Removing and Replacing the Front Coil Spring174
- Fitting New Rubber Bushes175
- Anti-Roll Bar Assembly176
- Fitting the Anti-Roll Bar176
- Service Tools177
- The Anti-Roll Bar Equipment Components178
Section L the Hydraulic Dampers179
- Maintenance179
- Topping up179
- Removing and Replacing Rear Dampers179
- Removing a Front Damper180
- Testing the Dampers180
Section M the Braking System181
- General Description181
- Brake Units181
- Master Cylinder181
- Maintenance182
- Adjusting the Brake Pedal182
- PRIMING and BLEEDING the BRAKE SYSTEM (Expelling Air)183
- Removing the Master Cylinder183
- Dismantling the Master Cylinder184
- Assembling the Master Cylinder184
- Replacing the Master Cylinder185
- Removing a Brake Unit185
- Dismantling a Brake Unit186
- Assembling a Brake Unit187
- Replacing a Brake Unit188
- Removing the Friction Pads188
- Replacing the Friction Pads188
- Relining the Hand Brake189
- Adjusting the Hand Brake189
- Removing the Hand Brake Cable190
- Removing a Brake Disc190
- Replacing a Brake Disc190
- Flexible Hoses191
- Service Tool192
Section N. Electrical Equipment193
- General Description193
- Battery Maintenance193
- Dynamo195
- Removing and Replacing the Dynamo196
- Dismantling the Dynamo196
- Servicing the Dynamo196
- The Starter199
- Removing and Replacing the Starter199
- Servicing the Starter199
- The Control Box201
- Fuses204
- The Electric Horn204
- Flashing Direction Indicators204
- The Windshield Wiper205
- The Headlamps207
- The Light Units207
- Removing the Light Units207
- Setting the Headlamps207
- Replacing Headlamp Bulbs208
- Replacing the Light Units209
- The Tail-Lamps and Stop-Lights209
- Cleaning the Lamps209
- The Sidelamps209
- The Number-Plate Illumination209
- The Panel and Warning Lights210
- Wiring Diagram211
- Key to Wiring Colours213
- Replacement Bulbs213
- Fitting a Fog Lamp214
- Location and Remedy of Faults214
- Charging Circuit215
- Starter Motor215
- Lighting Circuits216
- Windowless Yoke Dynamo216
- Modified Control Box216
- Headlamp Beam Setting217
- Dry-Charged Batteries217
- Modified European Light Unit218
Section Nn (Mga 1600)219
- Key to Wiring Diagram (R.h.D., and L.h.D.)221
- Cable Colour Code221
- Nn.1 Front Pilot and Flashing Indicator Lamps222
- Nn.2 Rear Flashing Indicator Lamps222
- Nn.3 Replacement Bulbs222
- Nn.4 Headlamps223
- Nn.5 Lucas C4011 Dynamo223
- Nn.6 Dismantling a C40/1 Dynamo223
- Nn.7 Servicing a C40/1 Dynamo225
- Nn.8 Modified Rb106/2 Control Box225
- NN.9 Mk. II SEALED-BEAM HEADLAMPS226
Section O the Wheels, Tyres, and Jacking227
- General227
- Tyre Maintenance227
- Jacking up the Car228
- Removing and Replacing Road Wheels228
- Valves229
- Tyre Removal229
- The Importance of Balance230
- Fitting Tyres and Tubes230
Section P Lubrication234
- Daily Service235
- 1,000 MILES (1600 Km.) SERVICE235
- 3,000 MILES (4800 Km.) SERVICE237
- 6,000 MILES (9600 Km.) SERVICE239
- 12,000 MILES (19200 Km.) SERVICE243
Section R the Chassis245
- General Description245
- Frame Repairs245
- Investigation of Damaged Chassis246
- A Twisted Frame246
- Diagonal Frame Check248
Section S the Body249
- Removing a Door Lock249
- Removing the Windshield249
- Removing the Front Bumper249
- Removing the Rear Bumper250
- Removing the Hood250
- Removing a Rear Wing250
- Removing a Front Wing250
- Removing the Body251
- Fitting the Optional Heating and Demisting Equipment252
- Cold Air Ventilation Equipment255
- Maintenance of Bodywork and Upholstery258
- Reglazing the Windshield258
- Removing the Windshield (Coupé)259
- Removing and Replacing the Rear Light260
- Removing a Door Lock or Window Regulator (Coupé)261
- Removing the Head Liner (Coupé)262
- Modified Wheel Arches262
- Modified Bodies262
Lubrication Chart263
- Key to Lubrication Chart264

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MG MGA Twin Cam Specifications

General

Engine Type	Inline 4-cylinder
Displacement	1588 cc
Compression Ratio	9.9:1
Valvetrain	DOHC
Bore x Stroke	75.4 mm x 88.9 mm
Torque	104 lb-ft @ 4500 rpm
Fuel System	Twin SU carburetors