BSA M20 - Crankcase Half of Engine (Exploded View)

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THE ENGINE – EXPLODED VIEW

Fig.4. Crankcase half of engine (exploded view)

Main Page

Index2
Useful Data4
The Lubrication System6
Lubrication Chart7
Lubrication Chart8
The Engine - Exploded View9
Top Half of Engine (Exploded View)9
Crankcase Half of Engine (Exploded View)10
Engine Adjustments11
Oil Pressure Valves11
Exhaust Valve Lifter11
Tappet Adjustment11
Ignition Timing12
Instructions for Setting Tappets12
Magneto Pinion Extractor12
Carburetor13
Sparking Plug13
Needle Position13
Throttle Stop13
Engine Dismantling for Decarbonising14
Removing Cylinder Head14
Removing Cylinder Barrel14
Removing the Valves14
Removing Engine from the Frame and Complete Dismantling15
Piston and Rings15
Removing Chaincase15
Removing Clutch16
Dismantling the Engine16
Removing Magdyno Pinion16
Angle Bracket for Mounting Engine16
Oil Pump Spindle Locking Plunger17
Ballrace Extraction (Gearside)17
Cam Pinion Spindle Extractor18
Two Scoops Diametrically Opposite, Ground after Liner Is Pressed in18
Re-Assembling the Engine19
Flywheels19
Checking Flywheel Alignment19
Method of Correcting Flywheels out of Alignment19
Crankcase20
Timing Gears20
Valve Timing Marks20
Cylinder and Piston21
Cylinder Head Bolts21
Assembly of Chaincase and Footrest21
Transmission23
Clutch Adjustment23
Front/Rear Chain Adjustment23
Dismantling and Re-Assembling the Clutch24
Wheel Alignment Gauge24
Clutch Extractor Tool24
Re-Assembly of the Clutch25
Clutch Assembly Tool25
Section through Clutch25
Removal of Gearbox26
Dismantling the Gearbox26
Gearbox Fixture26
Pinion Sleeve Removal Tool26
Dismantling the Gearchange Mechanism27
Re-Assembly of the Gearbox and Gearchange Mechanism27
Gear Train27
Selector Quadrant27
Re-Assembly of the Gearchange28
Special Instructions for the Cleaning and Lubrication of Hubs30
Replacement of the Gearbox30
Adjustment, Dismantling and Re-Assembly of Hubs and Brakes31
Rear Hub31
Section through Rear Hubs31
Adjustments to Steering Head and Front Forks33
Front Hub33
Brake Adjustment33
Brake Relining33
Removal and Dismantling of Front Forks and Steering Head34
Headlamp Connections34
Steering Head Ballrace Extractor34
Chain Alternations and Repairs35
How to Use the Chain Rivet Extractor35
To Shorten a Worn Rear Chain35
To Repair a Damaged Chain35
How to Measure Wear in a Motor Cycle Chain36
The Electrical Equipment37
The Wiring System37
Simple Wiring Diagram for Models Fitted with Ammeter37
Simple Wiring Diagram for Models Fitted Without Ammeter37
Wiring Diagram in Models Fitted with Ammeter38
Wiring Diagram for Models Without Ammeter38
Ignition (Section A)39
Lubrication39
Adjustment39
Contact Breaker with Cover Removed39
Exploded View of Components of the Slipping Clutch40
Slipping Clutch Showing the Jig to Lock the Larger Gear40
Exploded View of Magneto Portion of Dynamo40
Magneto Earthing Brush41
Method of Removing Outer Journals of Bearings41
Tool for Fitting Outer Journals of Bearings42
Magneto Contact Breaker End Showing Fitting of Cam, Timing Control and Shims42
Contact Breaker Assembly42
Method of Checking Clutch Setting42
Charging43
Dynamo Type E3HM43
Dynamo Testing in Position43
Dynamo with Cover Band Removed to Show Brush Gear43
Exploded View of Dynamo44
Dynamo – Dismantling44
Dynamo Brushes44
Dynamo - Commutator44
Dynamo – Field Coil45
Dynamo - Armature45
Dynamo – Bearings45
Method of Undercutting Mica45
Dynamo – Re-Assembly46
Cut-Out and Regulator Unit, Type MCR146
Regulator – Testing in Position46
Removing the Ballrace46
Regulator – Cleaning the Contacts47
Regulator – Mechanical Setting47
Cut-Out47
Regulator Adjustment and Setting47
Ammeter, Type CZ2748
Battery, Type PUW7E48
Checking Battery Condition48
Lighting and Accessories49
Headlamp, Type DU4249
Removing Lamp Front and Reflector49
Headlamp – Reflector Partially Removed49
Horn, Type HF123550
Headlamp, Type du 4250
Horn Showing Adjusting Screw50
Headlamp, Type DU42 with Reflector Partially Removed50
Change-Over Switch51
Main Lighting Switch51
Panel Containing Change-Over Switch, Removed from Headlamp51
Tool Kit Supplied with the Machine52
Additional Equipment52

BSA M20 - Crankcase Half of Engine (Exploded View)

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