Norton 850 Commando Mark 3 Workshop Manual 1975 Onwards
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This manual covers the 850 Commando Mark 3, produced from 1975 onwards. As an iconic British motorcycle, the Commando is renowned for its performance and engineering. The Mark 3 variant...
This manual covers the 850 Commando Mark 3, produced from 1975 onwards. As an iconic British motorcycle, the Commando is renowned for its performance and engineering. The Mark 3 variant introduced key advancements such as electric start, an improved oil-in-frame chassis, and a standard front disc brake, solidifying its status as a sought-after classic. This workshop manual provides factory-level detail essential for understanding and maintaining this celebrated machine.
This comprehensive workshop and service repair manual is designed for 850 Commando Mark 3 owners and technicians. It offers A-Z repair coverage, including detailed procedures for engine overhaul, transmission service, brake systems, electrical systems, and much more. With hundreds of illustrations, diagrams, and wiring schematics, this manual provides step-by-step instructions and technician-level diagnostic information, making it an indispensable resource for maintaining and repairing your vehicle to factory standards.
🏷️ Basic Information
Identification
Make:
Norton
Model:
850 Commando
Generation:
Mark 3
Production Years Covered:
1975 onwards
Codes
Vin Decoder Information:
Not explicitly stated, but implied through factory detail
👋 Introduction
Market Position
Target Audience:
Norton 850 Commando Mark 3 owners and technicians
Value Proposition:
Enables DIY repairs, saving money and providing factory-level knowledge.
Competitive Analysis
Differentiation:
Vehicle-specific, factory-level detail, not generic information.
Key Features
Key Selling Point:
Instant download for immediate access.
Technical Resource Comparison:
Equivalent to manuals used by dealership technicians.
📋 Manual Details
Coverage Areas
All Models Covered:
Yes
Repair Scope:
A-Z (all repairs)
Page Count
Page Count:
Not specified, but described as 'factory highly detailed' and 'hundreds of illustrations'
Manual Type
Manual Type:
Workshop Manual / Service Repair Manual
Language
Language:
English
Format
File Format:
PDF
Delivery Method:
Instant Download
Compatibility:
Windows (7, Vista 32/64, XP, ME, 98, NT, 2000), Mac OS
Software Requirements:
Adobe PDF Reader
📖 Manual Coverage
Systems Covered
Engine Overhaul:
Yes
Clutch Service:
Yes
Brake System:
Yes
Sunroof Service:
Yes
Chain Maintenance:
Yes (removal and tightening)
Timing Belt Service:
Yes (replacement and procedures)
Wiring Systems:
Yes (schematics included)
Engine Performance:
Yes
Front End And Alignment:
Yes (procedures and specifications)
Suspension System:
Yes
Transmission Service:
Yes (removal, installation, in-car servicing)
Air Conditioning Service:
Yes (service and capacities)
U Joint And Cv Joint Service:
Yes
Vacuum Systems:
Yes (vacuum diagrams included)
Procedures Included
Diagnostic Trouble Codes:
Yes
Troubleshooting:
Yes
Diagnostic Charts:
Yes (computer diagnostic trouble tree charts)
Firing Orders:
Yes
Maintenance Schedules:
Yes (factory maintenance schedules and charts)
Serpentine Belt Routings:
Yes (with diagrams)
Brake Servicing:
Yes
Driving Concerns:
Yes
General Repair Procedures:
Yes (step-by-step instructions)
Technical Depth
Detail Level:
Factory High Detail
Instruction Format:
Step-by-step instructions
Visual Aids:
Diagrams, Illustrations, Wiring Schematics
Diagnostic Approach:
Technician-level
Completeness Statement:
The only service repair workshop manual you will ever need.
📊 Manual Specifications
File Format
PDF Quality:
High Quality, Printable, Zoomable Images
Searchability:
Implied by PDF format, facilitating easy text searching of technical information.
Print Quality
Printability:
All pages printable
Image Enhancement:
Ability to blow up images for enlarged copies
Binding Type
Binding Type:
N/A (Digital Download)
Paper Type
Paper Type:
N/A (Digital Download)
⚙️ Engine Specifications
Primary Engine
Engine Type:
Parallel-Twin (Air-cooled)
Displacement:
828 cc (50.5 cubic inches)
Bore X Stroke:
77 mm x 89 mm (approximate, check manual for precise figures)
Compression Ratio:
Typically 8.2:1 or 9.0:1 depending on variant (check manual)
Power Output:
Approximately 50-55 bhp (check manual for specific figures)
Torque Output:
Approximately 47-50 lb-ft (check manual for specific figures)
Performance
Top Speed:
Approx. 110 mph (177 km/h)
Fuel System
Carburetion:
Twin Amal Mk2 Concentric Carburetors (typically 32mm or 34mm)
Fuel Type:
Unleaded gasoline (check manual for octane rating recommendations)
Engine Components
Valve Train:
Overhead Valves (OHV), Pushrod Actuated
Ignition System:
Electronic Ignition (e.g., Boyer Bransden, Lucas electronic)
Lubrication System:
Wet Sump
Oil Capacity:
Approximately 4 Imperial pints (2.27 liters) - consult manual for exact figure and type.
🔧 Transmission
Standard
Transmission Type:
5-speed Constant Mesh Gearbox (Integrated with Engine/Clutch Unit)
Optional
Optional Transmissions:
N/A
Features
Clutch Type:
Wet Multi-plate
Gear Ratios:
Specific ratios covered in manual
Final Drive:
Chain Drive
Transmission Oil Type:
Refer to manual for specific API GL specification and viscosity.
📐 Dimensions
Exterior
Wheelbase:
Approx. 56.5 inches (1435 mm)
Length:
Approx. 84 inches (2134 mm)
Weights
Dry Weight:
Approx. 400-430 lbs (181-195 kg)
Fuel Tank Capacity:
Approx. 3.5 Imperial Gallons (15.9 Liters)
Oil Tank Capacity:
Separate oil tank, capacity specified in manual.
🛡️ Safety Features
Ratings
Crash Test Results:
N/A (Vintage Motorcycle)
Active Features
Braking System:
Front Disc Brake (often with dual discs on later models), Rear Drum Brake
Suspension Front:
Telescopic Forks (leading axle design)
Suspension Rear:
Swingarm with Dual Shock Absorbers
Passive Features
Lighting System:
Headlight, Taillight, Turn Signals (coverage in wiring diagrams)
💡 Technology Features
Infotainment
Infotainment System:
N/A (Vintage Motorcycle)
Driver Assistance
Driver Assistance Features:
N/A (Vintage Motorcycle)
Connectivity
Connectivity Features:
N/A (Vintage Motorcycle)
Electrical System
Charging System:
Alternator and Rectifier/Regulator (specific types covered in manual)
Battery Type:
12V Lead-Acid (specific capacity and type detailed in manual)
🔧 Maintenance
Service Intervals
Oil Change Interval:
Refer to manual; typically every 2,000-3,000 miles or annually.
Tune Up Interval:
Refer to manual; typically involves spark plug check, carburetor adjustment, chain adjustment, brake adjustment.
Fluid Specifications
Engine Oil Type:
Refer to manual for recommended SAE viscosity (e.g., 20W-50) and API rating.
Brake Fluid Type:
DOT 3 or DOT 4 recommended for disc brake systems (verify with manual).
Transmission Oil Type:
Refer to manual for specific grade and API classification (e.g., GL-4).