Vehicle Segment:
Lightweight Utility Vehicle / 4x4
Key Competitors:
Land Rover Series (I/II), Willys Jeep, Ford Bronco (early models)
Vehicle Design Philosophy:
Robust, versatile, off-road capable utility vehicle with civilian and military applications.
Target Audience:
Professional technicians and experienced DIY mechanics
Unique Selling Point:
Comprehensive, detailed information equivalent to factory service manuals, facilitating restoration and in-depth repair.
Engine Systems:
Engine overhaul, tuning, lubrication, cooling, fuel, exhaust
Transmission Systems:
Gearbox overhaul, clutch, driveshafts, differentials
Chassis And Suspension:
Frame, axles, springs, shock absorbers, steering
Braking System:
Hydraulic brake system, brake shoes, drums, master cylinder, lines
Electrical System:
Wiring diagrams, ignition system, lighting, starting, charging, instrumentation
Bodywork And Trim:
Body panel repair, doors, windows, interior fittings
Maintenance Procedures:
Regular servicing, lubrication schedules, fluid changes, filter replacements
Diagnostic Procedures:
Troubleshooting guides for common issues, symptom-based diagnostics
Repair Procedures:
Step-by-step instructions for component removal, disassembly, inspection, repair, and reassembly
Rebuild Procedures:
Comprehensive instructions for complete engine, gearbox, and axle rebuilds
Diagnostic Capability:
Advanced diagnostics with detailed troubleshooting and wiring diagrams
Repair Scope:
Full rebuild procedures, specialized repairs, and component-level servicing
Illustrations And Diagrams:
Detailed illustrations, drawings, photos, and wiring diagrams
Engine Type:
Four-cylinder, overhead-valve (OHV) petrol engine
Displacement:
Typically 2.2-litre (2200 cc)
Bore X Stroke:
Approx. 83mm x 101.6mm (specific to engine variant)
Compression Ratio:
Approximately 6.6:1 to 7.2:1 (variant dependent)
Horsepower:
Around 60-70 bhp at ~3000-3500 rpm (variant dependent)
Torque:
Around 110-120 lb-ft at ~1500-2000 rpm (variant dependent)
Carburetion:
Single Zenith, Solex, or SU downdraft carburetor (specific model varies)
Fuel Type:
Leaded or Unleaded Petrol (depending on modification/original spec)
Ignition Type:
Distributor, coil, and points system
Gearbox Type:
4-speed manual synchromesh (often with a 2-speed transfer case)
Optional Gearbox:
Power Take-Off (PTO) unit or auxiliary gearbox for specific applications (e.g., military, industrial)
Drive Layout:
Selectable 4WD (4x4)
Transfer Case:
2-speed transfer case with high/low range
Crash Safety Standards:
Era-appropriate, rudimentary by modern standards. Emphasis on structural integrity for off-road.
Braking System Type:
Hydraulic drum brakes on all wheels (front disc brakes were an option or introduced later on some variants, though unlikely for G4M10 specific to this manual)
Seatbelts:
Optional or not standard fitment for early models
Rollover Protection:
Basic chassis and body structure, roll bar/cage typically an aftermarket or military addition.
Oil Change Interval:
Typically every 3,000 miles or 6 months (depending on usage and oil type)
Grease Points:
Regular lubrication of suspension, steering, and driveshaft U-joints (often weekly or bi-weekly for heavy use)
Engine Oil Type:
SAE 30 or 20W-50 (API SA/SB/SC classification, depending on era and availability, likely single-grade for original spec)
Coolant Type:
Water with anti-freeze (ethylene glycol based) and anti-corrosion additives.
Gearbox Oil Type:
EP 90 Gear Oil (API GL-4 or GL-5)
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid (glycol-based)
Common Wear Items:
Kingpins, wheel bearings, clutch components, U-joints, synchronizers in gearbox.
Rust Prone Areas:
Chassis outriggers, floor pans, wheel arches, door bottoms, bulkhead.
Engine Specific Issues:
Potential for valve seat wear if running on unleaded fuel without hardened inserts, oil leaks from seals.
Manufacturer Origin:
United Kingdom (British Motor Corporation - BMC)
Predecessor:
Austin Champ
Key Innovations:
Versatile chassis design adaptable to various body styles (utility, station wagon, pickup), robust BMC engine.
Production Period:
1958-1967
Manufacturing Location:
Longbridge, Birmingham, England
Military Variant Availability:
Yes, a significant number were produced for military contracts.
