Segment:
Sporty compact car, performance variant of the classic Mini
Key Competitors:
Other small sporty coupes and hatchbacks of the era, but unique in its rear-wheel-drive, transverse engine layout and lightweight construction.
Design Philosophy:
Maximizing interior space and performance within a compact footprint, iconic British motoring experience.
Manual Value Proposition:
Enables owners and technicians to perform professional-level maintenance and repairs, saving costs and ensuring longevity of a classic vehicle.
Powertrain:
Engine (1275cc), Transmission (4-speed manual), Clutch, Fuel System, Ignition System, Exhaust System
Chassis And Suspension:
Suspension (hydrolastic/rubber cone variants), Steering, Brakes (front disc, rear drum), Wheels and Tires
Electrical:
Wiring Diagrams, Lighting, Ignition, Starting System, Charging System, Instrumentation
Body:
Body Panels, Doors, Windows, Interior Trim, Seats, Body Sealing
Cooling System:
Radiator, fan, water pump, thermostat, and hoses – diagnosis and replacement.
Fuel System:
Carburetor types (SU/Stromberg), fuel pump (mechanical), fuel lines, and tank – repair and adjustment.
Ignition System:
Distributor, coil, spark plugs, high-tension leads, ignition timing procedures.
Maintenance:
Scheduled Maintenance, Tune-ups, Fluid Checks and Changes, Lubrication
Repair And Overhaul:
Engine disassembly and assembly, Transmission overhaul, Brake system repair, Suspension component replacement, Electrical system troubleshooting
Diagnostics:
Troubleshooting guides for common problems, fault diagnosis procedures
Engine Disassembly:
Complete engine disassembly and reassembly procedures, including cylinder head, piston, crankshaft, and bearing services.
Transmission Disassembly:
Detailed steps for removing, disassembling, and reassembling the gearbox and final drive unit.
Level Of Detail:
Detailed, assumes general automotive knowledge. Covers component-level repair and adjustments, including proprietary component manufacturer instructions.
Special Tools:
Manual identifies recommended or required special tools by Mini part numbers, aiding in precision work.
Engine Type:
Inline-4, SOHC (Overhead Camshaft)
Displacement:
1275 cc (77.7 cu in)
Bore X Stroke:
70.6 mm x 81.3 mm (approx.)
Horsepower:
Approx. 60-70 bhp (varies by specific tune and emissions regulations)
Torque:
Approx. 70-75 lb-ft (varies)
Carburetion:
Typically a single SU HS4 or Zenith-Stromberg CD carburetor.
Fuel Type:
Leaded or Unleaded gasoline (depending on era and specific engine tuning)
Oil Type Recommendation:
Refer to manual for specific API/ACEA classifications and viscosities (e.g., 20W50 is common).
Type:
4-speed manual transaxle
Automatic Transmission:
Not typically offered or common for the 1275 GT variant.
Gear Ratios:
Specific ratios available in manual (e.g., close-ratio options may exist).
Oil Type:
Refer to manual for specific gear oil (e.g., EP 90).
Capacity:
Approx. 1.7 liters (refer to manual for exact capacity).
Length:
Approx. 3050 mm (120 in)
Width:
Approx. 1400 mm (55 in)
Height:
Approx. 1320 mm (52 in)
Wheelbase:
Approx. 2040 mm (80 in)
Curb Weight:
Approx. 650-700 kg (1430-1540 lbs)
Gross Vehicle Weight Rating:
Refer to manual or VIN plate.
Cargo Volume:
Limited, but rear seats can fold for additional space.
Wheel Size:
Typically 10-inch or 12-inch wheels (rims).
Tire Size Example:
145/80 R10 or 165/70 SR12 (depending on original fitment).
Bolt Pattern:
4x100 mm (4x3.94 inches) common for later models, earlier could vary. Check manual for specifics.
Crash Test Data:
Not extensively tested by modern standards. Designed for an era with different safety regulations.
Braking System:
Front disc brakes, rear drum brakes.
Seat Belts:
Lap belts standard, optional shoulder belts in later models. Manual covers installation and adjustment.
Construction:
Monocoque (unibody) construction with integrated safety cage elements.
Manual Emphasis:
Manual stresses the importance of using safety equipment and observing precautions, including torque wrench usage.
Oil Change Interval:
Typically every 3,000-5,000 miles or 6-12 months (refer to manual for exact recommendations).
Tune Up Interval:
Annual or as needed, covering spark plugs, ignition timing, carburetor adjustment.
Engine Oil Grade:
Refer to manual for specific SAE viscosity (e.g., 20W50, 10W40, depending on climate and year).
Coolant Type:
Ethylene glycol-based antifreeze/coolant, mixed with distilled water. Manual will specify ratio and type.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (refer to manual).
Rust And Corrosion:
Common issue due to age and materials; manual may offer body repair and rust prevention guidance.
Suspension Wear:
Hydrolastic or rubber cone suspension can wear; manual details inspection and replacement procedures.
Carburetor Tuning:
Carburetors can require frequent adjustment for optimal performance and fuel economy; manual provides detailed tuning procedures.
Electrical Gremlins:
Older wiring can degrade; manual's wiring diagrams are crucial for troubleshooting.
Manufacturer:
British Motor Corporation (BMC), later British Leyland
Development:
Evolved from the original Mini design, the 1275 GT was a sportier, more powerful variant, often associated with performance upgrades and styling cues.
Market Positioning:
Positioned as a more performance-oriented and stylish option within the Mini range, targeting younger drivers and enthusiasts.
Production Years:
1969-1980
Manufacturing Locations:
United Kingdom (primarily Longbridge)
