1956-1962 Triumph Thunderbird / Tiger 100 / Trophy / Bonneville Workshop Manual (194 P.)
1956-1962 Triumph motorcycles documentation with engine lubrication, transmission systems, telescopic fork suspension, and electrical components — complete service procedures PN 99-0837
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Models Covered & Key Technical Specifications
Triumph Speed Twin, Thunderbird, Tiger 100, Tiger 110, Trophy TR5, Trophy TR6, Bonneville T120 — 1956–1962 Authorized Technical Reference | Triumph Motorcycle Service Collection.
- Calibrated Engine Displacement: 40 cubic inches (649 c.c.) is specified as the standard cylinder volume for all twin-cylinder models Specification.
- Measured Power Output: 46 horsepower at 6,500 rpm represents the maximum rated engine performance for Bonneville T120 Architecture.
- Primary Torque Specification: The connecting rod big-end journal size is standardized to 1.6235–1.6240 inches (4.1237–4.1250 cm.) for precise bearing fit Matrix.
- Universal Compression Ratio: 8.534:1 compression ratio dictates the optimal combustion chamber pressure for Trophy and T110 models Framework.
- Established Valve Clearance: Inlet valve requires 0.002 inches (0.05 mm.) cold clearance and exhaust valve specifies 0.004 inches (0.10 mm.) — establishing silent operation Standards.
- System Fuel Tank Capacity: The petrol tank reaches 4 gallons (18 litres) maximum capacity for standard solo machine operation Parameters.
Professional Workshop Service Manual & Technical Specifications
Systematic Maintenance Factory Manual: Motorcycle Workshop Instruction Manual: Triumph: Thunderbird, Tiger 100, Trophy TR5, Trophy TR6, Bonneville T120, Speed Twin 1956-1962 Chassis-Documentation
Technical-Scope: Thunderbird (1956-1962), Tiger 100 (1956-1962), Trophy TR5 (1956-1962), Trophy TR6 (1956-1962), Bonneville T120 (1956-1962), Speed Twin (1956-1962) // Model-Portfolio: Triumph twin-cylinder motorcycles, OHV engines, four-speed gearbox systems // Technical-Scope: Comprehensive specifications, torque documentation, electrical systems, hydraulic components.
| Service-Nexus | Value | Context |
|---|---|---|
| Engine Type | OHV Twin Cylinders | Technical specifications documented across all models |
| Displacement | 40 cu.in. (649 c.c.) | Capacity data for 5T, 6T, T100, T110, TR5, TR6 models |
| Transmission | Four-speed Slickshift | Gearbox component diagrams and assembly procedures included |
| Ignition Systems | Magneto or Coil/Alternator | Two circuit configurations documented |
| Suspension | Telescopic Fork with Swinging Arm | Technical specifications and adjustment procedures included |
Accurately requiring technical understanding of vintage British motorcycle systems, this manual provides foundational documentation for the Triumph twin-cylinder range spanning 1956-1962. The document comprehensively catalogues engine and transmission systems, fuel control mechanisms, electrical architecture, and chassis components. Wiring diagrams are provided for dynamo-equipped models and AC alternator configurations across variant-specific circuit layouts.
Fuel system procedures are documented for both Amal Monobloc and S.U. carburetters, including detailed operational theory and tuning methodology. Adjustment procedures are detailed for tappets, ignition timing across magneto and distributor-equipped variants, and carburation parameters covering pilot jet systems, needle positioning, and throttle valve selection. The manual includes specifications for all six models with particular attention to compression ratios, valve timing figures, and bearing dimensions. Timing procedures are documented with camwheel marking references, gear cluster assembly, and distributor positioning for optimal ignition advance.
Technical notes are provided for crankshaft assembly sequences, connecting rod installation tolerances, and main bearing specifications. The document includes complete lubrication system schematics showing oil pump construction, release valve operation, rocker spindle feed pathways, and scavenge circuit architecture. Electrical diagrams illustrate both traditional dynamo-regulator systems and later AC generation with rectification circuits for 6-volt positive earth configurations. Suspension documentation covers steering head race adjustment, fork cartridge construction, and Girling shock absorber operation across solo and sidecar loading scenarios.
The manual documents torque specifications for cylinder head bolts to ensure proper mechanical assembly and stress distribution. Component specifications span wheel bearings, crankshaft journal diameters, piston ring gaps, and brake system lever ratios. Routine maintenance schedules reference specific service intervals with fluid capacities for engine oil, gearbox, primary chaincase, and fork systems. Technical reference data includes tire pressures for both solo and sidecar configurations, electrical contact point gap settings, and spark plug specifications across all six model variants.
Chain documentation encompasses primary and secondary drive specifications, adjustment procedures with precise vertical play tolerances, and maintenance protocols for both enclosed and exposed configurations. Brake system documentation includes anchor plate geometry, cam spindle specifications, and shoe lining material composition with wear limits. The document's comprehensive component index facilitates rapid reference to transmission, cooling, ignition, and fuel system assemblies with exploded view diagrams for major units.
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