Triumph 650cc Twin Unit Construction Repair Manual (1963-1970)

Triumph 650cc Twin Unit Construction (1963–1970) Workshop Manual

• Covers 1963–1970 Triumph 650cc Twin Unit Construction motorcycles, including T120, TR6, and 6T variants with engine numbers starting from DU.101
• Official Triumph Engineering Co. Ltd. publication, Part No. T989
• Contains 52 technical diagrams, exploded views, and detailed specification tables for engine, transmission, electrical, and chassis components
• Downloads to your account within seconds of checkout
• Your order stays downloadable from your account for life
• Indexed PDF search covers every chapter and appendix
• Full-text search finds any part number in seconds
• This 236-page document provides the complete factory-standard data required for engine rebuilding, ignition timing, and periodic lubrication maintenance

Technical Documentation Scope

The 1963–1970 Triumph 650cc Twin Unit Construction manual documents the full service procedures for these classic British motorcycles. Sections cover the engine lubrication system, transmission, gearbox, frame, and electrical components. The document details dismantling and reassembly workflows for the crankshaft, cylinder head, and primary chaincase, alongside specific instructions for the lubrication oil paths and pressure release valves. Each mechanical assembly section is supported by exploded-view diagrams which facilitate accurate parts identification for the enthusiast or mechanic.

Specification and Reference Data

This manual provides extensive technical data, including torque values, valve clearance settings, and fluid capacities for the T120, TR6, and 6T models. Tappet clearance for the intake is listed at 0.002 in. cold, while the exhaust is set at 0.004 in. cold. Coolant capacity for the 1963–1970 Triumph 650cc Twin is not applicable as this is an air-cooled engine; oil capacity is documented at 6 pints. Ignition timing for the T120 is specified at 38° BTDC at full advance.

Reference only — always consult a certified technician before performing service on this equipment.

An official 236-page Triumph OEM workshop manual covering the 1963–1970 650cc Twin Unit Construction range, documenting engine, chassis, electrical, and transmission specifications for the T120, TR6, and 6T builds.