1969–1973 Triumph Trident T150/T150V Service Manual (P/N 99–0963)

This Triumph Engineering Co Ltd workshop manual covers the 1969–1973 Trident T150 series, including T150V, T150R, and T150RV variants, from engine number T150T101. P/N 99-0963 incorporates publication 99-0887 and the 1973 supplement 00-4223.

Text search, bookmarks, and wiring detail: The manual text is not searchable. Embedded bookmarks provide access to the main sections and selected procedures. Small wiring labels require zooming, particularly in the fainter supplementary wiring diagram.

• Engine repair: Engine removal, cylinder head disassembly, valve seat re-cutting, crankcase separation, crankshaft inspection, and main bearing renewal.

• Carburetion and ignition: Amal 626 Concentric carburetor overhaul and synchronization, contact breaker adjustment, and static and stroboscopic ignition timing.

• Clutch and gearboxes: Diaphragm spring clutch service, primary chain alignment, and separate four-speed and five-speed gearbox disassembly, inspection, and reassembly procedures.

• Lubrication and maintenance: Routine service schedules, oil pump and pressure release valve service, oil cooler removal, and oil pressure troubleshooting.

• Brake systems: Twin leading shoe drum brakes and Lockheed front disc brakes, including master cylinder and caliper service, hydraulic bleeding, and hose replacement.

• Chassis and suspension: Wheel bearing replacement, frame alignment, swinging fork service, and repair procedures for the different oil-damped telescopic fork designs.

• Electrical diagnosis: Lucas RM20/21 charging equipment, ignition coil tests, rectifier and Zener diode checks, and main and supplementary wiring diagrams.

Written for workshop fitters, technical staff, and owners performing basic maintenance and repair, this manual also covers overhaul work requiring the measuring equipment and service tools identified in the procedures.

Engine Repair and Oil System Checks

Reference tables cover piston and valve-guide clearances, camshaft journals, crankshaft inspection limits, fastener torques, oil pressures, and seasonal lubricant recommendations. The cylinder head bolt tightening sequence and valve timing marks accompany the engine procedures.

Valve-guide replacement identifies service tool 61-6063; tappet guide block replacement is assigned to a Triumph dealer. The cylinder removal section warns that scratches on the alloy connecting rods can initiate fatigue failure.

The engine lubrication flow diagram and exploded oil pump drawing accompany checks for restricted filters, pressure release valve faults, pump wear, and internal oil leakage.

Carburetor Setup and Ignition Variants

The exploded Amal carburetor view identifies the float, needle jet, throttle rod, and slide arrangement used in the overhaul procedures. The synchronization section addresses the shared throttle linkage.

Identification notes explain engine and frame numbering and the later date prefixes. The crankshaft change from PG01603 is linked to different A/B rotor timing marks, helping you select the applicable timing reference before adjustment.

Primary Drive and Gearbox Repair

Primary chain alignment accounts for shock absorber end float and early versus later sprocket designs, with alignment gauge 61-6105 specified. An exploded clutch drawing shows the diaphragm spring and friction components.

Clutch diagnosis explains how insufficient release clearance can cause continued slip and burn out the friction plate. The five-speed gearbox section distinguishes selector forks and requires the high gear and its roller bearing to be replaced together when worn.

Brakes, Forks, and Rear Suspension

Disc brake coverage extends to master cylinder operation, piston seals, and disc runout checks. Caliper servicing is described without separating the caliper halves.

Fork sections distinguish the earlier external-spring design with bronze bushes from the later internal-spring design. The Girling rear suspension section covers springs, bushes, and damper checks; the hydraulic damper units are sealed.

Ignition and Charging Fault Tracing

Point-to-point low-tension circuit tests help separate wiring faults from coil, capacitor, and spark plug problems. The electrical section also includes rectifier bench tests and the Lucas 2MC capacitor ignition circuit for operation with or without a battery.

Always review standard shop safety protocols before handling heavy engine components or electrical systems to prevent injury.

A Preview of Valve, Timing, and Coil Test Specifications

These are a few of the adjustment and electrical test values included in the manual.

The T150 valve-clearance procedure specifies 0.006 in. for the intake and 0.008 in. for the exhaust with the engine cold. The ignition data specifies 38° BTDC at full advance.

For the Lucas 17M12 ignition coil, the primary winding resistance specification is 3.3–3.8 ohms at 20°C.

Printable PDF and Included Pages

One printable English-language PDF contains 249 pages: 237 pages of manual and supplement material, including covers and contents, plus one photo page, one General Data divider, and 10 blank separator pages. The supplements and all additional pages are already included in that total.