1957–1974 Triumph Tiger 100, Tiger 90, Speed Twin & 3TA Daytona, T100, T100S, T100T, T100C, T100R, T90, 5TA, 3TA Workshop Manual OEM

• Covers 1957–1974 Triumph 350cc and 500cc unit-construction twins, including the Tiger 100, Tiger 90, 5TA, 3TA, and Daytona variants.
• Complete 251-page original OEM publication (P/N 305), featuring engine number H65573 build-state specifications.
• Contains 40 exploded-view assembly diagrams and comprehensive torque tables covering every major fastener from cylinder head nuts to crankshaft flywheel bolts.
• Provides the 1969 technical standard for unit twins, featuring critical adjustments for the later T100S, T100T, T100C, and T100R configurations.
• Details complete service procedures for the primary chaincase, four-speed gearbox, shock-absorbing clutch, telescopic forks, swinging forks, twin leading shoe brakes, contact breaker, and Amal Monobloc carburetors.
• Features expert step-by-step instructions for crankcase parting, crankshaft dynamic balancing, stroboscopic ignition timing, valve seat recutting, carburetor synchronization, alternator stator replacement, and oil pump rebuilding.

Engine and Lubrication Walkthrough

Let’s dive into the core of the unit-construction architecture shared across the vintage Triumph twin-cylinder range. This factory reference is a mandatory addition to your workbench. Having this PDF on hand allows you to verify crucial tolerances directly during a repair, preventing costly assembly errors when splitting the cases or overhauling the transmission. The manual breaks down the dry-sump setup, oil pump pressure regulation, and routine maintenance intervals for the engine, gearbox, and primary chaincase.

Need to pull the head? Detailed sections guide you through the safe removal and assembly of the engine unit, rocker boxes, and cylinder head. It also clearly outlines valve timing and carburetor setups for both single and twin-carburetor arrangements. This provides the exact factory sequences needed for comprehensive troubleshooting, allowing DIYers and mechanics to confidently tackle advanced tear-downs without outsourcing to an expensive specialist.

Specification and Data Reference

Reliable data is everything when dealing with classic British iron. This document delivers structured tables packed with exact specifications. You will find piston clearances, valve seat angles, and timing gear alignment specs broken down by specific model years and serial-number ranges. Crankshaft assembly notes detail the exact balance weights and oil tube servicing requirements these engines demand.

Visual aids extensively streamline the rebuilding process; alongside the exploded views, the text features an engine lubrication diagram, an exploded view of the engine gearbox unit, a cylinder head bolt tightening sequence chart, a sectional view of the crankshaft, and a timing cover oil seal location drawing. Additional documentation includes reference values for head race ball bearings, telescopic fork oil capacities, and wiring schematics for Lucas 12-volt equipment. Before putting a wrench to these vintage machines, always ensure you are familiar with standard shop safety practices and consult a certified technician if you are ever unsure about structural or engine-critical tolerances. This official Triumph workshop manual gives you the authoritative specs you need to keep your unit twin running strong.