Triumph Bonneville T140E/T140V & Tiger TR7V 1973–1978 Workshop Manual Set (P/N 99–0983)

Use the workshop manual for mechanical service and contact-breaker electrical systems, and the separate guide for the later electronic ignition and three-phase charging system.

The 1979 guide’s coverage is limited to ignition and charging-system description, diagnosis, testing, and wiring.

Printable PDF, Bookmarks and Wiring Detail

Section access and diagram detail: Manual text is not searchable. Embedded bookmarks link to the main workshop sections; the 1979 guide has no dedicated bookmark. Small labels in the main wiring diagrams require zooming. Some labels and lines on the 1979 wiring page remain faint or incomplete when enlarged.

The set contains 217 pages in one printable PDF, including four supplementary pages within the workshop-manual portion. The electrical guide appears between the workshop manual’s electrical section and its service-tool section.

Engine Rebuilds, Amal Service and Electrical Fault Finding

These selected contents outline the main repair areas. Other topics include control-cable replacement and workshop conversion charts.

• Engine repair: Engine removal, cylinder-head and valve service, piston and bore inspection, crankshaft servicing, main-bearing replacement, and camshaft-bush renewal.

• Lubrication diagnosis: Double-plunger oil-pump inspection, pressure-release valve service, oil-pressure checks, and wet-sumping diagnosis with a scavenge suction test.

• Amal carburetors: Mk I and Mk II removal, disassembly, component inspection, mixture adjustment, and twin-carburetor synchronization.

• Primary drive and gearbox: Clutch inspection, shock-absorber rubber replacement, sprocket alignment, internal gearbox overhaul, and kickstart and selector-mechanism service.

• Brakes and wheels: Hydraulic bleeding, front master-cylinder and caliper service, brake fault-finding tables, early rear drum-brake procedures, and wheel-bearing replacement.

• Forks and chassis: Step-by-step fork overhaul, steering-head bearing replacement, swingarm-bush renewal, suspension-unit identification, and frame inspection.

• Electrical testing: Contact-breaker ignition diagnosis, charging-system tests, wiring diagrams, and separate electronic-ignition and alternator troubleshooting for the later T140E system.

Written for workshop fitters, technical staff, and owners undertaking basic maintenance and repair; the overhaul sections call for measuring equipment and dedicated service tools.

Engine Inspection and Dry-Sump Lubrication

The engine chapter has 40 subsections covering the Meriden-built unit-construction twin. Cylinder and piston grading tables, suitable rebore sizes, and connecting-rod bearing data support decisions about which worn parts can be reused or require replacement.

The engine lubrication diagram and tappet oil-feed drillway views explain the oil paths. Crankshaft servicing includes the removable oil/sludge tube, while the wet-sumping section distinguishes pump check-valve faults from scavenge leaks and return-system restrictions.

The cylinder-head bolt tightening-sequence drawing supports reassembly. Routine maintenance schedules organize oil changes, ignition checks, chain adjustment, and other service tasks by mileage.

Secure the motorcycle on a stable support for engine removal; the manual calls for a second operator or small hoist.

Amal Mk I and Mk II Carburetors

Separate exploded views distinguish the Mk I carburetors used on T140V and TR7V models from the T140E’s Mk II arrangement. The text addresses the Tiger’s single carburetor and the Bonneville’s twin setup, including synchronization and the T140E cold-start enrichment mechanism.

Static and stroboscopic ignition-timing procedures accompany the contact-breaker service instructions.

Clutch, Primary Drive and Gear Selection

Internal gearbox layouts and gear-selection illustrations show the relationships between the mainshaft, layshaft, selector forks, and camplate. Inspection guidance covers shaft wear, gear dogs, bearings, and selector tracks; quadrant-locator tool 61-7011 is illustrated.

The sprocket-alignment section warns that misalignment can break the primary chain and damage the crankcase.

Brake and Suspension Variations

Brake coverage distinguishes the early rear drum arrangement from hydraulic disc-brake versions. The front master cylinder has internal service instructions; the rear master cylinder is serviced as a complete sealed unit.

Girling suspension coverage distinguishes oil-hydraulic and gas-filled rear dampers. The manual warns that incorrect installation orientation can permanently damage the damping mechanism.

Fork service includes damper and seal details, with tool 61-6113 illustrated. Swingarm service uses bush remover and replacer 61-6117.

Contact-Breaker and Electronic-Ignition Tests

The workshop electrical section provides low- and high-tension ignition checks, rectifier bench tests, alternator-output tests, and Zener-diode testing. Circuit diagrams connect the test procedures to the ignition and lighting wiring.

The 1979 guide addresses the RM24 alternator, 3DS5 rectifier, AB11 amplifier, 5PU pickup and reluctor, and 17M6 ignition coils. Its symptom-based tests distinguish charging faults, missing sparks, and amplifier or pickup problems. Wiring includes a lights-on-with-ignition arrangement for California and Canada.

A Preview of Electronic-Ignition Test Data

For the 1979 T140E system, the guide lists a primary-winding resistance of 1.7–1.9 ohms for the 17M6 ignition coils.

The pickup-winding test specifies 650–750 ohms for the 5PU assembly, alongside the amplifier-switching checks used to separate pickup faults from amplifier faults.