2002–2004 Triumph Sprint ST / Sprint RS Service Manual (P/N 3851620)

This Triumph Service Manual, P/N 3851620 (Issue 1, October 2001), covers the 2002–2004 Sprint ST and Sprint RS. Its 16 numbered sections cover maintenance, engine and transmission repair, fuel-system diagnosis, chassis service, and electrical systems.

PDF Search, Page Order, and Diagram Detail

Navigation and small labels: PDF text search and embedded bookmarks are unavailable. The fuel-system section is partly out of printed page order. Small circuit-diagram labels require zooming; some dense labels in the two full-color overall wiring diagrams remain blurred when enlarged.

Supplied as one printable, 381-page English PDF: 374 pages across the numbered sections, plus the front cover, publication page, contents page, two introduction pages, one blank page, and back cover—all included in the total.

Engine Rebuilds, EFI Diagnosis, and Chassis Service

These selected workshop topics illustrate the manual’s coverage. Other included material ranges from the Scheduled Maintenance Chart to model-specific fairing removal.

• Engine repair: Step-by-step engine removal, cylinder-head service, silent-type cam-chain timing, balancer alignment, and crankshaft, connecting-rod, piston, and cylinder-liner inspection.

• Clutch and transmission: Wet-clutch disassembly, friction-plate inspection, input/output shaft rebuilding, selector-mechanism service, and starter sprag-clutch inspection.

• Fuel and engine management: Throttle-body balancing, fuel-pressure testing, injector service, diagnostic trouble codes, freeze-frame data, and component pinpoint tests.

• Cooling and lubrication: Coolant replacement, thermostat testing, water-pump inspection, oil-pump clearance checks, and oil-cooler removal and installation.

• Suspension and final drive: Fork disassembly, seal replacement, steering-bearing adjustment, rear-linkage service, and separate ST/RS swingarm and chain procedures.

• Brakes and wheels: Hydraulic bleeding, caliper and master-cylinder service, disc inspection, and model-specific rear-wheel removal and installation.

• Electrical systems: Alternator and starter removal, relay identification, instrument-pack service, and separate engine-management, lighting, starting/charging, and auxiliary circuit diagrams.

Written primarily for trained technicians in a properly equipped workshop, the manual also supports owners performing basic maintenance and repair who have mechanical knowledge and the necessary hand and special service tools.

Engine Inspection and Assembly References

Valve work includes shim-under-bucket adjustment and a Typical Valve Clearance Chart for recording individual measurements. Internal-engine procedures pair Plastigauge checks with Big End Bearing Selection and Main Bearing Selection charts.

Piston Ring Identification views and Crankcase Bolt Tightening Sequence drawings support reassembly. The component-specific measurements and inspection limits help a workshop assess component reuse and bearing selection during an engine rebuild.

Repair limits: Valve seats and guides are not separately replaceable, and worn guides require cylinder-head replacement. Cylinder-head installation includes liner resealing. The crankshaft inspection instructions rule out regrinding and oversize bearings.

Assembly cautions: Incorrect camshaft alignment can cause valve contact and damage the cylinder head. The connecting-rod section warns that tightening in one action can stretch a bolt and leave its nut loose in service, risking engine failure.

Special-tool references identify the alternator rotor holder T3880375 and angular torque gauge T3880105, alongside illustrations showing their applications.

EFI Fault Tracing and Diagnostic-Tool Requirements

DTC tables and pinpoint tests connect sensor and actuator faults with ECM Connector Pin Numbering views. Freeze-frame data captures operating conditions when a fault is logged; function tests cover components such as the fuel pump, cooling fan, idle air control valve, and instruments.

These workflows use Triumph’s dedicated diagnostic tool T3880250. Adjustment procedures include closed-throttle and adaptive-stepper resets. Tune updates require Triumph instructions and a password, rather than providing unrestricted remapping guidance.

Throttle-body balancing is documented with a vacuum analyzer. Secondary air injection is addressed where fitted; evaporative-emissions diagrams and purge-valve testing apply to California models.

ST/RS Chassis Differences and Circuit References

The rear-suspension chapter separates swingarm, drop-link, hub, and final-drive procedures by model. It distinguishes the ST’s eccentric chain adjuster from the RS’s paired adjusters.

Brake coverage extends to caliper piston/seal work and master-cylinder disassembly. Lighting, Starting/Charging, and Auxiliary Circuit Diagrams are provided separately for each model, with component keys and wire-color codes.

Brake and fuel-system work involves safety-critical components; consult a qualified technician if you are uncertain of a procedure.

A Preview of Valve Clearances and Coil Test Data

For the cold-engine valve-clearance check, both models have an intake specification of 0.10–0.20 mm and an exhaust specification of 0.20–0.30 mm. The accompanying shim-selection instructions explain the adjustment method.

The ignition specifications list pickup-coil resistance as 0.56 kΩ ±10% at 20°C, retaining the tolerance and test temperature needed to interpret a resistance measurement.