1996 Sea-Doo GSX 5620 / GTX 5640 Service Manual (P/N 219 100 034)

• 355-page PDF manual set - GSX/GTX Shop Manual Supplement P/N 219 100 034: 39 pages; base 1996 Bombardier Watercraft Shop Manual P/N 219 100 031: 316 pages.
• Exact model coverage is 1996 Sea-Doo GSX 5620 and GTX 5640 with the Rotax 787 engine. The supplement identifies model-specific differences; the base manual supplies the shared repair procedures it does not repeat.
• Engine material covers removal, installation and pump alignment; 787 top- and bottom-end disassembly, inspection and assembly; squish inspection; RAVE service; crankshaft checks; rotary-valve timing; and tuned-pipe, manifold and muffler work.
• Fuel and lubrication sections detail twin Mikuni BN-40I-38 carburetor removal, diaphragm-pump and pop-off/leak testing, synchronization and adjustment, fuel-system pressure testing, and VROI oil-pump adjustment, bleeding and operation checks.
• Electrical coverage includes 787 DC-CDI ignition timing and component tests, charging and starting diagnosis, starter overhaul, DESS self-diagnostics, and GSX/GTX Info Center gauge and sensor checks.
• Propulsion, steering and body procedures address plastic Formula Pump inspection and overhaul, drive-system work, GSX VTS service, GTX reverse-system repair and cable adjustment, steering alignment, ride-plate and pump-support installation, and seat and storage-cover adjustment.
• Separate GSX and GTX wiring diagrams are supplied as full two-page schematics, supported by exploded views and circuit drawings for the engine, cooling, reverse, steering and jet-pump systems.

Using the GSX/GTX Supplement with the Base Manual

This two-PDF set pairs Bombardier's model-specific supplement with the base publication it names as the required reference. The supplement covers the main differences introduced on the GSX 5620 and GTX 5640; when a system is not discussed there, it directs the technician to P/N 219 100 031. The supplement is not a stand-alone engine overhaul manual. The included base manual contains the common 787 engine, fuel, cooling, lubrication, electrical and propulsion procedures needed to complete the coverage.

Bombardier states that the material was primarily published for manufacturer-trained watercraft technicians already familiar with Sea-Doo service and maintenance procedures and equipped with the specified hand and special tools. Major engine, fuel, electrical and jet-pump repair should therefore be performed or verified by a highly skilled marine technician. Coverage reflects the watercraft as manufactured and does not extend to later dealer modifications.

GSX and GTX Model-Specific Detail

The supplement's electrical chapter covers the exterior- and lake-temperature sensors, speed sensor, compass, fuel-baffle pickup, tachometer, speedometer and Info Center gauge. Wire functions and test tables support fuel-level, VTS-position and temperature-display diagnosis.

For the GTX, the reverse chapter documents deflector, cable-lever, pawl-lock, spring, support and shift-lever service, followed by cable adjustment and an operational check. The shared steering chapter covers handlebar and steering-support removal, throttle/choke cable and harness handling, stem-arm assembly, model-specific nozzle ball-joint installation and straight-ahead alignment. Hull/body information adds seat and storage-cover lock-pin settings, inlet-grate and riding-plate removal, jet-pump support and shoe work, sealing locations, and tightening sequences.

The model tables make the hardware split clear. GSX uses VTS and an aluminum steering nozzle but has no reverse system; GTX uses the reverse system and a plastic steering nozzle but has no VTS. The speedometer is optional on GSX and standard on GTX. This distinction keeps a technician from selecting the wrong adjustment or component layout.

Factory References and Repair Cautions

Visual references include the 787 top-end and bottom-end exploded views, the 787 cooling-system circuit, the GTX reverse-system parts view, the GSX/GTX steering assembly, and the separate wire-labeled GSX and GTX schematics. Specification tables cover component-specific engine, pump, steering and electrical tightening torques, along with carburetor settings, ignition and resistance test data, capacities, clearances and wear limits.

Factory tool callouts identify the 787 ring-gear blocking tool P/N 295 000 134, 787 timing-mark pointer P/N 295 000 135, 787 engine distance gauge P/N 290 876 828, MPEM programmer P/N 295 000 127, and engine/pump alignment support and shaft P/Ns 295 000 090 and 295 000 093. Repair cautions warn that distorted or reused piston-pin circlips can come loose and damage the engine, while excessive heat during crankshaft-bearing installation can melt the bearing's plastic cage.