2000–2005 Mercury MerCruiser Bravo Sterndrive Service Manual (P/N 90-863160-1)

This 688-page PDF contains Mercury Marine Service Manual No. 28, manual/revision identifier 90-863160--1, issued in June 2003. Coverage is defined by serial number rather than a model-year span: all Bravo models serial 0M100000 and above and Sport Master models serial 0M052945 and above. The drive sections distinguish Bravo One, Bravo Two, Bravo Three, Bravo X/XZ/XR, Diesel Bravo One X/Two X/Three X, and Super SportMaster components. Mercury Marine wrote the manual for dealer mechanics and company service personnel already familiar with these or comparable products and trained in the recommended procedures, so this is technician-level material that assumes marine-shop skills and access to the specified tools.

• Drive and gearcase repair: Covers sterndrive removal and installation, drive-shaft-housing and gearcase separation, clutch and shifter repair, U-joint and pinion service, bearing and gear inspection, propeller-shaft and bearing-carrier work, shimming, backlash checks, and reassembly for the model-specific Bravo One, Two, and Three housings.

• Transom assembly work: Details minor and major disassembly of standard and high-performance assemblies, including gimbal-bearing service, bell-housing removal, gimbal-ring and swivel-shaft repair, shift-cable and bellows replacement, trim-position-sender and trim-limit-switch wiring, gear-lube-monitor components, and the access-plug drilling template.

• Power trim diagnosis and repair: Includes the Oildyne pump, trim cylinders, and dual power-trim controls, with bleeding, pressure and internal-leak tests, motor bench tests, armature and field checks, solenoid and fuse diagnosis, relief-valve service, and relay/diode testing.

• Steering-system procedures: Addresses steering helm and cable installation, power-steering assembly and pump service, flow-control-valve work, pressure testing, filling and bleeding, compact hydraulic steering, single- and twin-station purging, and multiple-drive tie-bar arrangements.

• Maintenance and corrosion protection: Covers water-pickup flushing, layup and recommissioning, anodes, continuity circuits, Integral MerCathode systems, galvanic isolators, hull-potential testing, and symptom-based corrosion troubleshooting.

• Named diagrams and views: Includes the Drive Shaft Housing exploded view for the complete housing, Super SportMaster Gear Housing and Drive Shaft Components view, Bravo Transom Assembly exploded views, Power Trim Hydraulic Schematic, Dual Trim Harness Control Module wiring diagram, and MerCathode Controller wiring diagrams for standard and quick-connect systems.

Variant Identification and Factory Data

Ratio-identification material includes U-joint shaft markings, gear tooth-count tables, gear-ratio markings, and ratio-specific serial starts for Permalube non-regreasable U-joints. Separate notes cover the Bravo Three trim-in limit insert, dual-water-pickup gearcases, and early versus later Oildyne pump construction. These distinctions help match the unit and hardware before parts are ordered or a repair procedure is selected.

The maintenance section provides the specified 10-hour break-in period for new units or replacement gears, service schedules, sterndrive oil checking and changing, and fluid and lubricant requirements. Factory data spans component-specific torque tables, bearing preloads, backlash and end-play checks, pinion-clearance and shimming data, hydraulic pressure tests, electrical specifications, fluid capacities, approved lubricants, and corrosion-test readings.

Special-tool information is equally specific. Examples include the Shift Cable Adjustment Tool 91-12427, Drive Shaft Pinion Gear Shimming Tool 91-42840T, Trim Pump Test Gauge Kit 91-52915A6, Power Steering Test Gauge Kit 91-38053A4, and Reference Electrode 91-76675T1 for MerCathode hull-potential checks.

Repair Cautions and Scope

During drive-shaft-housing assembly, the clutch gears must be correctly timed to the housing index marks; incorrect timing can damage the gears and U-joint pinion gear. The trim-pump test section also warns that cross-connecting the IN/DOWN and OUT/UP hoses can damage the sterndrive housing.

This volume is centered on the drive, transom, trim, steering, and corrosion systems. Internal engine service is outside its repair scope; when engine removal or installation is required for transom work, the manual directs the reader to the applicable Mercury MerCruiser engine service manual. The safety material calls for battery disconnection whenever electrical terminals could be grounded or touched, and its component-specific warnings should be followed during drive, hydraulic, steering, and electrical service.