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Mercury 3 - 275 HP Outboards, 1990-1993 Part #: B722
640 pages
CHAPTER ONE / GENERAL INFORMATION Manual organization / Notes, cautions and warnings / Torque specifications / Engine operation / Fasteners / Lubricants / Gasket sealant / Galvanic corrosion / Protection from Galvanic corrosion / Propeller
CHAPTER TWO / TOOLS AND TECHNIQUES Safety first / Basic hand tools / Test equipment / Service hints / Special tips / Mechanic's techniques
CHAPTER THREE / TROUBLESHOOTING Operating requirements / Starting system / Charging system / Ignition system / Breaker-point ignition troubleshooting (1990-1992 3 hp models) / Capacitor discharge ignition (CDI) / Direct voltage tests / Resistance test / Speed limiter / Spark advance/idle stabilizer module troubleshooting / Fuel system / Engine
CHAPTER FOUR / LUBRICATION, MAINTENANCE AND TUNE-UP Lubrication / Storage / Anti-corrosion maintenance / Complete submersion / Flushing the cooling system / Tune-up
CHAPTER FIVE / TIMING, SYNCHRONIZING AND ADJUSTING Ignition timing and synchronization / 3 hp models / 3 and 5 hp models / 8, 9.9 and 15 hp models / 20 and 25 hp models / 40 hp models / 50 and 60 hp models (prior to serial No. D000750) / 50 and 60 hp models (serial No. D000750-on) / 75 and 90 hp models / 100 and 115 hp models / 135-200 hp (except EFI) models / 250 and 275 hp models / 150Xri, 175Xri and 200Xri (EFI) models
CHAPTER SIX / FUEL SYSTEM Fuel pump / Carburetors / Throttle plunger carburetor (3 and 3.3 hp models) / Integral fuel pump carburetor (4 and 5 hp models) / Integral fuel pump carburetor (8-25 hp models) / WMA carburetor (40 hp models) / MerCarb center bowl carburetor (50 and 50 hp models prior to serial No. D000750) / WME carburetor (50 and 60 hp serial No. D000750-on, 75, 90, 100 and 115 hp models) / WMH carburetor (135-200 hp models) / MerCarb center bowl carburetor (250 and 275 hp models) / Thermal air valve (135-200 hp models) / Enrichment valve and choke solenoid systems / Anti-siphon devices / Fuel filter / Fuel tank / Fuel hose and primer bulb / Electronic fuel injection (EFI) / Fuel management tests
CHAPTER SEVEN / IGNITION AND ELECTRICAL SYSTEMS Battery / Battery charging system / Starting system / Magneto breaker point ignition / Capacitor discharge ignition (CDI) (1993 3.3 hp models) / Capacitor discharge ignition (CDI) (4-275 hp models)
CHAPTER EIGHT / POWER HEAD Engine serial number / Gaskets and sealants / Fasteners and torque / Power head
CHAPTER NINE / LOWER UNIT GEAR HOUSING Service precautions / Gear housing / Water pump / Bearing carrier and propeller shaft / Pinion gear, drive shaft and forward gear / Lower shift shaft, bushing and cam / Pinion depth/gear backlash / Propeller / Trim tab adjustment
CHAPTER TEN / POWER TRIM AND TILT SYSTEM Manual tilt assist system / One-ram integral power trim system (40-60 hp models) / Three-ram integral power trim system (75-200 hp models) / One-ram oildyne power trim system (250-275 hp models) / Power trim assembly removal/installation / Power trim motor and pump assembly removal/installation
CHAPTER ELEVEN / OIL INJECTION SYSTEM Autoblend II (50 and 60 hp prior to serial No. D000750) / Constant ratio oil injection (40 hp and 50-60 [serial No. D000750-on] hp models) / Injection system service / Variable-ratio oil injection (75-115 hp models) / Warning horn system / Injection system service / Variable-ratio oil injection (V6 models) / Warning hose system / Injection system service
CHAPTER TWELVE / MANUAL REWIND STARTERS 3 and 3.3 hp models / 4 and 5 hp models / 8, 9.9, 15, 20 and 25 hp models / 40 hp models
INDEX
WIRING DIAGRAMS
Models covered: 1990 1991 1992 1993 MERCURY 100 HP 1990 1991 1992 1993 MERCURY 115 HP 1990 1991 1992 1993 MERCURY 135 HP 1990 1991 1992 1993 MERCURY 15 HP 1990 1991 1992 1993 MERCURY 150 HP 1990 1991 1992 1993 MERCURY 150XR4 1990 1991 1992 1993 MERCURY 150XR6 1990 1991 1992 1993 MERCURY 150XRi 1990 1991 1992 1993 MERCURY 175 HP 1990 1991 1992 1993 MERCURY 175XRi 1990 1991 1992 1993 MERCURY 20 HP 1990 1991 1992 1993 MERCURY 200 HP 1990 1991 1992 1993 MERCURY 200XRi 1990 1991 1992 1993 MERCURY 25 HP 1990 1991 1992 1993 MERCURY 250 HP 1990 1991 1992 1993 MERCURY 275 HP 1990 1991 1992 1993 MERCURY 3 HP 1990 1991 1992 1993 MERCURY 3.3 HP 1990 1991 1992 1993 MERCURY 4 HP 1990 1991 1992 1993 MERCURY 40 HP 1990 1991 1992 1993 MERCURY 5 HP 1990 1991 1992 1993 MERCURY 50 HP 1990 1991 1992 1993 MERCURY 60 HP 1990 1991 1992 1993 MERCURY 75 HP 1990 1991 1992 1993 MERCURY 8 HP 1990 1991 1992 1993 MERCURY 9.9 HP 1990 1991 1992 1993 MERCURY 90 HP
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