Description
This USED Clymer Yamaha 1989 1990 1991 Stern Drive Repair Manual provides detailed service information, step-by-step repair instruction and maintenance specifications for 1989-1991 Yamaha stern drive boat engines.
1989 Yamaha V6 4.3 YEMS
1989 Yamaha V8 5.0 & 5.7 YEMS
1990 – 1991 L4 3.0 EST
1990 – 1991 V6 4.3 EST
1990 – 1991 V6 4.3 YEMS
1990 – 1991 Yamaha V8 5.0 & 5.7 EST
1990 – 1991 Yamaha V8 5.0 & 5.7 YEMS
This manual includes general information on each model, tools and techniques, troubleshooting, lubrication, maintenance and tune-up, storage, cooling system service, inline engines, GM V6 and V8 marine engines, fuel system, cooling system, electrical system, stern drive, upper gear housing, gearcase housing – lower unit, transom assembly, power trim and tilt systems, steering system and complete wiring diagrams. Features 448 illustrated pages.
Table of Contents
QUICK REFERENCE DATA
CHAPTER ONE – GENERAL INFORMATION
Manual organization – Notes, cautions and warnings – Torque specifications – Engine operation – Fasteners – Lubricants – Gasket sealant – Galvanic corrosion – Protection from galvanic corrosion – Propellers
CHAPTER TWO – TOOLS AND TECHNIQUES
Safety first – Basic hand tools – Test equipment – Service hints – Special tips – Mechanic’s techniques
CHAPTER THREE – TROUBLESHOOTING
Starting system – Charging system – Charging system troubleshooting – Ignition system – Fuel system – Engine performance – Engine overheating – Engine oil pressure indicator – Engine oil leaks – Engine noises – Engine troubleshooting – Cooling system – Positive crankcase ventilation system – Exhaust leakage – Remote control
CHAPTER FOUR – LUBRICATION, MAINTENANCE AND TUNE-UP
Pre-operational checks – Starting checklist – Post-operational checks – Cooling system flushing – Engine maintenance and lubrication – Stern drive lubrication and maintenance – Engine tune-up – Compression check – Ignition system – Carburetor
CHAPTER FIVE – LAY-UP, COOLING SYSTEM AND FITTING OUT
Lay-up – Cooling system draining – Cooling system refilling – Fitting out – Engine submersion
CHAPTER SIX – INLINE ENGINE
Engine serial number – Engine rotation – Special tools – Gasket sealant – Replacement parts – Engine removal – Engine mount – Engine installation – Engine alignment – Disassembly checklists – Valve cover – Intake and exhaust manifold assembly – Rocker arms – Crankshaft pulley and harmonic balancer – Crankcase front cover and oil seal – Camshaft – Timing gear replacement – Oil pan – Oil pump – Cylinder head – Valves and valve seats – Valve lifters/lash adjusters – Piston/connecting rod assembly – Rear crankshaft oil seal and retainer – Crankshaft end play measurement – Flywheel – Cylinder block – Core plug replacement
CHAPTER SEVEN – GM V6 AND V8 ENGINES
Engine serial number – Engine rotation – Special tools – Gasket sealant – Replacement parts – Engine removal – Engine mount – Engine installation – Engine alignment – Disassembly checklists – Valve covers – Intake manifold – Exhaust manifold and elbow – Rocker arms – Crankshaft pulley and harmonic balancer – Crankcase front cover and oil seal – Timing chain and sprockets – Camshaft – Valve lifters – Oil pan – Oil pump – Cylinder head – Valves and valve seats – Piston/connecting rod assembly – Rear main bearing oil seal – Crankshaft – Flywheel – Cylinder block – Core plug replacement
CHAPTER EIGHT – FUEL DELIVERY SYSTEM
Flame arrestor – Fuel requirements and quality – Carburetor fundamentals – Carburetors – Fuel pump and anti-siphon devices – Fuel lines
CHAPTER NINE – COOLING SYSTEM
Thermostat – Hose replacement – Engine circulating pump – Seawater pump (inline engine) – Seawater pump (V6 and V8) – Power steering oil cooler (V6 and V8) – Closed cooling system maintenance – Standard cooling system maintenance – Drive belts
CHAPTER TEN – ELECTRICAL SYSTEMS
Battery – Charging system – Starting system – Ignition system – Ignition coils – Switches and connectors – Ignition switch – Shift interruption switch – Relays – Oil pressure gauge and sending unit – Oil pressure switch – Water temperature sending unit – Water temperature switch – Seawater flow switch (YEMS models) – Electrical protection
CHAPTER ELEVEN – STERN DRIVE AND UPPER GEAR HOUSING
Service precautions – Stern drive service – Upper gear housing assembly
CHAPTER TWELVE – GEARCASE HOUSING (LOWER UNIT)
Service precautions – Lower gearcase housing assembly – Propeller
CHAPTER THIRTEEN – TRANSOM ASSEMBLY
Transom shift cable – Pivot housing – Gimbal ring – Gimbal bearing and seal replacement – Gimbal housing and transom plate – Exhaust collector – Shift cable adjustment
CHAPTER FOURTEEN – POWER TRIM AND TILT SYSTEM
Trim cylinders
CHAPTER FIFTEEN – STEERING SYSTEMS
Safety precautions – Mechanical steering system – Power steering system
INDEX
WIRING DIAGRAMS
