OMC Stern Drive GM 250 (1964 - 1986)

This OMC marine manual is 456 pages.

QUICK REFERENCE DATA

CHAPTER ONE / GENERAL INFORMATION
Manual organization / Torque specifications / Engine operation / Fasteners / Lubricants / Galvanic corrosion / Protection from galvanic corrosion / Propellers / Specifications

CHAPTER TWO / TOOLS AND TECHNIQUES
Safety first / Basic hand tools / Test equipment / Service hints / Special tips / Mechanicâ??s techniques

CHAPTER THREE / TROUBLESHOOTING
Starting system / Charging system / Ignition system / Engine performance / Engine overheating / Engine oil pressure indicator / Engine oil leaks / Engine noises / Fuel system / Cooling system / Specifications

CHAPTER FOUR / LUBRICATION, MAINTENANCE AND TUNE-UP
Pre-operational checks / Starting check list / Post-operational checks / Cooling system flushing / Engine maintenance and lubrication / Engine oil level check / Engine oil and filter change / Power steering service / Fuel system service / Sediment bowl fuel filter service / Canister-type fuel filter service / Carburetor fuel inlet filter service / Fuel quality / Flame arrestor / Battery / Stern drive lubrication / Lower gear case lubricant level check / Lower gearcase lubricant change / Upper gearcase lubricant level check / Upper gear case lubricant change / Intermediate housing service / Tilt unit gearcase lubricant change / Tilt bearings and tilt gear / Swivel bearing / Steering shaft / Engine tune-up / Valve adjustment / Compression test / Ignition system / Spark plugs / Distributor cap, wires and rotor / Contact breaker point replacement / Breaker point gap adjustment / Ignition timing / Carburetor / Idle speed and mixture adjustment / Specifications

CHAPTER FIVE / LAY-UP, COOLING SYSTEM SERVICE AND FITTING OUT
Lay-up / Cooling system draining / Cooling system refilling / Fitting out / Specifications

CHAPTER SIX / INLINE ENGINES
Replacement parts / Engine removal / Engine installation / Disassembly checklist / Rocker arm cover / Intake and exhaust manifolds / Front cover and seal / Rocker arm assemblies / Camshaft / Oil pan / Oil pump / Cylinder head / Valves and valve seats / Piston/connecting rod assembly / Crankshaft / Flywheel / Cylinder block / Core plugs / Specifications

CHAPTER SEVEN / GM V6 and V8 ENGINES
Replacement parts / Removal / Engine installation / Disassembly checklist / Rocker arm cover / Intake manifold / Exhaust manifolds / Crankshaft pulley and harmonic balancer / Front cover and seal / Timing chain and sprockets / Rocker arm assemblies / Camshaft / Oil pan / Oil pump / Cylinder head / Valves and valve seats / Piston/connecting rod assembly / Crankshaft / Rear main oil seal / Flywheel / Cylinder block / Core plugs / Specifications

CHAPTER EIGHT / FORD V8 ENGINES
Replacement parts / Removal / Engine installation / Disassembly checklist / Rocker arm cover / Intake manifold / Exhaust manifold / Crankshaft pulley and vibration damper / Front cover and seal / Timing chain and sprockets / Rocker arm assemblies / Camshaft / Oil pan / Oil pump / Cylinder head / Valves and valve seats / Piston/connecting rod assembly / Crankshaft / Rear main bearing oil seal / Flywheel / Cylinder block / Core plugs / Specifications

CHAPTER NINE / FUEL SYSTEM
Flame arrestor / Fuel quality / Carburetor fundamentals / Carburetors / Fuel pump and anti-siphon devices / Fuel lines/ Specifications

CHAPTER TEN / COOLING SYSTEM
Thermostat / Hose replacement / Engine circulating pump / Sea water pickup pump (Stern drive unit) / Closed cooling system maintenance / Standard cooling system maintenance / Flushing adapters / Specifications

CHAPTER ELEVEN / ELECTRICAL SYSTEMS
Battery / Charging system / Starting system / Ignition system / Ignition coil / Ignition resistor wire / Switches and connectors / Ignition switch / ESA module switches / Solenoids / Oil pressure sending unit / Water temperature sending unit / Fuses / Specifications

CHAPTER TWELVE / STERN DRIVE REMOVAL, INSTALLATION AND UPPER GEARCASE OVERHAUL
Stern drive / Shift cable (1978-on) / Upper gearcase / Specifications

CHAPTER THIRTEEN / LOWER GEARCASE (1964-1977)
Operation / Service precautions / Lower gearcase / Specifications

CHAPTER FOURTEEN / LOWER GEARCASE (1978-ON)
Operation / Service precautions / Lower gearcase / Specifications

CHAPTER FIFTEEN / IMTERMEDIATE HOUSING AND TILT MECHANISM
Intermediate housing / Tilt mechanism / Specifications

CHAPTER SIXTEEN / SELECTRIM SYSTEM
Operation / Mechanical system / Hydraulic system / Specifications

INDEX

WIRING DIAGRAMS

Models covered:
1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 OMC Ford 90
1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 OMC Ford 302
1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 OMC Ford 351W
1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 OMC GM 2.5L
1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 OMC GM 3.0L
1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 OMC GM 225
1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 OMC GM 229
1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 OMC GM 250
1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 OMC GM 262

Clymer Manuals OMC Ford 90 Manual
Clymer Manuals OMC Ford 302 Manual
Clymer Manuals OMC Ford 351W Manual
Clymer Manuals OMC GM 2.5L Manual
Clymer Manuals OMC GM 3.0L Manual
Clymer Manuals OMC GM 225 Manual
Clymer Manuals OMC GM 229 Manual
Clymer Manuals OMC GM 250 Manual
Clymer Manuals OMC GM 262 Manual

OMC Ford 90 (1964-1986)
OMC Ford 302 (1964-1986)
OMC Ford 351W (1964-1986)
OMC GM 2.5L (1964-1986)
OMC GM 3.0L (1964-1986)
OMC GM 225 (1964-1986)
OMC GM 229 (1964-1986)
OMC GM 250 (1964-1986)
OMC GM 262 (1964-1986)