1956-1970 Johnson Evinrude 1.5 HP-40 Hp Service Repair Workshop Manual

1956-1970 Johnson Evinrude 1.5 HP-40 HP Service Repair Workshop Manual PDF VEHICLE/EQUIPMENT INTRODUCTION: The Johnson and Evinrude outboard motors produced between 1956 and 1970 represent the golden age of American marine engineering. During this era, these two sister brands -- operating under the Outboard Marine Corporation -- dominated the global outboard market with their innovative two-stroke engine designs. This manual covers the complete lineup from the smallest 1.5 HP light-duty trolling motor through the robust 40 HP models that powered runabouts, fishing boats, and small cruisers. The range includes single-cylinder through multi-cylinder engines, with displacements growing progressively through the horsepower ratings. These outboards introduced many innovations including the first widely available electric start systems, remote steering and throttle controls, and through-the-propeller hub exhaust systems that reduced noise significantly compared to earlier atmospheric exhaust. The 1956-1970 era was particularly significant as it bridged the gap between the post-war boom in recreational boating and the more regulated, emissions-conscious designs of later decades. These motors are still widely used today on vintage boats, restored classic watercraft, and as reliable utilitarian power for everyday use. SERVICE AND REPAIR SCOPE: - Johnson Evinrude 1956-1970 1.5-40 HP General Information - Johnson Evinrude Safety procedures and precautions - Johnson Evinrude Tune-up specifications and adjustment procedures - Johnson Evinrude Powerhead - piston, cylinder, crankshaft overhaul - Johnson Evinrude Fuel system - carburetor rebuild, fuel pump diaphragm - Johnson Evinrude Ignition - magneto, flywheel, points, condenser - Johnson Evinrude Electrical system - lighting coil, generator, wiring - Johnson Evinrude Accessories - remote controls, tilt mechanisms - Johnson Evinrude Lower unit - gearcase, forward/reverse mechanism - Johnson Evinrude Hand starter - rewind spring, pawl assembly - Johnson Evinrude Maintenance schedules and lubrication points - Johnson Evinrude Troubleshooting flowcharts for all failure patterns - Magneto ignition point gap setting and timing to flywheel - Carburetor float level adjustment and needle valve seating check - Water pump housing, impeller vane orientation, and wear plate - Gearcase oil seal driver installation procedure - Propeller shaft seal replacement without gearcase disassembly - Thermostat or temperature control valve operation check - Exhaust reed valve inspection and plate replacement - Shift mechanism linkage and dog clutch engagement adjustment - Compression test specifications per model and cylinder TECHNICAL SPECIFICATIONS: - Manufacturers: Johnson / Evinrude (OMC) - Years: 1956-1970 - Horsepower range: 1.5 HP to 40 HP - Models covered per horsepower: - 1.5 HP, 3.0 HP, 4.0 HP, 5.0 HP, 5.5 HP - 6.0 HP, 7.5 HP, 9.5 HP, 10 HP - 15 HP, 18 HP, 20 HP - 25 HP, 28 HP, 30 HP, 33 HP, 35 HP, 40 HP - Engine type: Two-stroke, carbureted - Cylinder configuration: 1-cylinder through multi-cylinder - Ignition: Flywheel magneto with breaker points and condenser - Cooling: Raw water pump impeller, thermostat-equipped on larger models - Gearcase: Forward-neutral-reverse on models above approximately 10 HP - Starting: Hand rewind start (electric start on select later variants) DIAGNOSTIC INFORMATION: - Engine fires but will not stay running: inspect carburetor idle circuit for varnish buildup, check fuel line primer bulb integrity, verify fuel tank vent is open - Engine runs on one cylinder only (multi-cylinder models): test each spark plug with inline tester, inspect magneto distributor cap for carbon tracking, check individual cylinder compression - Water pump not priming: inspect impeller vanes for set or cracking, verify keyed drive on shaft is intact, check housing for groove wear - Gearcase will not shift into forward: shift dog engagement teeth inspection, clutch spring tension check, linkage rod end play adjustment - Overheating at constant speed: inspect thermostat for proper opening, clean cooling passages of mineral scale, verify correct propeller pitch for load - Magneto spark weak: inspect breaker point face pitting, check condenser capacitance, verify flywheel magnet strength, clean contact surfaces - Excessive vibration at cruising speed: inspect propeller hub for spun rubber insert, check propeller blade damage, verify crankshaft keyway integrity - Fuel leaking from carburetor overflow: replace float needle and seat, check float for puncture, verify float arm pivot pin not binding ILLUSTRATIONS AND DIAGRAMS INCLUDED: - Powerhead exploded views for single through multi-cylinder configurations - Magneto flywheel with breaker point and condensser timing marks - Carburetor cross-section with float, needle, main jet, and idle circuit - Lower unit gearcase showing forward/reverse clutch dog mechanism - Water pump housing with impeller vane orientation diagram - Hand rewind starter with spring, pawl, and cup assembly - Throttle and shift control routing diagrams - Wiring diagram for lighting coil and generator systems - Propeller shaft seal installation cross-section COMPATIBILITY: - Johnson outboard motors: 1.5, 3.0, 4.0, 5.0, 5.5, 6.0, 7.5, 9.5, 10, 15, 18, 20, 25, 28, 30, 33, 35, 40 HP (1956-1970) - Evinrude outboard motors: matching horsepower ratings (1956-1970) - All two-stroke carbureted models in this horsepower range - Hand rewind and select electric start variants - File format: Searchable PDF FILE PROPERTIES: - Format: Searchable PDF - Language: English - Delivery: Instant digital download - Access: Download anytime after purchase