1969-1976 Chrysler 20 HP Service Repair Workshop Manual PDF VEHICLE/EQUIPMENT INTRODUCTION: The Chrysler 20 HP outboard motor was produced during the late 1960s through mid-1970s, a period when Chrysler Marine was a significant American outboard manufacturer. These inline two-cylinder two-stroke engines were designed for small fishing boats light utility craft and jon boats, delivering reliable propulsion that was straightforward to maintain and repair. Chrysler Marine outboards featured loop-charged scavenging and a gear-driven lower unit that defined the basic architecture shared across much of the lineup. The 20 HP model struck an excellent balance between portable convenience and sufficient power for small watercraft, and it became quite popular among casual boaters who valued simplicity over complexity. Today, these vintage outboards continue running on lakes and rivers thanks to dedicated owners who maintain them using the original factory service specifications documented in this manual. SERVICE & REPAIR SCOPE: - Complete engine tune-up including carburetor cleaning and adjustment - Spark plug selection gap specification replacement interval - Ignition system magneto testing and timing procedure - Carburetor float level adjustment jet identification and sizing - Electric starter motor bench testing and brush inspection - Manual recoil starter rope replacement and spring rewind - Fuel system tank line primer bulb and fuel pump inspection - Gear case lower unit oil change and seal inspection - Powerhead removal piston inspection ring replacement - Propeller removal pitch selection damage assessment - Steering handle friction adjustment and tilt mechanism - Electrical system including alternator wiring and charging output - Cooling system water pump impeller inspection and replacement - Engine mounting bolt torque specifications and alignment - Complete wiring schematic for electrical start models TECHNICAL SPECIFICATIONS: - Manufacturer: Chrysler Marine - Engine type: Two-stroke, inline two-cylinder - Horsepower: 20 HP - Model years: 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976 - Starting options: Manual recoil and electric start variants - Ignition: Flywheel magneto system - Carburetion: Chrysler carburetor with float bowl - Gear ratio: Refer to manual for specific year - Fuel mixture: Pre-mix oil and gasoline (oil injection available on select years) - Propeller: Standard spline shaft mounting DIAGNOSTIC INFORMATION: - Engine will not start: Verify fuel supply from tank and line, check spark at both plug wires using spark tester, confirm ignition timing at TDC mark, inspect carburetor float for puncture and sticking, check primer bulb function and fuel line routing - Engine runs on one cylinder or misfires: Test spark on both cylinders individually, clean and adjust carburetor float level, check reed or rotary valve timing, inspect spark plug condition and electrode gap, verify compression on both cylinders is relatively equal - Engine overheating: Remove water pump housing inspect impeller for worn or missing vanes, replace impeller, check cooling passages for blockage by debris or mineral deposits, examine water pump gasket sealing surfaces - Gear case oil contaminated with water or metal: Drain lower unit and inspect fluid condition, replace gear housing seals, check propeller shaft seal for wear, refill with specified gear lube quantity, test for leak by pressurizing with air - Excessive smoke from engine: Verify oil-to-gas mixture ratio is correct for model year specification, check oil injection system calibration if equipped, inspect piston ring condition for blow-by condition, verify carburetor is not running rich - Starting motor engages but does not turn engine: Remove and bench test starter motor, inspect drive pinion and flywheel ring gear teeth for damage, check battery condition and cable connections, test solenoid continuity ILLUSTRATIONS & DIAGRAMS INCLUDED: - Powerhead assembly showing crankcase pistons and cylinder arrangement - Carburetor exploded view with jet sizing identification - Magneto ignition system wiring schematic - Gear case internal arrangement with bearing and seal detail - Water pump impeller installation cross-section - Electric starter motor assembly and circuit diagram - Propeller shaft and spline arrangement - Engine mounting and steering handle detail COMPATIBILITY: - Chrysler 20 HP outboard model years 1969-1976 - Both manual recoil and electric start variants - All serial number ranges within covered production years FILE PROPERTIES: - Format: Searchable PDF - Language: English - Delivery: Instant digital download - Access: Download anytime after purchase