🏷️ Basic Information Identification Make: Harley-Davidson Model: EL / FL "Knucklehead" Model Years Covered: 1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947 Codes Manual Product Name: Harley Davidson Knucklehead 1940-1947 Workshop Service Repair Manual 👋 Introduction Market Position Target Audience: Professional technicians, DIY mechanics, and enthusiasts of vintage Harley-Davidson motorcycles. Key Features Convenience: Instant download eliminates shipping costs and wait times. Accuracy: Represents original manufacturer data for the most accurate repair information. Utility: Print specific sections as needed for workshop use, keeping the digital copy clean. Competitive Analysis Value Proposition: Provides factory-level repair and maintenance guidance, saving on professional labor costs for owners. 📋 Manual Details Coverage Areas General Coverage: Comprehensive repair, service, maintenance, and troubleshooting for Harley-Davidson Knucklehead models 1940-1947. Page Count Estimated Page Count: Hundreds of pages (exact count not specified, but described as substantial for detailed information). Manual Type Type: Workshop Service Repair Manual / Factory Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Detailed overhaul, repair, and maintenance of the Harley-Davidson OHV V-twin engine (Knucklehead). Transmission: Service, repair, and maintenance of the four-speed constant mesh transmission. Electrical System: Includes comprehensive wiring diagrams, troubleshooting, and repair procedures for the ignition, lighting, and charging systems. Fuel System: Carburetor (e.g., Linkert) service, adjustment, and repair; fuel tank and lines. Brakes: Service and maintenance of front and rear braking systems (typically drum brakes for this era). Suspension: Front fork (Spring fork) overhaul and maintenance; rear suspension components and service. Chassis And Frame: Frame inspection, repair, and related component mounting. Bodywork And Trim: Fenders, fuel tank, saddlebags, and related trim component service. Procedures Included Maintenance: Periodic maintenance charts, lubrication schedules, and routine servicing. Troubleshooting: Detailed diagnostic procedures and symptom-based troubleshooting guides. Repair: Step-by-step instructions for component disassembly, repair, and reassembly. Overhaul: Complete engine and transmission overhaul procedures. Diagnostics: System diagnostics for electrical and mechanical issues. Technical Depth Depth: Suitable for professional technicians and experienced DIY mechanics, covering everything from basic maintenance to complete engine rebuilds. 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: Full Printable Zoom Functionality: Zoom IN/OUT enabled for detailed viewing Binding Type Binding: N/A (Digital Download) Paper Type Paper Quality: N/A (Digital Download) Requirements Software Requirements: Adobe PDF Reader & WinRAR Compatibility Operating Systems: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Type: Overhead Valve (OHV) V-twin Engine Displacement El: 61 cubic inches (approx. 999 cc) Engine Displacement Fl: 74 cubic inches (approx. 1212 cc) Performance Horsepower: Typically in the range of 30-40 HP, depending on specific year and tune. Torque: Estimated 50-60 ft-lbs, variable by specific model and engine tune. Fuel System Carburetor: Primarily Harley-Davidson Linkert carburetor (e.g., M series). Cooling System Cooling Method: Air-cooled Lubrication System Oil System: Total loss oiling system (oil is consumed/not recirculated). 🔧 Transmission Standard Transmission Type: 4-speed constant mesh manual gearbox Features Clutch: Dry, multi-plate clutch 📐 Dimensions Exterior Wheelbase: Approximately 58-60 inches (Varies slightly by model year). Weights Dry Weight: Approximately 500-550 lbs (Varies by model, EL vs. FL). 🛡️ Safety Features Ratings Crash Test Ratings: N/A (Vehicles from this era were not subjected to modern crash testing standards). Passive Features Lighting: Headlight, taillight, brake light, turn signals (where applicable/added). Active Features Braking System: Drum brakes (front and rear). 💡 Technology Features Infotainment Infotainment System: N/A (No factory infotainment systems from this era). Driver Assistance Driver Assistance Features: N/A (No driver assistance features). Connectivity Connectivity Options: N/A (No electronic connectivity features). 🔧 Maintenance Service Intervals Oil Change Interval: Frequent oil changes recommended, often at every 500-1000 miles, due to the total loss system. Refer to manual for exact intervals. Tune Up Interval: Regular tune-ups recommended every 2,000-3,000 miles, including ignition timing, carburetor adjustment, and valve lash check. Fluid Specifications Engine Oil Type: SAE 50 or SAE 60 motorcycle-specific oil (e.g., Harley-Davidson Genuine Parts motorcycle oil or equivalent). Transmission Oil Type: Gear oil suitable for Harley-Davidson transmissions of the era (e.g., SAE 80W-90 or specific Harley-Davidson specified lubricant). Primary Chaincase Oil: Harley-Davidson primary lubricant or equivalent. Known Issues Valve Train Wear: Potential for wear in the valve guides and rocker arms due to heat and lubrication. Regular adjustment is crucial. Carburetor Performance: Linkert carburetors can be finicky and require precise adjustment for optimal performance. Oil Leaks: Common on vintage motorcycles of this era; proper gasket and seal maintenance is essential. Electrical System Reliability: Older electrical components (generators, regulators, wiring) may require attention and potential upgrades for reliability. Parts And Supplies Key Parts Covered: Engine components (pistons, cylinders, crankshaft, camshaft), transmission gears, clutch plates, electrical parts (magneto, generator), brakes, suspension components, fuel system parts. 📚 Vehicle History Brand Heritage Brand History: Harley-Davidson, founded in 1903, has a long legacy of producing iconic American motorcycles known for their V-twin engines and robust construction. Model Evolution Knucklehead Introduction: The Knucklehead,...