🏷️ Basic Information Identification Make: Harley-Davidson Model: EL (Knucklehead) Year: 1947 Product Name: Harley Davidson Knucklehead 1947 All Service Manual Repair Download Generation Generation: Knucklehead Series (1936-1947) 👋 Introduction Market Position Target Audience: Owners, enthusiasts, and mechanics specializing in vintage Harley-Davidson motorcycles, particularly the iconic Knucklehead models. Competitive Analysis Value Proposition: Provides essential, in-depth technical guidance for maintaining and repairing a valuable classic motorcycle, enabling DIY service and cost savings. Key Features Accessibility: Instant download format for immediate access to repair information. Comprehensiveness: Covers virtually all aspects of the motorcycle's mechanical and electrical systems. 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive service, repair, maintenance, and troubleshooting for the 1947 Harley-Davidson EL (Knucklehead) motorcycle. Specific Systems Covered: Engine, Transmission, Brakes, Electrical System, Wiring Diagrams, Suspension, Steering, Fuel System, Cooling System, Chassis, Body, Lubrication, Emissions, Engine Control, Axles, Restraint System, Troubleshooting. Page Count Estimated Page Count: 200-400 (estimated, typical for comprehensive factory-style manuals) Manual Type Manual Type: Service and Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Service Repair: Detailed procedures for engine disassembly, assembly, inspection, repair, and tuning of the 74 cubic inch (1200cc) OHV V-twin engine. Transmission Service Repair: Information on the 4-speed constant mesh gearbox, including clutch, shifting mechanisms, and internal component service. Brake System: Maintenance and repair of the mechanical drum brake systems (front and rear). Wiring Diagram: Complete electrical system schematics, including lighting, ignition, and charging circuits. Electrical System: Troubleshooting and repair of the battery, generator, ignition system (magneto or battery ignition), and lighting. Suspension: Service procedures for the springer front fork and the hardtail rear suspension. Fuel System: Details on the carburetor (e.g., Linkert M-series), fuel tank, lines, and petcock. Chassis Body: Frame inspection, bodywork maintenance, fender, saddlebag (if applicable), and mounting hardware. Periodic Lubrication: Comprehensive lubrication chart and procedures for all grease points, oil changes, and gearbox lubrication. Procedures Included Disassembly Reassembly: Step-by-step instructions for complete disassembly and reassembly of major components. Troubleshooting: Diagnostic guides and common problem identification for engine, electrical, and mechanical issues. Maintenance: Routine maintenance tasks such as ignition timing, carburetor adjustment, and brake checks. Refurbishing Renovating: Guidance on restoring and refurbishing various parts and systems to original specifications. Technical Depth Technical Depth: In-depth, covering from basic maintenance to complete engine and transmission rebuilds. Suitable for home mechanics and professional restorers. 📊 Manual Specifications File Format File Format Details: Portable Document Format (PDF). Requires Adobe Acrobat Reader or compatible PDF viewer. Print Quality Print Quality: High-resolution scans of original factory or professional service manuals, ensuring clarity of text and diagrams. Binding Type Binding Type: N/A (Digital Download - PDF) Paper Type Paper Type: N/A (Digital Download - PDF) Compatibility Operating Systems: Compatible with all versions of Windows and macOS. Archiving Format Archiving Format: May require WinZip or similar software for extraction if delivered as a compressed archive. ⚙️ Engine Specifications Primary Engine Engine Type: Overhead Valve (OHV) V-twin Displacement: 74 cubic inches (1200cc) Bore X Stroke: 3.3125 in x 3.50 in (84.1 mm x 88.9 mm) Compression Ratio: Approximately 6.0:1 (varies with models and tuning) Performance Horsepower: Estimated 25-30 HP at 4000 RPM (varies by specific model and state of tune) Torque: Not typically quoted in HP/RPM, but substantial low-end torque characteristic of Harley-Davidson. Fuel System Carburetor Type: Linkert M-series (e.g., M5, M6, M74B) Fuel Type: Leaded gasoline (historically), modern equivalents with appropriate octane rating. Ignition System Ignition Type: Battery and Coil or Magneto (depending on specific sub-model or modifications) 🔧 Transmission Standard Transmission Type: 4-speed constant mesh, hand-shifted, foot-clutched Optional Optional Transmission: N/A for 1947 model year Features Clutch Type: Dry multi-plate Gear Selection: Right-hand shift lever (often with suicide clutch pedal) 📐 Dimensions Exterior Wheelbase: Approximately 57.5 inches (1460 mm) Length: Approximately 86 inches (2184 mm) Weights Dry Weight: Approximately 525-560 lbs (238-254 kg), depending on configuration. 🛡️ Safety Features Ratings Safety Ratings: N/A for period-specific vehicles. Safety features are primitive by modern standards. Active Features Active Safety: Mechanical drum brakes, robust frame construction. Passive Features Passive Safety: No airbags or modern passive restraint systems. Rider skill is paramount. 💡 Technology Features Infotainment Infotainment System: N/A. Technology is purely mechanical. Driver Assistance Driver Assistance Features: N/A. Connectivity Connectivity Features: N/A. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 1,000-2,000 miles or annually, depending on usage and oil type. Tune Up Interval: Ignition timing and carburetor adjustments recommended every 3,000-5,000 miles or as needed. Fluid Specifications Engine Oil Type: Viscosity typically SAE 50 or SAE 60, often straight-weight oils. Historically, specialized motorcycle oils like HD 360 were used. Modern mineral-based motorcycle oils are recommended. Transmission Oil Type: Gear oil, often SAE 90 or SAE 140. Specific Harley-Davidson transmission fluids were available. Primary Chain Case Oil: Similar to transmission oil, SAE 90 or SAE 140, or specialized primary lubricant. Known Issues Common Wear...