🏷️ Basic Information Identification Make: Harley-Davidson Model: SV Big Twin V-Twin Flathead Engine Type: Side Valve (SV) V-Twin Flathead Product Name: HARLEY DAVIDSON Service Manual SV BIGTWIN V-TWIN FLATHEAD Factory Repair Manual 1937-1959 👋 Introduction Market Position Target Audience: Harley-Davidson owners, mechanics, restorers, and enthusiasts of vintage Flathead V-Twins. Competitive Analysis Value Proposition: Provides factory-level repair and maintenance information for a crucial period of Harley-Davidson's history, enabling self-sufficiency in maintenance and restoration. Key Features Digital Access: Instant download, accessible on multiple devices, easy to save and search. Technical Documentation: Official factory data, ensuring accuracy and completeness for servicing these iconic motorcycles. 📋 Manual Details Coverage Areas Model Years Covered: 1937, 1938, 1939, 1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959 Engine Variants Covered: SV Big Twin Flathead (e.g., 45 ci, 74 ci) Model Lines Covered: WL, WLA, WLC, G, GE, DL, RL, UL, ULH, VL, VLH (specific models within the Flathead Big Twin and 45ci lines) Page Count Estimated Page Count: Up to 5000+ pages (based on typical factory manual size for this era and scope, though actual file size is stated up to 5GB) Manual Type Manual Type: Factory Service Manual / Repair Manual / Workshop Manual Language Language: English Format Delivery Format: Digital Download (PDF, ZIP, RAR, EXE) File Compatibility: Windows, Linux, Mac OS (requires PDF reader, ZIP/RAR extractor) 📖 Manual Coverage Systems Covered Engine: Complete engine overhaul, tuning, diagnostics, lubrication, cooling, intake, exhaust, ignition, starting, fuel delivery (carburetor rebuilding and adjustment), internal component specifications. Transmission: Gearbox operation, maintenance, repair, troubleshooting, clutch assembly, primary drive. Electrical: Ignition system (magneto, coil, points), lighting, charging system (generator/alternator), wiring diagrams, component testing, troubleshooting. Chassis And Suspension: Frame, front fork (springer/hydra-glide), rear suspension (if applicable), wheels, hubs, bearings, steering head. Brakes: Drum brake system maintenance, adjustment, and repair. Fuel System: Fuel tank, fuel lines, petcock, carburetor (e.g., Linkert) disassembly, cleaning, adjustment, and rebuilding. Bodywork And Trim: Fenders, tanks, seats, controls, basic body panel removal and installation. Procedures Included Maintenance: Routine servicing, lubrication schedules, fluid changes, filter replacements, spark plug replacement, tire pressure checks, battery maintenance. Troubleshooting: Systematic diagnostic procedures for common and uncommon problems, fault finding guides. Repair: Detailed step-by-step instructions for component removal, overhaul, rebuilding, and reinstallation. Diagnostics: Engine performance analysis, ignition timing checks, carburetor adjustments, electrical circuit testing. Restoration: Guidance applicable to restoration projects, including component identification and correct procedures. Technical Depth Depth Of Information: Comprehensive, suitable for professional mechanics and experienced DIY enthusiasts; covers full rebuilds and complex repairs. Illustrations: Illustrated with clear step-by-step instructions, exploded views, diagrams, and schematics. Data Included: Torque specifications, clearances, tolerances, fluid capacities, wiring diagrams, part identification. 📊 Manual Specifications File Format File Type: PDF (potentially zipped) File Size: Up to 5 GB Print Quality Printability: Printable (no restrictions mentioned) Illustration Quality: Zoomable illustrations, clear graphics Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Design: Flathead V-Twin (Side Valve) Bore X Stroke 45Ci: 2.745 in x 3.8125 in (69.7 mm x 96.8 mm) Displacement 45Ci: 45 cubic inches (738 cc) Displacement 74Ci: 74 cubic inches (1210 cc) Valve Arrangement: SV (Side Valve) - Valves located on one side of the cylinder block Performance Horsepower Range: Typically 20-30 HP depending on specific model and year (exact figures not provided in product info, but typical for era) Torque Output: Varies by displacement and tuning, detailed in manual Fuel System Carburetor Examples: Linkert carburetors common; manual covers rebuilding and tuning. Fuel Type: Gasoline (lead-containing fuels common for the era) 🔧 Transmission Standard Transmission Type: 3-speed or 4-speed manual constant mesh Clutch Type: Dry multi-plate Features Gearshift Operation: Hand-operated (tank shift) or foot-operated depending on year and model. 📐 Dimensions Exterior Wheelbase: Varies by model, typically around 56-60 inches (manual will specify) Weights Dry Weight: Typically 400-600 lbs depending on model (manual will specify) 🛡️ Safety Features Ratings Safety Features Era: Emphasis on mechanical reliability; safety features basic by modern standards. Drum brakes, limited lighting. Active Features Braking System: Mechanical drum brakes front and rear. 💡 Technology Features Infotainment Infotainment System: N/A (Technology of the era focused on mechanical function, not electronics-based infotainment). Driver Assistance Driver Assistance Systems: N/A (No electronic driver assistance systems present). Connectivity Connectivity Features: N/A (No electronic connectivity features). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 1,000-2,000 miles or annually; manual will specify exact intervals and procedures. Tune Up Frequency: Regular tuning recommended, especially for ignition and carburetor adjustments. Manual provides guidelines. Fluid Specifications Engine Oil: Specific viscosity oil required (e.g., SAE 50 or 60, mineral oil recommended for this era). Manual will detail exact specifications. Transmission Oil: Specific gear oil viscosity required. Manual will detail exact specifications. Primary Chain Case Oil: Specific oil for the primary drive. Manual will...