Target Audience:
Mechanics and DIY enthusiasts working on Harley-Davidson WLA motorcycles.
Value Proposition:
Provides instant access to comprehensive repair and maintenance information, saving time and money compared to traditional manuals or professional services.
Accessibility:
Instant download via secure payment processor, accessible on Windows, Mac, and Linux OS.
Usability:
Easy-to-read explanations, detailed illustrations, and step-by-step procedures simplify complex tasks.
Completeness:
100% complete and intact, no missing or corrupt pages/sections.
Engine:
Detailed disassembly, assembly, repair, adjustment, and troubleshooting of the Harley-Davidson flathead V-twin engine.
Transmission:
Coverage for the transmission system, including disassembly, assembly, repair, and adjustments.
Fuel System:
Information on carburetors, fuel lines, fuel pumps, and fuel tank maintenance and repair.
Electrical System:
Wiring diagrams, ignition system, lighting, charging system, and component testing.
Chassis:
Frame, front fork (including girder fork variations), rear suspension, and wheel assembly.
Brakes:
Operation, maintenance, and repair of braking systems, likely drum brakes for this era.
Bodywork:
Fenders, fuel tank, seat, handlebars, and other body components.
Maintenance:
Routine maintenance, lubrication, fluid changes, and periodic service checks.
Troubleshooting:
Diagnostic procedures for identifying and resolving common mechanical and electrical issues.
Repair:
Comprehensive step-by-step repair instructions for all major vehicle components.
Disassembly:
Detailed instructions for taking apart various systems and components.
Assembly:
Step-by-step guidance for reassembling components after repair or overhaul.
Adjustments:
Procedures for setting ignition timing, valve clearances, carburetor settings, clutch adjustments, etc.
Tightening Torques:
Includes specific tightening torque values for critical fasteners and threaded connections, crucial for assembly integrity.
Diagnostics:
Includes diagnostic information to aid in troubleshooting and identifying root causes of issues.
Depth Of Information:
Highly detailed, comprehensive step-by-step procedures with pictorial diagrams, exploded views, and photographs, suitable for both professional mechanics and DIY enthusiasts.
Special Tools:
References special service tool numbers and illustrates their usage, essential for accurate repairs and adjustments.
Wear Limits:
Provides wear limits for components, enabling precise assessment of part condition during servicing.
Construction And Function:
Explains the construction and function of systems and components before detailing repair procedures, enhancing understanding.
Engine Type:
Air-cooled, 45 cubic inch (740cc) V-twin, side-valve (flathead) OHV.
Bore X Stroke:
Approx. 2.75 in. x 3.00 in. (70 mm x 76 mm)
Compression Ratio:
Varies by specific WLA variant and year, typically around 5.0:1 to 6.0:1.
Horsepower:
Estimated 18-25 HP (actual figures varied by year and tuning).
Torque:
Not explicitly stated but substantial low-end torque characteristic of flathead engines.
Carburetor:
Typically Linkert or Schebler carburetors, specific models vary by year.
Oil System:
Total loss oiling system (oil is consumed/expelled).
Length:
Varies by model configuration, approximately 85-90 inches (2159-2286 mm).
Width:
Varies, approximately 35-40 inches (889-1016 mm) at handlebars.
Height:
Varies, approximately 40-45 inches (1016-1143 mm) to handlebars.
Dry Weight:
Approximately 500-550 lbs (227-250 kg).
Gross Vehicle Weight Rating:
Not typically specified for motorcycles in this era, but safe operating load is considered.
Wheelbase:
Approximately 57.5 inches (1460 mm).
Crash Test Results:
N/A (Motorcycles of this era were not subjected to standardized crash testing as found in modern vehicles).
Braking System:
Drum brakes front and rear.
Lighting:
Headlight, taillight, brake light, and indicators (where applicable by year).
Frame Construction:
Robust steel frame designed for durability and military use.
Oil Change:
Frequent oil changes and top-offs are critical due to the total loss oiling system. Specific intervals depend on usage and recommendations within the manual.
Tune Up:
Regular checks of ignition timing, carburetor settings, and valve clearances are essential.
Engine Oil:
Specific SAE viscosity grades (e.g., SAE 50 or SAE 60, possibly specific Harley-Davidson grades) and type (mineral oil is standard for this era). Manual will list exact specifications.
Transmission Oil:
Manual will specify the correct type and viscosity of transmission oil.
Primary Chain Case Oil:
Manual will specify the correct type and viscosity of primary chain case oil.
Flathead Leaks:
Flathead engines are known for minor oil leaks due to their design and seal limitations; proper maintenance is key.
Carburetor Tuning:
Linkert carburetors can require frequent adjustment for optimal performance and starting.
Electrical Reliability:
Older electrical systems can be prone to wear and require careful inspection and maintenance.
Gasket Seals:
Original sealing materials may degrade over time, necessitating replacement with modern equivalents.
Manufacturer:
Harley-Davidson Motor Company.
Development Purpose:
Developed for military use, particularly during World War II, hence the 'WLA' designation (W = Harley-Davidson model designation, L = High compression, A = Army).
Key Variants:
Various sub-models and configurations existed for different military branches and purposes, including civilian versions.
Production Period:
Significant production for military contracts during WWII, with civilian variants and continued production/evolution into the 1970s under the 'flathead' lineage.
Manufacturing Location:
Milwaukee, Wisconsin, USA.