Harley Davidson Big Twins 1940-1947 Factory Service Manual

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UGS: 64465

Mots clés: 1940 1941 1942 1943 1944 1945 1946 1947 Big Twins Harley Davidson Misc Motorcycle Motorcycles

Variantes de produits

Description

This manual covers Big Twin motorcycles produced from 1940 through 1947. These iconic V-twin machines are celebrated for their robust engineering, distinctive designs, and the enduring legacy of American motorcycle manufacturing. During this period, significant advancements were introduced in the Big Twin lineup, including the Knucklehead and Panhead engine configurations, which established the brand's reputation for power and reliability. The models from these years are highly valued by collectors and enthusiasts for their historical significance and classic riding experience. This comprehensive factory service repair manual provides detailed information essential for the maintenance, troubleshooting, and repair of your Big Twin. It includes in-depth coverage of all major systems, such as the engine, transmission, electrical system, fuel system, brakes, and suspension. You will find step-by-step procedures for routine maintenance, adjustments, and complex repairs, alongside diagnostic guides and technical specifications. This manual is an indispensable resource for owners, mechanics, and technicians seeking to preserve the authenticity and ensure the optimal performance of these historically important motorcycles.

🏷️ Basic Information

Identification

Make:

Harley-Davidson

Model:

Big Twin

Model Years Covered:

1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947

Codes

Oem Manual Code:

Likely an internal Harley-Davidson service bulletin or manual series for this era, specific code not provided in product info but representative of factory documentation.

👋 Introduction

Market Position

Historical Significance:

These Harley-Davidson Big Twins represent a crucial era of American motorcycle manufacturing, known for their robust engineering and iconic design.

Competitive Analysis

Market Niche:

The manual targets owners and restorers of vintage Harley-Davidson motorcycles, a passionate segment of the classic vehicle market.

Key Features

Resource Value:

Essential for maintaining, repairing, or restoring these historically significant machines, ensuring authenticity and proper function.

📋 Manual Details

Coverage Areas

Manual Type:

Factory Service Repair Manual

Language:

English

Format:

PDF Download

Completeness:

Complete Official Factory Manual

📖 Manual Coverage

Systems Covered

Engine:

Detailed coverage of Harley-Davidson Big Twin engines, including disassembly, assembly, tuning, and troubleshooting.

Transmission:

Comprehensive instructions for the transmission system, including maintenance, repair, and adjustment.

Electrical System:

In-depth coverage of the electrical system, including wiring diagrams, ignition, lighting, and charging systems.

Fuel System:

Detailed information on the fuel delivery system, including carburetor maintenance, fuel lines, and filters.

Braking System:

Service procedures for the braking system, including maintenance and adjustments.

Suspension And Steering:

Guidance on the front fork, rear suspension, and steering mechanisms.

Chassis And Frame:

Information related to the motorcycle's frame, including inspections and repairs.

Bodywork And Trim:

Details on the fenders, tanks, and other body components.

Procedures Included

Maintenance:

Routine maintenance tasks, including oil changes, filter replacements, and lubrication schedules.

Troubleshooting:

Diagnostic procedures and solutions for common problems encountered with these models.

Repair:

Step-by-step instructions for engine rebuilds, transmission overhauls, and other major repair tasks.

Adjustment:

Procedures for adjusting clutch, brakes, ignition timing, and carburetor settings.

Inspection:

Guidelines for inspecting critical components for wear and damage.

Technical Depth

Depth Level:

Comprehensive factory-level detail, suitable for both experienced mechanics and dedicated enthusiasts.

Diagnostic Capabilities:

Detailed diagnostic flowcharts and symptom-based troubleshooting guides.

Rebuild Information:

Full engine and transmission rebuild specifications, including torque values and clearances.

📊 Manual Specifications

File Format

File Type:

Searchability:

Likely text-searchable if the PDF was created from an OCR'd document or original digital source.

Print Quality

Printability:

Designed for printing, allowing users to create physical copies of specific sections or the entire manual.

Binding Type

Binding Recommendation:

Ideal for spiral binding or comb binding for ease of use in a workshop environment.

Paper Type

Paper Recommendation:

Recommended for printing on durable, grease-resistant paper suitable for workshop conditions.

⚙️ Engine Specifications

Primary Engine

Engine Type:

Air-cooled, V-twin, overhead valve (OHV) OHV

Displacement Range:

Typically 74 cubic inches (1200cc) and 80 cubic inches (1310cc) for Big Twin models of this era.

Bore X Stroke:

Varies by specific displacement, e.g., 74ci: 3.4375 in. x 4.00 in. (87.3mm x 101.6mm); 80ci: 3.4375 in. x 4.3125 in. (87.3mm x 109.5mm)

Performance

Horsepower Estimate:

Approximately 25-35 HP (varies by engine size and tuning).

Torque Estimate:

Significantly geared for low-end torque, characteristic of classic V-twins.

Fuel System

Carburetor Type:

Typically Linkert carburetors or early equivalents. Manual will cover specific models and settings.

Fuel Octane Rating:

Requires leaded gasoline of appropriate octane for the era. Manual will specify.

🔧 Transmission

Standard

Transmission Type:

3-speed or 4-speed manual transmission, foot-clutch, hand-shift operation was common.

Optional

Gear Ratios:

Specific gear ratios will be detailed in the manual for each transmission variant.

Features

Clutch Type:

Typically a dry plate clutch, operated by a foot pedal.

Shift Mechanism:

Hand-operated shift lever on the right side of the tank or frame.

📐 Dimensions

Exterior

Wheelbase:

Varies by model, but generally around 57-60 inches (approx. 145-152 cm).

Weights

Dry Weight:

Typically in the range of 550-650 lbs (approx. 250-295 kg).

🛡️ Safety Features

Ratings

Safety Standards Era:

Safety features and regulations were significantly different in this era. Manual focuses on mechanical integrity and proper operation.

Active Features

Braking System Type:

Drum brakes on front and rear wheels.

Passive Features

Frame Construction:

Robust steel frame designed for stability and durability.

💡 Technology Features

Infotainment

Infotainment Features:

None, as these are pre-electronic era motorcycles. Focus is on mechanical function and rider control.

Driver Assistance

Driver Assistance Features:

None. Technology is entirely mechanical and rider-controlled.

Connectivity

Connectivity Features:

None. Purely mechanical operation.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically recommended every 1000-2000 miles or annually, depending on usage. Manual provides specific guidance.

Ignition Timing Check:

Regular checks and adjustments for optimal performance and engine health.

Fluid Specifications

Engine Oil Type:

Primarily SAE 50 or SAE 60 straight-weight mineral oil (non-detergent recommended for older engines). Specific viscosity and quantity in manual.

Transmission Oil Type:

Gear oil suitable for heavy-duty transmissions, likely SAE 90 or SAE 140. Manual specifies exact type and capacity.

Primary Chaincase Oil Type:

Motor oil (same as engine oil or specified equivalent) is often used in the primary chaincase. Manual will detail.

Known Issues

Carburetor Tuning:

Linkert carburetors can be finicky and require precise adjustment. Manual provides tuning procedures.

Oil Leaks:

Common in vintage motorcycles due to aging seals and gaskets. Manual guides on seal replacement and gasket maintenance.

Ignition System Maintenance:

Points and condenser require regular cleaning and adjustment. Manual covers ignition system troubleshooting.

Valve Adjustment:

Periodic valve lash adjustments are crucial for engine performance. Manual details the correct procedure.

📚 Vehicle History

Brand Heritage

Harley Davidson Legacy:

Harley-Davidson has a long-standing reputation for building powerful, American-made motorcycles, particularly their V-twin engines.

Model Evolution

Big Twin Development:

The Big Twin line evolved from earlier Flathead models, introducing the OHV Knucklehead and Panhead designs during this period, characterized by their distinctive valve cover shapes.

Production

Production Period Context:

This period includes World War II, during which Harley-Davidson also produced motorcycles for military use, influencing design and manufacturing processes.

🏆 Awards & Recognition

Recognitions

Historical Recognition:

Harley-Davidson Big Twins from this era are highly sought after by collectors and are recognized as icons of American industrial design and automotive history.

Ratings

Restoration Quality:

The manual is critical for achieving concours-level restorations due to its comprehensive and accurate information.

Certifications

Factory Certification:

As an official factory service manual, it provides the definitive procedures and specifications for these vehicles.