Harley Davidson Knucklehead 1940-1947 Full Service Repair Manual

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Art.-Nr: 57759

Stichworte: 1940 1941 1942 1943 1944 1945 1946 1947 Engines Harley Davidson Knucklehead Motorcycle

Produktvarianten

Beschreibung

This manual covers the motorcycle produced between 1940 and 1947. The Knucklehead is renowned for its revolutionary design, featuring distinctive overhead valve rocker boxes and a robust V-twin engine available in 61 cubic inch (E series) and 74 cubic inch (F series) displacements. This iconic American motorcycle represents a significant era in engineering heritage, known for its powerful performance and distinct styling. Its construction emphasizes mechanical purity and rider connection, making it a highly collectible and historically important machine for enthusiasts and restorers. This comprehensive English-language service manual provides detailed information for the maintenance, repair, and overhaul of the FL Knucklehead. It covers all major systems, including the Knucklehead OHV engine (E and F series), the 4-speed constant mesh transmission, clutch, primary drive, electrical system, Linkert M-series carburetor, and braking systems. The manual includes step-by-step repair instructions, diagnostic procedures, scheduled maintenance guidelines, and technical specifications. It is designed to assist owners, mechanics, and technicians in keeping these classic motorcycles in optimal condition, offering the depth required for full restoration and ensuring the longevity of this legendary V-twin.

🏷️ Basic Information

Identification

Make:

Harley-Davidson

Model:

FL Knucklehead

Codes

Engine Code Variant:

E (overhead valve, 61 cubic inch), F (overhead valve, 74 cubic inch)

👋 Introduction

Market Position

Positioning:

Essential resource for owners and restorers of historically significant Harley-Davidson motorcycles.

Competitive Analysis

Comparison:

Provides equivalent or superior detail to original factory service manuals, tailored for modern accessibility.

Key Features

Manual Features:

Detailed sub-steps, critical notes/cautions/warnings, numbered instructions, bold figure numbers, detailed illustrations, enlarged insets, numbered table of contents, combined troubleshooting/electrical diagrams.

📋 Manual Details

Coverage Areas

Years Covered:

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

Manual Type

Type:

Full Service Repair Manual

Language

Language:

English

Format

Format:

📖 Manual Coverage

Systems Covered

Engine:

Detailed diagnosis, repair, overhaul, and tuning of Knucklehead OHV engines (E and F series).

Transmission:

Service and repair of the 4-speed constant mesh transmission, including clutch and primary drive.

Electrical System:

Comprehensive coverage of ignition, lighting, charging system, and wiring diagrams.

Fuel System:

Carburetor (Linkert M series) diagnosis, adjustment, and overhaul.

Suspension And Steering:

Front fork (often springer or hydraulic telescopic) and rear suspension servicing; steering head bearing adjustment.

Brakes:

Service and adjustment of drum brake systems.

Frame And Bodywork:

Frame inspection, component mounting, and body panel adjustments.

Procedures Included

Maintenance:

Scheduled maintenance, lubrication, adjustments, and component checks.

Troubleshooting:

Systematic diagnostic procedures for common and uncommon faults.

Repair:

Step-by-step repair instructions for all major components and systems.

Rebuilding Refurbishment:

Detailed procedures for complete engine and transmission rebuilds.

Technical Depth

Depth:

Comprehensive, suitable for professional technicians and experienced DIY mechanics aiming for full restoration.

📊 Manual Specifications

File Format

PDF Quality:

High-resolution, fully printable with searchable text.

Print Quality

Printability:

All pages are printable.

Binding Type

Binding:

Digital Download (PDF) - No physical binding.

Paper Type

Paper Type:

Not applicable (Digital Download).

⚙️ Engine Specifications

Primary Engine

Engine Type:

Air-cooled, four-stroke, V-twin OHV (Knucklehead)

Performance

Engine Displacement E Series:

61 cubic inches (1000cc)

Engine Displacement F Series:

74 cubic inches (1200cc)

Fuel System

Carburetor Type:

Linkert M-series (e.g., M5, M74)

Ignition System

Ignition Type:

Battery and coil ignition with timer, often a distributor-less system for earlier models.

🔧 Transmission

Standard

Transmission Type:

4-speed constant mesh

Optional

Optional Transmissions:

Not applicable for this specific period/model.

Features

Clutch Type:

Dry, multi-plate, foot-clutch operation with hand-lever actuation.

📐 Dimensions

Exterior

Wheelbase:

Approximately 56.5 inches (varies slightly by model year and specific configuration).

Weights

Dry Weight:

Approximately 475-530 lbs (depending on E or F series and specific options).

🛡️ Safety Features

Ratings

Safety Features Era:

Brake performance and tire adhesion were primary safety considerations; minimal active safety features by modern standards.

Active Features

Active Safety:

Drum brakes, mechanical indicators (trafficators) on some models.

Passive Features

Passive Safety:

Robust frame construction, basic rider protection via motorcycle design.

💡 Technology Features

Infotainment

Infotainment Features:

Not applicable. These are classic motorcycles focused on mechanical purity.

Driver Assistance

Driver Assistance Systems:

Not applicable.

Connectivity

Connectivity Features:

Not applicable.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically every 1000-2000 miles or annually, depending on usage and oil type. The manual will provide specific recommendations.

Tune Up Interval:

Recommended every 3000-5000 miles, including spark plug inspection, ignition timing adjustment, and carburetor tuning.

Fluid Specifications

Engine Oil Type:

Typically SAE 50 or 60 weight oil, depending on ambient temperature. Manual will specify exact grades and API classifications.

Transmission Oil Type:

Gear oil, often SAE 90 or higher. Specific viscosity and GL rating will be detailed in the manual.

Primary Chain Case Oil:

Often a mix of primary lubricant and engine oil, or specialized primary fluid. Manual will confirm.

Known Issues

Common Wear Points:

Valve guides, camshaft bushings, mainshaft and countershaft bearings in the transmission, and rocker box gaskets are common areas requiring attention.

Carburetor Issues:

Linkert carburetors can be prone to worn throttle shafts, needle wear, and fuel delivery inconsistencies, requiring careful tuning and rebuilds.

Oil Leaks:

Older Harleys are notorious for minor oil leaks from various seals and gaskets; maintaining proper seal integrity is crucial.

📚 Vehicle History

Brand Heritage

Brand Legacy:

Harley-Davidson's legendary reputation for building powerful, reliable, and iconic American motorcycles.

Model Evolution

Knucklehead Evolution:

The Knucklehead (introduced 1936) was a revolutionary design for Harley-Davidson, featuring distinctive rocker box covers resembling knuckles. It succeeded the Flathead and preceded the Panhead.

Production

Production Years:

1936-1947

Wartime Production:

During World War II, Harley-Davidson produced many motorcycles for military use (e.g., WLA Liberator), with civilian production continuing for essential services and limited domestic sales.

🏆 Awards & Recognition

Recognitions

Historical Significance:

Recognized as one of the most iconic and historically significant American motorcycles, a pinnacle of pre-Panhead Harley-Davidson engineering.

Ratings

Collectibility:

Highly collectible and sought after by vintage motorcycle enthusiasts and collectors worldwide.

Certifications

Original Factory Certification:

The manual is designed to replicate the detail and accuracy of original Harley-Davidson factory service documentation.