This comprehensive Harley Davidson Knucklehead 1940-1947 Service Repair Manual provides a wealth of information for technicians, mechanics, and enthusiasts looking to repair, maintain, or simply learn about these iconic motorcycles. The manual contains detailed instructions covering virtually every aspect of the Knucklehead, from the engine and transmission to the brakes, cooling system, steering, suspension, electrical system, and more. It includes detailed diagrams, wiring schematics, and technical specifications for all components. This manual encompasses a wide range of topics, including:

* **Engine**: Disassembly, reassembly, lubrication, timing, valve adjustments, and troubleshooting.
* **Transmission**: Gearbox operation, shifting mechanisms, clutch adjustments, and repair procedures.
* **Brakes**: Drum brake adjustment, replacement, and troubleshooting.
* **Cooling System**: Radiator maintenance, fan operation, and cooling system troubleshooting.
* **Electrical System**: Wiring diagrams, troubleshooting electrical problems, and component replacement.
* **Steering and Suspension**: Front fork adjustments, steering head bearings, and suspension maintenance.
* **Tires and Wheels**: Wheel bearing replacement, tire sizing, and tire maintenance.
* **Other Important Systems**: Fuel system, exhaust system, lighting, and more.

With its detailed instructions and comprehensive coverage, this manual is an invaluable resource for anyone working on a 1940-1947 Harley Davidson Knucklehead. It will help you to understand the intricacies of these machines, perform repairs and maintenance, and keep your Knucklehead running smoothly for years to come.

The Harley-Davidson Knucklehead, a legendary motorcycle produced from 1936 to 1947, is a name synonymous with American motorcycling history. This iconic model, known for its distinctive "knuckle" cylinder heads, marked a significant step forward in motorcycle design and performance. The Knucklehead engine, a 45-cubic-inch (740cc) V-twin, boasted a number of innovations, including a fully enclosed valve train and a redesigned camshaft, contributing to its smooth operation and increased power. The Knucklehead's enduring popularity is attributed to its robust construction, reliable performance, and timeless styling. This machine, famed for its iconic "knuckle" cylinder heads, became a benchmark for American motorcycle engineering. While initially intended as a performance upgrade over the previous Flathead engine, it quickly gained a reputation for its smooth, powerful operation and unparalleled reliability.

The Knucklehead's significance transcends its technical prowess. It became a cultural icon, representing the freedom and adventure associated with motorcycling. Riding a Knucklehead, with its distinctive rumble and sleek lines, was an experience that resonated with the spirit of the times. The iconic "knuckle" cylinder heads, an ingenious design that minimized engine noise and improved performance, became a symbol of the Knucklehead's engineering excellence. The 1940 to 1947 models, while retaining the Knucklehead's core design, introduced subtle refinements and updates, making them even more desirable for enthusiasts. A 1940-1947 Knucklehead Service Repair Manual, therefore, is not just a technical guide; it is a portal to a fascinating era of American motorcycling history. This manual offers a glimpse into the craftsmanship and ingenuity that went into creating these remarkable machines, allowing owners to restore and maintain these iconic motorcycles for generations to come.