Positioning:
Essential resource for owners and restorers of historically significant Harley-Davidson motorcycles.
Comparison:
Provides equivalent or superior detail to original factory service manuals, tailored for modern accessibility.
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.
Years Covered:
1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947
Type:
Full Service Repair Manual
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.
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.
Depth:
Comprehensive, suitable for professional technicians and experienced DIY mechanics aiming for full restoration.
Engine Type:
Air-cooled, four-stroke, V-twin OHV (Knucklehead)
Engine Displacement E Series:
61 cubic inches (1000cc)
Engine Displacement F Series:
74 cubic inches (1200cc)
Carburetor Type:
Linkert M-series (e.g., M5, M74)
Ignition Type:
Battery and coil ignition with timer, often a distributor-less system for earlier models.
Safety Features Era:
Brake performance and tire adhesion were primary safety considerations; minimal active safety features by modern standards.
Active Safety:
Drum brakes, mechanical indicators (trafficators) on some models.
Passive Safety:
Robust frame construction, basic rider protection via motorcycle design.
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.
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.
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.
Brand Legacy:
Harley-Davidson's legendary reputation for building powerful, reliable, and iconic American motorcycles.
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 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.
Historical Significance:
Recognized as one of the most iconic and historically significant American motorcycles, a pinnacle of pre-Panhead Harley-Davidson engineering.
Collectibility:
Highly collectible and sought after by vintage motorcycle enthusiasts and collectors worldwide.
Original Factory Certification:
The manual is designed to replicate the detail and accuracy of original Harley-Davidson factory service documentation.
