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Harley-davidson

1940-1947 Harley-Davidson Knucklehead Service & Repair

1940-1947 Harley-Davidson Knucklehead Service & Repair

$16.99
$16.99
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Vehicle data plateRef 356586
Brand
Harley-davidson
Vehicle
Motorcycle
Models covered
Engines, Harley Davidson, Knucklehead
Years
1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947
Format
PDF, searchable, print-ready
Delivery
Instant download after checkout
Language
English

What happens after you pay

  • Download link opens on the order page immediately
  • The same link is emailed to you — re-download any time
  • Open on phone, tablet or PC; print only the pages you need
  • Not sure it covers your model year? Ask us before you buy
🏷️ Basic Information
Identification
Make:
Harley-Davidson
Model:
Knucklehead
Production Years Covered:
1940-1947
Codes
Engine Designation:
E, F, FL, EL, U, UL, UH, ULH
👋 Introduction
Market Position
Historical Significance:
The Knucklehead is a cornerstone of Harley-Davidson's vintage motorcycle legacy, representing a significant evolution in their V-twin engine design.
Competitive Analysis
Era Competition:
Competed against other American manufacturers like Indian Motorcycles, setting performance and design benchmarks.
Key Features
Manual Benefit 1:
Provides expert-level guidance for maintaining and restoring these iconic motorcycles.
Manual Benefit 2:
Essential resource for owners, restorers, and mechanics specializing in pre-WWII Harley-Davidsons.
Manual Benefit 3:
Facilitates accurate diagnosis and repair, saving time and preventing costly mistakes.
📋 Manual Details
Coverage Areas
Primary Coverage:
Service and Repair
Secondary Coverage:
Maintenance, Troubleshooting, Overhaul
Page Count
Estimated Page Count:
High (typical for comprehensive factory manuals of the era)
Manual Type
Type:
Service and Repair Manual
Language
Language:
English
Format
Format:
Digital (viewable/printable on desktop, laptop, tablet)
📖 Manual Coverage
Systems Covered
Engine System:
Complete disassembly, assembly, tuning, and troubleshooting of the Knucklehead V-twin engine.
Transmission System:
Service, repair, and adjustment procedures for the 4-speed constant mesh transmission.
Fuel System:
Details on carburetor (e.g., Linkert) disassembly, cleaning, adjustment, and fuel tank service.
Ignition System:
Information on magneto or distributor ignition systems, timing, spark plug specifications, and troubleshooting.
Electrical System:
Wiring diagrams, lighting system service, battery maintenance, and charging system (generator/regulator) procedures.
Suspension System:
Front fork (leading link or springer) and rear suspension (if applicable to specific models) service and adjustment.
Braking System:
Service procedures for drum brakes, including adjustment, lining replacement, and drum servicing.
Frame And Bodywork:
Procedures for frame inspection, fender mounting, fuel tank and oil tank servicing, and general chassis maintenance.
Procedures Included
Maintenance Procedures:
Regular service checks, lubrication points, fluid changes, and component adjustments.
Repair Procedures:
Step-by-step instructions for rebuilding engine components, transmission, and other mechanical systems.
Troubleshooting Guides:
Diagnostic charts and common issue identification for engine performance and electrical faults.
Technical Data Inclusion:
Torque specifications, clearances, timing settings, and electrical resistance values.
Part Identification:
Inclusion of part numbers for critical components, aiding in sourcing replacements.
Technical Depth
Depth:
Comprehensive (covers from routine maintenance to full engine and transmission overhauls).
Diagnostic Capability:
Advanced, with detailed troubleshooting sections for identifying and resolving complex mechanical and electrical issues.
Special Tools:
Likely includes references to specialized Harley-Davidson tools required for specific procedures.
📊 Manual Specifications
File Format
Digital Format:
PDF (typically, offering searchability and print-on-demand capability)
Print Quality
Digital Quality:
High resolution for clear viewing of diagrams and text.
Binding Type
Physical Manual Analogue:
N/A (digital format)
Paper Type
Physical Manual Analogue:
N/A (digital format)
⚙️ Engine Specifications
Primary Engine
Engine Type:
Overhead Valve (OHV) V-Twin
Engine Displacement:
61 cu in (1000cc) for E/F/FL/EL models, 74 cu in (1200cc) for U/UL/UH/ULH models
Bore X Stroke:
E/F/FL/EL: 3.3125 x 3.5 in; U/UL/UH/ULH: 3.4375 x 4.125 in
Performance
Horsepower Estimated:
Approximately 30-40 hp (varies by specific model and tuning)
Torque Estimated:
Significant torque for its era, ideal for cruising.
Fuel System
Carburetor:
Linkert M-series (e.g., M-34, M-35, M-51)
Fuel Type:
Leaded gasoline (typical for the era)
Engine Features
Oil System:
Total Loss oiling system with a separate oil tank and pump.
Cooling System:
Air-cooled
Valve Train:
Pushrod actuated overhead valves, featured distinctive rocker box ('knuckle') design.
🔧 Transmission
Standard
Type:
4-speed constant mesh, foot clutch and hand shift lever (later models).
Optional
Transmission Options:
N/A (4-speed was standard for this generation).
Features
Clutch Type:
Dry plate clutch.
Gear Ratios:
Specific gear ratios are detailed within the manual for optimal performance tuning.
Transmission Fluid:
Refer to manual for specific SAE viscosity, typically heavier weight oils for the era.
📐 Dimensions
Exterior
Wheelbase:
Varies by model, typically around 56-60 inches.
Overall Length:
Varies by model.
Weights
Dry Weight:
Approximately 450-550 lbs (varies significantly by model and equipment).
Gross Vehicle Weight Rating:
Not typically specified in the same way as modern vehicles, but related to load capacity.
🛡️ Safety Features
Ratings
Crash Test Ratings:
N/A (Vehicles of this era were not subjected to standardized crash testing.)
Active Features
Braking System Type:
Drum brakes front and rear.
Passive Features
Lighting:
Headlight, taillight, brake light, and turn signals (where equipped).
💡 Technology Features
Infotainment
Infotainment Systems:
N/A (Basic motorcycle functionality, no infotainment systems).
Driver Assistance
Driver Assistance Features:
N/A (No electronic driver assistance features).
Connectivity
Connectivity Features:
N/A (No electronic connectivity features).
🔧 Maintenance
Service Intervals
Oil Change Interval:
Frequent checks and changes, as per the total-loss system; manual will specify mileage/time.
Tune Up Interval:
Regular intervals for spark plugs, ignition timing, and carburetor adjustment.
Fluid Specifications
Engine Oil:
Manual will specify appropriate viscosity and type (e.g., straight-weight mineral oil).
Transmission Fluid:
Manual will specify type and viscosity for the 4-speed gearbox.
Primary Chain Case Oil:
Manual will specify appropriate lubricant for the primary drive system.
Known Issues
Common Wear Items:
Valve guides, piston rings, clutch components, oil leaks (inherent to design).
Carburetor Issues:
Linkert carburetors can require frequent cleaning and adjustment due to fuel variations and wear.
Electrical System Challenges:
Aging wiring harnesses and generator/regulator systems can be prone to failure.
Part Numbers Availability
Importance Of Part Numbers:
Manual provides critical OEM part numbers for accurate sourcing, essential for vintage restoration.
📚 Vehicle History
Brand Heritage
Harley Davidson Legacy:
Part of Harley-Davidson's foundational era, showcasing their innovation in motorcycle engineering.
Model Evolution
Predecessors:
Followed models like the EL ('Flathead') and OHV V-twins.
Successors:
Evolved into the Panhead (1948 onwards).
Production
Manufacturing Location:
Milwaukee, Wisconsin, USA
Wartime Production:
Production continued through WWII, with some models adapted for military use.
🏆 Awards & Recognition
Recognitions
Model Recognition:
The Knucklehead is universally recognized as a classic and highly desirable motorcycle in the vintage market.
Ratings
Collector Value:
Consistently ranks high in collector value and desirability.
Certifications
Manual Certification:
Not certified, but represents factory-level technical documentation for its intended purpose.

Delivery & file format

This is a digital PDF download, not a printed book. After payment the download link appears on your order confirmation page and is emailed to the address you entered. Files open in any PDF reader on phone, tablet or computer and can be printed.

Check the model year and engine before you buy

Manufacturers change procedures, wiring and part numbers between model years and engine options. If your VIN plate shows a year or engine code that is not listed on the data plate above, contact us with the model, year and VIN and we will confirm coverage before you order.

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