1 1

Harley-davidson

Harley Davidson Knucklehead 1940 1941 1942 1943 1944 1945 19

Harley Davidson Knucklehead 1940 1941 1942 1943 1944 1945 19

$16.99
$16.99
Sale Ausverkauft
Versand wird beim Checkout berechnet
Vehicle data plateRef 426069
Brand
Harley-davidson
Vehicle
Motorcycle
Models covered
19, Engines, Harley Davidson, Knucklehead
Years
1940, 1941, 1942, 1943, 1944, 1945
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:
EL "Knucklehead"
Model Code:
EL (for 61 cu in), FL (for 74 cu in)
Years Covered:
1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947
👋 Introduction
Market Position
Historical Significance:
The Knucklehead is a landmark model in Harley-Davidson's history, representing a significant advancement in motorcycle engineering and design for its era.
Collectibility:
Highly collectible motorcycle, making an authentic service manual indispensable for restoration and maintenance.
Competitive Analysis
Competition:
Competed against other American V-twin manufacturers of the period, setting benchmarks in performance and durability.
Key Features
Engine Design:
Overhead valve (OHV) V-twin engine, distinctive 'knuckle-like' rocker box covers giving it its nickname.
Frame Design:
Rigid frame with sprung seat post for rider comfort, a common but refined design for the time.
Engine Sound:
Known for its distinctive, throaty exhaust note.
📋 Manual Details
Coverage Areas
Manual Type:
Service and Repair Manual
Language:
English
Format:
Digital Download (PDF)
Availability:
Instant Download
Digital Access Benefits:
Immediate access, searchable content, ability to print specific sections, and potential cost savings over physical copies.
Page Count
Estimated Page Count:
Likely 200-400 pages, typical for comprehensive service manuals of the era.
📖 Manual Coverage
Systems Covered
Engine Mechanical:
Cylinder heads, cylinders, pistons, connecting rods, crankshaft, camshaft, valve train, lubrication system (oil pump, oil lines), cooling system (air cooling components)
Fuel System:
Carburetor (e.g., Linkert M-series), fuel tank, fuel lines, fuel filter
Ignition System:
Magneto ignition, spark plugs, ignition timing
Transmission:
4-speed constant mesh, clutch operation, gear shifting mechanisms, primary drive (chain and clutch assembly)
Electrical System:
Wiring diagrams, battery, generator, lighting (headlight, taillight, indicators), switches
Suspension:
Front fork (spring fork), rear suspension (rigid frame with sprung seat post)
Braking System:
Front and rear drum brakes, brake linkages, brake shoe adjustment
Chassis And Body:
Frame construction, fenders, fuel tank mounting, seat assembly, handlebars, controls
Frame And Bodywork:
Includes details on frame alignment, fender mounting, and body panel adjustments.
Procedures Included
Maintenance Procedures:
Engine oil changes, lubrication points, chain adjustment, brake adjustments, tire pressure checks, spark plug replacement, filter cleaning/replacement
Repair Procedures:
Engine teardown and assembly, carburetor tuning and rebuilding, transmission overhaul, clutch service, electrical component testing and replacement, brake system repair, fork service
Troubleshooting:
Diagnostic charts for common engine, electrical, and mechanical issues
Disassembly Assembly:
Step-by-step guides with diagrams for component removal and installation
Special Tools:
The manual likely specifies required special tools for certain procedures (e.g., valve spring compressors, clutch alignment tools).
Painting And Finishing:
May include basic guidelines on surface preparation and paint application for original finishes.
Technical Depth
Depth:
Comprehensive: Covers routine maintenance, component-level repair, and complete rebuild procedures.
Diagnostic Capability:
Detailed troubleshooting sections, enabling diagnosis of mechanical and electrical faults.
Diagrams And Illustrations:
Crucial component diagrams, exploded views, and wiring schematics are essential to the manual's utility.
📊 Manual Specifications
File Format
File Type:
PDF
Searchability:
Likely text-searchable if originally digitized from a source with OCR.
Printability:
Printable, allowing for physical copy creation of sections or the entire manual.
Print Quality
Image Resolution:
Dependent on the original source; high-quality scans will yield clear diagrams and photos.
⚙️ Engine Specifications
Primary Engine
Engine Type:
Air-cooled, 45-degree V-twin, OHV (Overhead Valve)
Displacement El:
61 cubic inches (1000 cc)
Displacement Fl:
74 cubic inches (1200 cc)
Performance
Horsepower El:
Approximately 30-35 hp (varied by year and specific tune)
Horsepower Fl:
Approximately 35-40 hp (varied by year and specific tune)
Torque Specs:
Specific torque figures are often found in the manual, essential for proper assembly.
Fuel System
Carburetor Type:
Linkert M-series (e.g., M74, M75)
Fuel Type:
Leaded gasoline (typically 76-80 octane)
Lubrication
Oil Type:
Motor oil, typically SAE 50 or 60
Oil System:
Total loss oiling system with an external oil tank and plunger pump.
🔧 Transmission
Standard
Transmission Type:
4-speed, constant mesh, foot-shifted, hand-clutched
Optional
Features:
Operated via a foot pedal and a hand lever (right side).
Features
Primary Drive:
Duplex chain drive from crankshaft to clutch basket within a primary cover.
Transmission Oil:
Gear oil, often SAE 90
📐 Dimensions
Exterior
Wheelbase:
Approximately 56.5 inches (varies slightly)
Tire Sizes:
Typically 16-inch or 18-inch wheels with specific tire fitments detailed in the manual.
Wheel Bolt Pattern:
Not applicable in the automotive sense; motorcycles use axle nuts.
Weights
Dry Weight:
Around 550-570 lbs (1940 EL)
🛡️ Safety Features
Active Features
Braking System:
Mechanical drum brakes front and rear.
Passive Features
Lighting:
Headlight, taillight, and often basic front and rear position lights/turn signals depending on market regulations.
💡 Technology Features
Infotainment
Features:
No modern infotainment systems. Basic instrumentation typically includes an ammeter and speedometer.
Driver Assistance
Features:
No driver assistance technologies. Focus is on mechanical operation.
Connectivity
Features:
No electronic connectivity features.
🔧 Maintenance
Service Intervals
Engine Oil Change:
Every 1,000-2,000 miles, or as recommended by the manual due to total loss system.
Primary Chain Adjustment:
Regular checks and adjustments, typically every few hundred miles or as slack develops.
Spark Plug Replacement:
Every 2,000-4,000 miles, or as needed.
Fluid Specifications
Engine Oil Viscosity:
SAE 50 or SAE 60
Transmission Oil Viscosity:
SAE 90 Gear Oil
Brake Fluid:
Not applicable, as it uses mechanical actuation, not hydraulic fluid.
Known Issues
Oil Leaks:
Common due to the age and design of seals and gaskets in a total loss system.
Valve Train Noise:
Knuckleheads are known for inherent valve train noise; proper adjustment is key to minimizing it.
Carburetor Tuning:
Linkert carburetors require regular tuning and can be sensitive to adjustments.
📚 Vehicle History
Brand Heritage
Manufacturer:
Harley-Davidson Motor Company, Milwaukee, Wisconsin, USA.
Model Evolution
Predecessor:
WL (45 cu in flathead) and UL (74 cu in flathead) series, but the Knucklehead was a distinct leap with its OHV design.
Successor:
Panhead (introduced 1948)
Production
Production Period:
1936-1947
Impact Of Wwii:
Production shifted to military contracts during WWII, with civilian production resuming post-war. Civilian models for these years were still produced.

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.

Vollständige Details anzeigen
  • Instant download Link on the order page and in your inbox within a minute.
  • Secure checkout Encrypted Shopify payments — card, PayPal, Apple Pay, Google Pay.
  • Print-ready PDF Searchable text; print only the pages you take to the bench.
  • Coverage check Not sure it fits? Send the model and VIN before you buy.