Historical Significance:
The 1979 FL represents a pivotal point in Harley-Davidson's evolution, featuring the potent 1340cc (80 cubic inch) Shovelhead engine that became a staple of the big twin lineup.
Target User Base:
Owners and independent repair shops specializing in vintage Harley-Davidson motorcycles.
Practical Utility:
This manual provides the essential information needed to maintain and repair the iconic 1979 Harley-Davidson FL, ensuring its longevity and performance.
Authenticity:
As a factory service manual, it reflects the original manufacturer's intended procedures and specifications, crucial for authentic restoration and repair.
Engine Mechanical:
Complete disassembly, assembly, inspection, and repair of the 1340cc Shovelhead engine, including cylinders, pistons, crankshaft, connecting rods, camshafts, valve train, and oil pump.
Fuel System:
Carburetor (likely a Keihin Butterfly or similar for the era) adjustment, cleaning, and overhaul; fuel tank, fuel lines, and fuel filter maintenance.
Ignition System:
Points and condenser ignition system troubleshooting, adjustment, and component replacement; ignition coil and spark plug specifications.
Transmission:
4-speed constant mesh transmission; removal, disassembly, assembly, inspection, and adjustment of gears, shafts, bearings, and shift mechanisms.
Drivetrain:
Primary drive (chain or belt, depending on specific FL sub-model), clutch operation and adjustment, final drive (belt or chain) inspection and maintenance.
Braking System:
Front and rear brake system service, including hydraulic fluid replacement, caliper maintenance, brake pad/shoe inspection and replacement, and drum brake adjustment.
Suspension System:
Front fork (likely FL style leading-link or telescopic) overhaul and fluid changes; rear shock absorber maintenance and replacement; swingarm bearing service.
Electrical System:
Wiring diagrams, troubleshooting of lighting, charging system (generator or alternator), starter motor, battery, and all switches and controls.
Frame And Bodywork:
Frame inspection, maintenance of body panels, fenders, fuel tank, seat, and handlebars.
Maintenance:
Routine maintenance procedures such as oil changes, filter replacements, chain lubrication, brake adjustments, and tune-ups.
Troubleshooting:
Diagnostic procedures for common problems, with symptom-based troubleshooting guides.
Repair:
Detailed step-by-step repair instructions for virtually all components of the motorcycle.
Disassembly Assembly:
Comprehensive guides for taking apart and putting back together all major mechanical and electrical systems.
Specifications:
Torque specifications for all fasteners, clearances, tolerances, fluid capacities, and other critical measurements.
Depth Of Coverage:
Comprehensive, covering everything from basic maintenance to complete engine rebuilds and electrical system diagnostics.
Diagnostic Capabilities:
Detailed troubleshooting charts and procedures to identify and resolve issues.
Component Rebuilds:
In-depth instructions for overhauling key components like the engine, transmission, and carburetor.
Digital Format Availability:
Typically available as a scanned PDF, but the original product is a printed book.
Paper Quality:
Original factory manuals are typically printed on durable, semi-gloss paper suitable for workshop environments.
Binding:
Likely a saddle-stitched or perfect-bound paperback.
Diagrams And Photos:
Contains detailed line drawings, exploded views, and possibly some black and white photographs to illustrate procedures and components.
Engine Type:
Air-cooled, 45-degree V-twin, OHV (Overhead Valve)
Displacement:
1339.8 cc (81.7 cubic inches)
Bore X Stroke:
Approx. 3.44 in x 4.25 in (87.3 mm x 108 mm) - specific factory specs would be in the manual.
Horsepower:
Estimated 60-70 HP (at crank, depending on tuning and specific model variant).
Torque:
Estimated 75-85 ft-lbs (at crank).
Carburetor:
Likely Keihin Butterfly or S&S Super E/B (check manual for exact OEM fitment).
Oil System:
Dry Sump lubrication with oil tank typically mounted in the frame backbone.
Engine Oil Change:
Typically every 1,000-2,000 miles or annually, depending on usage and oil type. Manual will specify precise interval and procedure.
Transmission Oil Change:
Recommended at similar intervals to engine oil, or as specified in the manual.
Primary Chain Tension:
Regular checks and adjustments are critical for primary chain longevity.
Engine Oil:
Typically a high-quality V-twin specific oil, often with a high zinc content (ZDDP) for older flat-tappet camshafts. Specific viscosity (e.g., 20W50) and type (mineral or synthetic) will be detailed in the manual. Harley-Davidson approved oils like HD 360 or equivalent.
Transmission Oil:
Gear oil, specific viscosity and type (e.g., SAE 80W-90 or similar) will be listed. Harley-Davidson's Formula+ transmission oil is a common modern replacement.
Primary Chain Case Oil:
Often shares oil with the transmission, or uses a specific primary oil. Manual will clarify.
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid (check manual for specific DOT requirement).
Shovelhead Engine Quirks:
Potential for oil leaks (common on vintage Harleys), valve guide wear, and the need for regular ignition timing adjustments. The crankpin runout can also be a critical inspection point.
Transmission Wear:
Wear in the shift drum and pawl mechanism can lead to shifting issues. Proper lubrication is key.
Electrical System:
Aging wiring harnesses can become brittle, leading to intermittent electrical faults. Charging system output (generator/alternator) should be monitored.
Harley Davidson Legacy:
Harley-Davidson, founded in 1903, is an iconic American motorcycle manufacturer with a rich history of producing large-displacement V-twin motorcycles.
Fl Model Lineage:
The FL designation has historically represented Harley-Davidson's large touring motorcycles, evolving from the Panhead era into the Shovelhead era by 1979.
Production Years Shovelhead:
Shovelhead engines were produced from 1966 to 1984, with the 1340cc version being prominent in the later years, including 1979.
