1958-1959 Harley-Davidson Duo-Glide 74 OHV & Servi-Car Service Manual (140 P.)
Factory service documentation for 74 OHV Duo-Glide and Servi-Car models — complete procedures for clutch assembly, transmission repair, and ignition timing. Part No. 99482-59
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Sample pages from the 1958-1959 Harley-Davidson Duo-Glide 74 OHV & Servi-Car Service Manual (140 P.) manual
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Models Covered & Key Technical Specifications
Harley-Davidson Duo-Glide 74 OHV, FL, FLH — 1958–1959 Certified Documentary Specification Section.
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Authorized Amperage Specs: 58.5 HP at 5,400 RPM is set to the maximum rated horsepower for the FLH engine configuration Mapping.
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Critical Thermal Envelope: For optimal combustion, 1,207 cc (73.66 cu. in.) piston displacement reaches the standard engine cylinder volume Configuration.
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Operational Production Rate: The bore and stroke dimensions measure 87.3 mm (3-7/16 in.) by 100.8 mm (3-31/32 in.) and is standardized to the mechanical engineering tolerances Benchmarks.
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Fundamental Imaging Specs: Compression ratio corresponds to 8:1 on FL models and 7.25:1 for optimal fuel combustion Range.
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Specific Fluid Capacity: The fuel tank yields 3-3/4 gallons (14.2 L) of total storage capacity Sequences.
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Core Output Rating: Maximum torque is established at 65 lb-ft at 3,200 RPM for the FLH model configuration Baseline.
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Applied Technical Manual: Motorcycle Official Service Manual: Harley-Davidson Duo-Glide 74 OHV & Servi-Car Motorcycle (1958-1959) Service-Dossier
Operational-Scope: Duo-Glide 74 OHV, Servi-Car, FL, FLH models (1958–1959) // Technical-Scope: Engine and transmission systems, chassis and electrical subsystems Logic // Operational-Scope: Comprehensive factory documentation spanning 140 pages of service procedures and component specifications.
| Category | Content | Documentation |
|---|---|---|
| Engine Systems | Cylinder head, crankcase, gearcase, fuel system, lubrication | Complete specifications provided |
| Transmission | Clutch, gear box, shifter mechanisms, starter assembly | Detailed procedures documented |
| Chassis | Brakes, wheels, forks, frame, drivetrain chains | Reference data included |
Outlining the operational framework across engine disassembly and transmission repair, the manual references crankcase and gearcase overhaul, documents valve and rocker arm service, incorporates cylinder and piston refinishing, and addresses generator and ignition timing. Covering electrical system troubleshooting, wiring configuration, spark plug heat ranges, and battery maintenance procedures, the service guide provides comprehensive technical information for both routine adjustment and major component restoration across the Duo-Glide and Servi-Car motorcycle lineup.
Steering component information is provided for fork assembly, disassembly, and slider bushing replacement using factory-specified tools and techniques. Inspection guidelines are provided for wheel hub bearings, brake system components, and electrical connections to verify serviceability and proper clearance tolerances. Alignment specifications are included for chain adjustment procedures, clutch control rod positioning, and shifter mechanism timing to ensure correct engagement of transmission components. Reference data is included for oil pump pressure ranges, bearing roller sizing, and valve spring compression testing to support accurate diagnosis during engine overhaul operations. This manual covers lubrication system design, oil circulation pathways through the engine, crankcase breather function, and documented torque specifications for the engine mounting bolts to ensure proper assembly.
The document documents torque specifications for fastener assembly to ensure proper pressure slip prevention.
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