Harley-Davidson WLA Service Manual 1929–1952 (P/N TM 9-879)

• Original 110-page OEM publication (P/N unlisted) covering 1929–1952 Harley-Davidson WLA and Solo 45 models, plus 1941 and later Servi-Car variants
• In-depth overhaul data for the 45 cubic inch (750 cc) side-valve L-head V-twin engine and drivetrain architecture
• 15 chapters of service protocols featuring 128 labeled technical illustrations
• Comprehensive fits, tolerances, and electrical system tables
• Provides troubleshooting parameters for the three-speed transmission, multiple dry-disk clutch, and 6-volt generating system
• Details service steps for the scavenger pump, rotary breather valve, wire-spoked wheels, internal expanding brakes, and spring fork

Engine and Drivetrain Documentation

This PDF literature breaks down the complete teardown and overhaul process for the classic 45-inch V-twin. You get a clear look at the internal mechanics, from cylinder and piston assembly removal to connecting rod bearing inspections and critical flywheel alignment. The book does not stop at the block. It covers the entire fuel and intake system, including detailed breakdowns of the Linkert M88 carburetor. You will also find comprehensive sections detailing ignition timing, electrical generating systems, and essential chassis maintenance. For mechanics looking to avoid exorbitant specialist fees, this manual provides highly specific step-by-step procedures for complex tasks like line-reaming timing gear bushings, truing the flywheel assembly on a truing stand, and straightening bent connecting rods. Visual references are crucial for these procedures. This guide includes comprehensive wiring diagrams, along with a generator to battery wiring diagram, an ignition circuit diagram, and a lighting system wiring diagram. You will also find a cross section of the carburetor float bowl and an exploded drawing of the disassembled transmission. Working on vintage motorcycle internals requires strict adherence to factory procedures. Always verify clearances and utilize proper shop equipment before starting any engine teardown to prevent component damage or personal injury.

Precision Data and Technical Specifications

This reference delivers the exact tolerance charts, valve clearance settings, and torque specs required for a proper rebuild. For example, standard cylinder bore is defined precisely at 2.7445 to 2.7455 inches. It specifies intake valve clearance (engine cold) at 0.004 to 0.005 inches, while drivetrain tables mandate mainshaft end play between 0.003 and 0.005 inches. Having these exact factory numbers on your workbench equips you to accurately gauge component wear and successfully rehabilitate obsolete assemblies, providing a tangible advantage for your daily shop routine. Understanding specific mechanical traps separates a reliable motor from a catastrophic failure. For instance, failing to completely undercut the generator's commutator mica to a 0.025-inch depth will prevent the brushes from seating properly, leading to severe arcing and rapid electrical failure. Furthermore, if you neglect to verify that the female connecting rod side play is between 0.006 and 0.010 inches before the final flywheel truing, you risk pinched roller bearings and a seized lower end. Keep in mind, this product page serves strictly as a table of contents and overview of the publication, not a how-to repair guide.