Harley-Davidson WLA / 45 Solo 1929–1952 Service & Overhaul Manual

This Harley-Davidson WLA / 45 Solo service and overhaul manual covers engine, drivetrain, electrical, and chassis repair. Its title page limits Servi-Car applicability to the basic drivetrain and describes earlier 45-model coverage as general. Several vehicle-level removal and adjustment procedures refer to the separate TM 9-879, which is not included.

PDF Reading, Printing, and Page Layout

Search, navigation, and legibility: PDF text search and embedded bookmarks are not available. Small labels in the ignition, charging, and lighting diagrams require zooming. A turned page obscures part of the rear-sprocket repair text on printed p. 188 (PDF p. 96).

One printable PDF contains 110 file pages, including one outer-cover page and the title, contents, reference, and index pages. Most file pages display two facing book pages.

Engine Overhaul, Electrical Tests, and Running Gear

The manual’s 15 chapters include the selected repair topics below. Additional sections address saddle-post repair and horn adjustment; this overview is not a complete contents list.

• Engine overhaul: Cylinder and piston removal, valve service, connecting-rod bearing inspection, crankcase disassembly, and reassembly with component-specific fits and tolerances.

• Lubrication: Oil-feed pump and scavenger-pump disassembly, inspection, and assembly, plus rotary-breather timing and diagnosis of oil-return problems.

• Fuel and intake: Linkert M88 carburetor overhaul, float adjustment, throttle and choke inspection, fuel-valve repair, and air-cleaner servicing.

• Ignition and charging: Circuit-breaker repair, generator disassembly, armature and field-coil tests, relay adjustment, and ignition, charging, and lighting wiring diagrams.

• Clutch and transmission: Disk relining, needle-roller fitting, mainshaft and gear end-play adjustment, shifter timing, and clutch-gear oil-seal replacement.

• Brakes, wheels, and steering: Internal-expanding brake repair, wire-spoked wheel truing, hub-bearing service, and spring-fork, rigid-fork, and steering-bearing inspection.

Written for personnel responsible for WLA maintenance and repair, the manual’s overhaul work calls for precision measuring equipment and specialist shop tools.

Engine Bearings, Flywheels, and Oil Circulation

The fits and tolerance tables let you compare measured component wear with repair limits before selecting standard or oversize replacement parts. Step-by-step procedures cover line-reaming timing-gear bushings, truing the flywheel assembly on a truing stand, and checking and straightening bent or twisted connecting rods.

Flywheel assembly instructions address thrust-washer seating and forked-rod side play. The crankpin-bearing fitting section warns that an overly tight fit can cause the bearing to seize and become damaged.

Oil-system diagnosis distinguishes scavenger-pump failure from incorrect rotary-breather timing when investigating exhaust smoke and excessive oil around the exhaust ports.

Always verify clearances and utilize proper shop equipment before starting any engine teardown to prevent component damage or personal injury.

Linkert M88 Carburetor Repair

The Cross Section of Carburetor Float Bowl shows the float-valve arrangement. Repair instructions address carbon-blocked passages, worn throttle and choke shafts, float condition, and float setting.

The high-speed circuit uses a fixed jet; mixture-adjustment coverage centers on the low-speed circuit. Fuel-strainer, supply-valve, intake-manifold, and oil-bath air-cleaner sections extend the coverage beyond the carburetor itself.

Generator Tests and Service/Blackout Lighting

The 6-volt generating-system section distinguishes open, shorted, and grounded armature or field-coil faults. It also covers brush inspection, generator-output regulation, and relay cutout adjustment.

The Ignition Circuit Diagram, Generator to Battery Wiring Diagram, and Lighting System Wiring Diagram identify terminals and wire colors. Service and blackout lighting receive separate circuit descriptions.

Generator repair notes explain how inadequate commutator-mica clearance prevents proper brush contact and causes excessive arcing.

Transmission Assembly and Chassis Repair

The Transmission, Disassembled illustration accompanies bearing, spacer, and shifter-component identification. Inspection guidance connects damaged engagement dogs and gear slots with a transmission that jumps out of gear under load.

Early tapered clutch hubs and later splined hubs receive different removal instructions. Wheel-hub sections distinguish rear roller bearings from front adjustable ball bearings; rear-hub end play can be adjusted without complete hub disassembly.

Chassis coverage includes brake-shoe relining and centering, fork-alignment checks, steering-damper inspection, and frame-alignment assessment. Wheel-lacing guidance relies on comparison with an already-laced wheel rather than a complete illustrated lacing sequence.

Post-overhaul tests address clutch drag and slip, shifting under load, lubrication faults, and abnormal engine or transmission noises.

Bore, Tappet, and Mainshaft Data Preview

Engine inspection data lists a standard cylinder bore of 2.7445–2.7455 inches. For cold-engine valve adjustment, intake-valve tappet clearance is 0.004–0.005 inch.

The transmission section specifies mainshaft end play of 0.003–0.005 inch, with spacer-selection and checking procedures tied to the assembled case and side cover.