Service manual for the Avco Lycoming L-649A gear reduction starting motor, covering operation, maintenance, overhaul and bench testing.
This service publication describes the aircraft starting motor with gear reduction drive. It explains the motor's construction, operation principles, wiring, and the required inspection and maintenance procedures. Detailed instructions are provided for removal, disassembly, inspection, lubrication, re‑assembly and bench testing of the motor.
The manual also includes a parts list for the L‑649A series, specifications for voltage loss limits, recommended grease quantities, and test procedures for both the starting motor and associated alternator and voltage regulator units.
| Maximum voltage loss (battery post to motor terminal) | 0.3 V |
|---|---|
| Maximum voltage loss (battery ground to starter frame) | 0.1 V |
| Lubrication grease amount | 1.3–2.9 oz |
| Inspection frequency recommendation | At least twice a year |
The voltage loss must not exceed 0.3 volts.
Inspections should be performed at least twice a year.
Use 1.3 to 2.9 ounces of Lithium Soap‑Base grease (part #1925).