Detailed service and maintenance guide for Lucas motorcycle generators models E3L, E3LM and E3N.
The manual covers three Lucas motorcycle generator models – E3L, E3LM and E3N – describing their construction, output ratings (60 W for E3L/E3LM, 45 W for E3N) and operating principles. Test data such as cutting‑in speed, output current, field resistance and brush spring tension are listed.
It provides step‑by‑step procedures for routine maintenance, testing, fault diagnosis, disassembly, reassembly and polarity re‑polarisation. Instructions include brush inspection, commutator cleaning, field‑coil checks, bearing replacement and final re‑assembly, with safety notes for positive‑ and negative‑earth systems.
| Output (E3L/E3LM) | 60 W |
|---|---|
| Output (E3N) | 45 W |
| Cutting‑in Speed (E3L/E3LM) | 1050‑1200 rpm at 7 V |
| Cutting‑in Speed (E3N) | 1250‑1500 rpm at 7 V |
| Brush Spring Tension (all models) | 16‑20 oz |
| Field Resistance (E3L/E3LM) | 2.8 Ω |
| Field Coil Current (E3L/E3LM) | ≈2.1 A |
The brush spring tension should be set to 16‑20 oz.
The E3N generator cuts in at 1250‑1500 rpm at 7 V.