Service Manual

Electrical System
Item Standard Specification Limit
Alternator
Nominal Output 12V – 40A
Slip ring O.D. mm (in.) 14.4 (.567) 14.0 (.551)
Rotor coil resistance ohms 2.8 – 3.0
Brush length mm (in.) 10.5 (.413) 4.5 (.177)
Regulated voltage volts at 25 C (77
 F) 14.2 – 14.8
Starter
Type Solenoid shift type
Nominal Output 0.7 kW / 12 Volt
Free running characteristics
Terminal voltage volts 11.5
Current Amps 50 or less
Speed RPM 6,000 or more
Commutator runout mm (in.) 0.05 (.0020) 0.4 (.016)
Commutator diameter mm (in.) 28 (1.10) 27 (1.06)
Undercut depth mm (in.) 0.45 – 0.75 (.008)
(.018 – .030)
Brush length mm (in.) 10 (.39) 4 (.16)
Ignition system
Basic ignition timing at curb idle speed
Distributor
6 +
2 BTDC
Centrifugal timing advance
crank angle/engine speed  / RPM
Initial 0 / 1,600
Middle 10 / 3,000
Final 22 / 6,000
Vacuum characteristics
Crank angle/vacuum  / mm Hg (in. Hg)
Initial 0 / 80 (3.15)
Middle 14 / 150 (5.91)
Final 21 / 250 (9.84)
Ignition coil at 20 C (68
 F)
Primary coil resistance Ohms 1.08 – 1.32
Secondary coil resistance k Ohms 22.1 – 29.9
Spark plug gap mm (in.) 1.0 – 1.1
(.039 – .043)
Liquid Cooled
Gas Engine
Workman 3000/4000 Series Page 3 – 9 Liquid Cooled Gas Engine