Onan MicroLite 4000 Series User Manual

3-3
All clearances are at 70° F (21° C) room temperature. All measurements are listed in inches with
millimeter measurements in parentheses. Measurements are for standard size parts.
FACTORY SPECIFICATION ALLOWABLE
DESCRIPTION MIN. MAX. LIMIT
Intake Valve Seat
Seat Width 0.0433 N/A
(1.1)
Seat Angle 45° N/A
Exhaust Valve
Valve Stem O.D. 0.2732 0.2740 0.2732
(6.940) (6.960) (6.940)
Valve Guide I.D. 0.2756 0.2762 0.2748/0.2768
(7.000) (7.015) (6.98/7.03)
Valve Stem to Guide Clearance 0.0016 0.0030 0.0002/0.0035
(0.04) (0.075) (0.005/0.090)
Valve Stem to Rocker Arm 0.0008 0.0032 0.0008/0.0032
Clearance (Valve Lash) (0.02) (0.08) (0.02/0.08)
Face Angle 45° N/A
Exhaust Valve Seat
Seat Width 0.0433 N/A
(1.1)
Seat Angle 45° N/A
Valve Springs
Free Length 1.8031 1.8228 1.6850
(45.8) (46.3) (42.8)
Distortion (Square) 0.0059
(1.5)
Ignition System Gasoline LPG
Spark Plug Gap 0.025 0.020 0.031/0.043
(0.63) (0.51) (0.8/1.1)
Ignition Timing (BTDC) 25° Not Adjustable

Onan MicroLite 4000 Series Specifications

General

Fuel Type	Gasoline
Frequency	60 Hz
Rated AC Output	4000 Watts
AC Voltage	120V
Rated AC Amperage	33.3A
Engine Type	OHV
Starting Method	Electric
Noise Level	68 dB at 23 ft