Onan MicroLite 4000 Series User Manual

10-14
Piston Skirt O.D. Measurement:
1. Measure the piston skirt O.D. with an outside
micrometer (Figure 10-25).
2. If the measurement is less than the allowable
limit, replace the piston.
Piston Boss I.D.:
1. Measure the piston boss I.D. in both the vertical
and horizontal direction with a cylinder gauge
(Figure 10-26).
2. If the measurement exceeds the allowable lim-
it, replace the piston.
Piston Ring Gap:
1. Insert piston ring into cylinder. Use piston head
to push ring down to bottom of cylinder.
2. Measure the ring gap with a feeler gauge as
shown in Figure 10-27.
3. If the ring gap exceeds the allowable limit, re-
place the ring.
FIGURE 10-25. PISTON SKIRT MEASUREMENT
FIGURE 10-26. PISTON BOSS I.D.
CT1123s
FIGURE 10-27. MEASURING RING GAP

Onan MicroLite 4000 Series Specifications

General

Brand	Onan
Model	MicroLite 4000 Series
Category	Portable Generator
Language	English