Nanni N4.40, Workshop Manual, Page: 160 / 175

ENGINE
03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM
1-S90
Piston Ring Gap
1. Put the piston ring into the lower part of the liner (the least worn
out part) with the piston.
2. Measure the ring gap with a feeler gauge.
3. If the ring gap is more than the allowable limit, replace the ring.
M00000003ENS0134US1
Top ring
Factory
spec.
D1503-M,
V2003-M,
V2403-M-T,
D1803-M-DI,
V2403-M-DI,
V2403-M-DI-T,
V2003-M-BG,
V2003-M-T-BG
0.20 to 0.35 mm
0.0079 to 0.013 in.
D1703-M,
D1803-M,
V2203-M,
V2403-M,
D1703-M-BG,
V2203-M-BG,
V2403-M-BG
0.25 to 0.40 mm
0.0099 to 0.015 in.
Allowable limit
1.25 mm
0.0492 in.
Second ring
Factory
spec.
D1503-M,
D1703-M,
D1803-M,
V2203-M,
V2403-M,
D1803-M-DI,
V2403-M-DI,
D1703-M-BG,
V2003-M-BG,
V2203-M-BG,
V2403-M-BG
0.30 to 0.45 mm
0.012 to 0.017 in.
V2003-M,
V2403-M-T,
V2403-M-DI-T,
V2003-M-T-BG
0.40 to 0.55 mm
0.016 to 0.021 in.
Allowable limit
1.25 mm
0.0492 in.
Oil ring
Factory
spec.
D1503-M,
D1703-M,
D1803-M,
V2003-M,
V2203-M,
V2403-M,
V2403-M-T,
V2403-M-DI-T,
D1703-M-BG,
V2003-M-BG,
V2003-M-T-BG,
V2203-M-BG,
V2403-M-BG
0.25 to 0.45 mm
0.0099 to 0.017 in.
D1803-M-DI,
V2403-M-DI 0.20 to 0.40 mm
0.0079 to 0.015 in.
Allowable limit
1.25 mm
0.0492 in.
KiSC issued 06, 2009 A