Nanni N4.40, Workshop Manual

Page: 161 / 175

ENGINE
03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM
1-S91
Clearance between Piston Ring and Groove
1. Clean the rings and the ring grooves, and install each ring in its
groove.
2. Measure the clearance between the ring and the groove with a
feeler gauge or depth gauge.
3. If the clearance is more than the allowable limit, replace the
piston ring.
4. If the clearance stays more than the allowable limit with new
ring, replace the piston also.
M00000003ENS0135US1
Top ring
Factory
spec. D1803-M-DI,
V2403-M-DI 0.050 to 0.090 mm
0.0020 to 0.0035 in.
Allowable limit
0.20 mm
0.0079 in.
Second ring
Factory
spec.
D1503-M,
D1703-M,
D1803-M,
V2003-M,
V2203-M,
V2403-M,
V2403-M-T,
V2403-M-ID-T,
D1703-M-BG,
V2003-M-BG,
V2003-M-T-BG,
V2203-M-BG,
V2403-M-BG
0.0930 to 0.128 mm
0.00367 to 0.00503 in.
D1803-M-DI,
V2403-M-DI 0.0780 to 0.110 mm
0.00307 to 0.00433 in.
Allowable limit
0.20 mm
0.0079 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
0.020 to 0.060 mm
0.00079 to 0.0023 in.
D1803-M-DI,
V2403-M-DI 0.030 to 0.070 mm
0.0012 to 0.0027 in.
Allowable limit
0.15 mm
0.0059 in.
(A) D1503-M, D1703-M, D1803-M,
V2003-M, V2203-M, V2403-M,
V2403-M-T, D1703-M-BG,
V2003-M-BG, V2003-M-T-BG,
V2203-M-BG, V2403-M-BG
(B) D1803-M-DI, V2403-M-DI,
V2403-M-DI-T
KiSC issued 06, 2009 A