Yanmar EF-494T - Piston Rings; Connecting Rod; Tappet

3 ENGINE 3 ENGINE
EF494T TM 06/2011 edition
115
3.5.14 Piston rings
No.
Inspection item
Standard
Limit
1
Top ring (mm)
Ring groove width
2.060 to 2.075
2.170
Ring width
1.970 to 1.990
1.950
Clearance
0.070 to 0.105
0.200
End gap
0.200 to 0.400
0.490
Second ring (mm)
Ring groove width
2.025 to 2.040
2.140
Ring width
1.970 to 1.990
1.950
Clearance
0.035 to 0.070
0.190
End gap
0.200 to 0.400
0.490
Oil ring (mm)
Ring groove width
4.015 to 4.030
4.130
Ring width
3.970 to 3.990
3.950
Clearance
0.025 to 0.060
0.180
End gap
0.200 to 0.400
0.490
3.5.15 Connecting rod
No.
Inspection item
Standard
Limit
1
Thrust clearance (mm)
0.2 to 0.4
Dimensions of connecting rod small end
No.
Inspection item
Standard
Limit
1
Bushing I. (mm)
26.025 to 26.038
26.068
Pin O.D. (mm)
25.955 to 26.000
25.967
Clearance (mm)
0.025 to 0.043
0.101
3.5.16 Tappet
No.
Inspection item
Standard
Limit
1
Tappet bore I.D. (mm)
12.000 to 12.025
12.045
Stem diameter (mm)
11.975 to 11.990
11.955
Clearance (mm)
0.010 to 0.050
0.090