Yanmar EF-494T - Timing Gear Backlash; Cylinder Block; Crankshaft; Thrust Bearing

3 ENGINE 3 ENGINE
EF494T TM 06/2011 edition
114
3.5.9 Timing gear backlash
No.
Inspection item
Standard
Limit
1
Crank gear, cam gear, idle gear, fuel injection pump gear,
PTO gear (mm)
0.07 to 0.15
0.17
3.5.10 Cylinder block
No.
Inspection item
Standard
Limit
1
Cylinder I.D. (mm)
88.000 to 88.030
88.200
2
Cylinder bore
Circularity (mm)
0.01 maximum
0.030
Taper (mm)
3.5.11 Crankshaft
No.
Inspection item
Standard
Limit
1
Bend (1/2 the dial gauge reading) (mm)
―
0.02
2
Clamp pin (mm)
O.D.
47.925 to 47.962
47.902
Bearing I.D.
48.000 to 48.026
―
Bearing insert thickness
1.492 to 1.500
Clearance
0.038 to 0.074
0.150
3
Journal (mm)
Selective
combination
O.D.
53.952 to 53.962
53.902
Bearing I.D.
54.000 to 54.020
Bearing insert thickness
1.995 to 1.990
Clearance
0.038 to 0.068
0.150
3.5.12 Thrust bearing
No.
Inspection item
Standard
Limit
1
Crankshaft end play (mm)
0.13 to 0.23
0.28
3.5.13 Piston
No.
Inspection item
Standard
Limit
1
Piston O.D.
(Measure at 90° to the piston pin) (mm)
87.940 to 87.970
87.895
2
Piston O.D. measuring point
(Upward from the bottom of the piston) (mm)
24
―
3
Piston pin (mm)
Hole I.D.
26.000 to 26.009
26.039
Pin O.D.
25.995 to 26.000
25.965
Clearance
0.000 to 0.014
0.074