Kubota G23, Workshop Manual

Page: 91 / 343

ENGINE
G23, G26, WSM
1-S9 (EU)
[2] G26
ENGINE BODY
Item Factory Specification Allowable Limit
Valve Clearance (Cold) 0.145 to 0.185 mm
0.00571 to 0.00728 in.
–
Compression Pressure
• Differential among Cylinders
3.73 to 4.11 MPa
38.0 to 42.0 kgf/cm
2
541 to 596 psi
–
2.26 MPa
23.0 kgf/cm
2
328 psi
10 % or less
Top Clearance 0.55 to 0.75 mm
0.022 to 0.029 in.
–
Cylinder Head Surface Flatness – 0.05 mm
0.002 in.
Valve Recessing Intake and Exhaust − 0.050 to 0.25 mm
− 0.0020 to 0.0098 in.
0.40 mm
0.016 in.
Valve Stem to Valve Guide
• Valve Stem
• Valve Guide
Clearance
O.D.
I.D.
0.035 to 0.065 mm
0.0014 to 0.0025 in.
6.960 to 6.975 mm
0.2741 to 0.2746 in.
7.010 to 7.025 mm
0.2760 to 0.2765 in.
0.10 mm
0.0039 in.
–
–
Valve Face Angle (Intake) 1.0 rad
60 °
–
Angle (Exhaust) 0.79 rad
45 °
–
Valve Seat Angle (Intake) 1.0 rad
60 °
–
Angle (Exhaust) 0.79 rad
45 °
–
Width 2.12 mm
0.0835 in.
–
Valve Spring Free Length 37.0 to 37.5 mm
1.46 to 1.47 in.
36.5 mm
1.44 in.
Tilt – 1.0 mm
0.039 in.
Setting Load 117.4 N / 31.0 mm
11.97 kgf / 31.0 mm
26.39 lbf / 1.22 in.
100.0 N / 31.0 mm
10.20 kgf / 31.0 mm
22.48 lbf / 1.22 in.
Rocker Arm Shaft to Rocker Arm
• Rocker Arm Shaft
• Rocker Arm
Clearance
O.D.
I.D.
0.016 to 0.045 mm
0.00063 to 0.0017 in.
11.973 to 19.984 mm
0.47138 to 0.47181 in.
12.000 to 12.018 mm
0.47244 to 0.47314 in.
0.10 mm
0.0039 in.
–
–
Push Rod Alignment – 0.25 mm
0.0098 in.
KiSC issued 08, 2009 A