Kubota B1830, Workshop Manual, Page: 105 / 548

ENGINE B1830,B2230,B2530,B3030, WSM
1-S4
2. SERVICING SPECIFICATIONS
ENGINE BODY
Item Factory Specification Allowable Limit
Valve Clearance (Cold) 0.145 to 0.185 mm
0.0057 to 0.0073 in.
–
Compression Pressure
• Variance Among Cylinders
3.72 to 4.12 MPa
38 to 42 kgf/cm
2
539 to 596 psi
–
2.25 MPa
23.0 kgf/cm
2
327 psi
10 % or less
Top Clearance 0.55 to 0.70 mm
0.0217 to 0.0276 in.
–
Cylinder Head Surface Flatness – 0.05 mm
0.0020 in.
Valve Recessing Intake and Exhaust 0.05 to 0.25 mm
0.0020 to 0.0098 in.
0.40 mm
0.0157 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)
Angle (Exhaust)
1.047 rad
60 °
0.785 rad
45 °
–
–
Valve Guide
(Intake and Exhaust) 7.010 to 7.025 mm
0.2760 to 0.2765 in.
–
Valve Seat Angle (Intake)
Angle (Exhaust)
Width
1.047 rad
60 °
0.785 rad
45 °
2.12 mm
0.0835 in.
–
–
–
Valve Spring Free Length
Tilt
Setting Load
37.0 to 37.5 mm
1.457 to 1.476 in.
–
117.4 N / 31.0 mm
11.97 kgf / 31.0 mm
26.4 lbf / 1.22 in.
36.5 mm
1.437 in.
1.0 mm
0.039 in.
100.0 N / 31.0 mm
10.2 kgf / 31.0 mm
22.5 lbf / 1.22 in.
KiSC issued 05, 2012 A