Kubota WSM User Manual

1-S5
ZD25F, WSM
ENGINE
2. SERVICING SPECIFICATIONS
[D1005-E2-ZD]
[1] ENGINE BODY
W1015702
Item Factory Specification Allowable Limit
Cylinder Head Surface Flatness – 0.05 mm
0.0020 in.
Top Clearance 0.55 to 0.70 mm
0.0217 to 0.0276 in.
–
Compression Pressure (When Cranking with Starting Motor)
Variance among Cylinders
2.84 to 3.24 MPa
29 to 33 kgf/cm
2
412 to 469 psi
–
2.26 MPa
23 kgf/cm
2
327 psi
10 % or less
Valve Clearance (Cold) 0.145 to 0.185 mm
0.0057 to 0.0072 in.
–
Valve Seat Width 2.12 mm
0.0835 in.
–
Valve Seat Angle (Intake)
Angle (Exhaust)
1.047 rad
60°
0.785 rad
45°
–
–
Valve Face Angle (Intake)
Angle (Exhaust)
1.047 rad
60°
0.785 rad
45°
–
–
Valve Recessing – 0.05 to 0.15 mm
– 0.0020 to 0.0059 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 0.0026 in.
6.960 to 6.975 mm
0.2740 to 0.2746 in.
7.010 to 7.025 mm
0.27599 to 0.27657 in.
0.10 mm
0.0039 in.
–
–
Valve Timing (Intake Valve) Open
Close
0.24 rad (14°)
before T.D.C.
0.52 rad (30°)
after B.D.C.
–
–
Valve Timing (Exhaust Valve) Open
Close
0.96 rad (55°)
before B.D.C.
0.24 rad (14°)
after T.D.C.
–
–
KiSC issued 04, 2009 A

Kubota WSM Specifications

General

Brand	Kubota
Model	WSM
Category	Lawn Mower
Language	English