Kubota ZD18 User Manual

1-S11
ZD18(F) · ZD21(F) · ZD28(F), WSM
ENGINE
3. SERVICING SPECIFICATIONS
[D1105-E-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 ZD18 Specifications

General

Horsepower	18 hp
Transmission	Hydrostatic
Cutting Width	48 inches
Drive	2WD
Engine Type	Diesel
Cutting Height Range	4 inches