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Kubota WSM ZD331 User Manual

Kubota WSM ZD331
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1-S52
ZD321, ZD326, ZD331, WSM
ENGINE
[4] SERVICING
(1) Cylinder Head and Valves
Top Clearance
1. Remove the cylinder head. (Do not attempt to remove the
cylinder head gasket.)
2. Move the piston up and stick a strip of fuse [1.5 mm dia. (0.059
in. dia.), 5 to 7 mm long (0.197 to 0.276 in. long)] on the piston
head at three positions with grease so as to avoid the intake and
exhaust valves and the combustion chamber ports.
3. Lower the piston, and install the cylinder head and tighten the
cylinder head screws to the specified torque.
4. Turn the flywheel until the piston exceeds top dead center.
5. Remove the cylinder head, and measure the thickness of the
squeezed fuses.
6. If the measurement is not within the factory specifications, check
the oil clearance between the crankpin and crankpin bearing and
between the piston pin and small end bushing.
NOTE
After checking the top clearance, be sure to assemble the
cylinder head with a new cylinder head gasket.
[D782-E2-ZD]
[D1005-E2-ZD, D1305-E3-ZD]
[D782-E2-ZD]
[D1005-E2-ZD, D1305-E3-ZD]
W1020190
Top clearance Factory spec.
0.50 to 0.70 mm
0.020 to 0.027 in.
Top clearance Factory spec.
0.80 to 1.00 mm
0.032 to 0.0393 in.
Tightening torque Cylinder head screw
38 to 42 N·m
3.8 to 4.3 kgf·m
28 to 31 lbf·ft
Tightening torque Cylinder head screws
64 to 68 N·m
6.5 to 7.0 kgf·m
47 to 50 lbf·ft
(1) Fuse (2) Fuse
KiSC issued 04, 2007 A

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Kubota WSM ZD331 Specifications

General IconGeneral
TransmissionHydrostatic
Fuel TypeDiesel
Cylinders3
Engine TypeDiesel
Cutting Width72 inches
PTOIndependent
TypeZero-Turn Mower
Displacement68.5 cu in
Drive2WD
Turning RadiusZero

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