Kubota WSM STa-30, Workshop Manual

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1-S24
ST
α
-30 · ST
α
-35, WSM ENGINE
Cylinder Head
1. Loosen the pipe clamp, and remove the water return pipe (1).
2. Remove the cylinder head screw in the order of (n) to (a).
3. Lift up the cylinder head to detach.
4. Remove the cylinder head gasket.
(When reassembling)
• Replace the cylinder head gasket with a new on.
• Tighten the cylinder head screws after applying sufficient oil.
• Tighten the cylinder head screws in diagonal sequence starting
from the center.
• Tighten them uniformly, or the head may deform in the long run.
W1021755
Tappets
1. Remove the tappets from the crankcase.
(When reassembling)
• Visually check the contact between tappets and cams for proper
rotation. If defect is found, replace tappets.
• Before installing the tappets, apply engine oil thinly around them.
IMPORTANT
■
• Do not change the combination of tappet and tappet guide.
W1022001
Valves
1. Remove the valve caps (2).
2. Remove the valve spring collet (3), pushing the valve spring
retainer (4) by valve spring replacer (1).
3. Remove the valve spring retainer (4), valve spring (5) and valve
stem seal (6).
4. Remove the valve (7).
(When reassembling)
• Wash the valve stem and valve guide hole, and apply engine oil
sufficiently.
• After installing the valve spring collets, lightly tap the stem to
assure proper fit with a plastic hammer.
IMPORTANT
■
• Don’t change the combination of valve and valve guide.
W1022102
Tightening torque Cylinder head screw
93.1 to 98.0 N·m
9.5 to 10.0 kgf·m
68.7 to 72.3 ft-lbs
(1) Return Pipe (n) to (a): To Loosen
(a) to (n): To Tighten
(A) Gear Case Side
(B) Flywheel Side
(1) Valve Spring Replacer
(2) Valve Cap
(3) Valve Spring Collet
(4) Valve Spring Retainer (5) Valve Spring
(6) Valve Stem Seal
(7) Valve
KiSC issued 11, 2006 A