Kubota GR1600EC2 Workshop Manual page 90

GR1600EC2, WSM
Cylinder Head
1. Loosen the pipe clamp, and remove the water return pipe.
2. Remove the cylinder head screw in the order of (j) to (a).
3. Lift up the cylinder head to detach.
4. Remove the cylinder head gasket and O-ring (1).
(When reassembling)
• Replace the cylinder head gasket with a new one.
• Securely fit the O-ring (1) to the pipe pin.
• Tighten the cylinder head screws after applying sufficient oil.
• Tighten the cylinder head screws diagonal sequence starting
from the centre.
• Tighten them uniformly, or the head may deform in the long run.
• Retighten the cylinder head screws after running the engine for
30 minutes.
Tightening torque Cylinder head screw
(j) to (a) : To Loosen
(a) to (j) : To Tighten
Tappets
1. Remove the tappets (1) 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.
(1) Tappet
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 seal 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
• Do not change the combination of valve and valve guide.
(1) Valve Spring Replacer
(2) Valve Cap
(3) Valve Spring Collet
(4) Valve Spring Retainer
1-S23
ENGINE
37.3 to 42.2 N·m
3.8 to 4.3 kgf·m
27.5 to 31.1 ft-lbs
(1) O-ring
W1045977
W10209700
(5) Valve Spring
(6) Valve Stem Seal
(7) Valve
W10211070
KiSC issued 07, 2006 A