Kubota M6800S Workshop Manual page 108

M6800 · M6800S · M8200 · M9000, WSM
Cylinder Head and Tappet (Engine Serial Number :
above YY0471)
1. Loosen the pipe band, and remove the water return pipe (1).
2. Disconnect the fuel pipe (3) first and then the fuel filter (2).
3. Remove the IN. / EX. Manifold.
4. Remove the cylinder head screw in the order of (18) to (1), and
remove the cylinder head.
5. Remove the cylinder head gasket. (O-ring is not attached to
Engine Serial Number : above YY0471, because of metal type
cylinder head gasket.)
6. Remove the tappets (4) from the crank case.
(When reassembling)
• Replace the head gasket with a new one.
• Before installing the tappets (4), apply engine oil thinly around
them.
• When mounting the gasket, set it to the knock pin hole. Take
care not to mount it reversely.
• The cylinder head should be free of scratches and dust.
• Take care for handling the gasket not to damage it.
• Install the cylinder head.
• Tighten the cylinder head screw gradually in the order of (1) to
(18) after applying engine oil.
• Be sure to adjust the valve clearance. See the page 1-S19.
• In the Engine Serial Number : above YY0471, it is not necessary
to retighten the cylinder head screw after running the engine for
30 minutes.
IMPORTANT
• Cylinder Head Gasket between Engine Serial Number :
below YY0470 and above YY0471 are NOT convertible. The
Pistons and Piston Ring Assembly are also NOT convertible
between Engine Serial Number : below YY0470 and above
YY0471.
• When replace the piston, piston pin bush, connecting rod or
crankpin bearing, select the cylinder head gasket thickness
to meet with the top clearance refer to the "Selecting
Cylinder Head Gasket".
NOTE
• Mark the cylinder number to the tappets to prevent
interchanging.
Cylinder head mounting
Tightening torque
screw
(1) Return Pipe
(2) Fuel Filter
(3) Fuel Pipe
(4) Tappets
1-S23
ENGINE
98.1 to 107.9 N·m
10.0 to 11.0 kgf·m
72.3 to 79.6 ft-lbs
A : Gear Case Side
B : Flywheel Side
W1050790
KiSC issued 03, 2008 A