Cylinder Head Servicing; Top Clearance; Cylinder Head Surface Flatness - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service
[3]SERVICING
(1) Cylinder Head

Top Clearance

1. Remove the cylinder head (remove the cylinder head gasket
completely).
2. Bring the piston to its top dead center fasten 1.5 mm dia. 5 to 7
mm long fuse wires to 3 to 4 spots on the piston top with grease
so as to avoid the intake and exhaust valves and the combustion
chamber ports.
3. Bring the piston to its middle position, install the cylinder head,
and tighten the cylinder head screws to specification. (Head
gasket must be changed to new one).
4. Turn the crank shaft until the piston exceeds its top dead center.
5. Remove the cylinder head, and measure squeezed fuse wires
for thickness.
6. If the measurement is not within the specified value, check the
oil clearance of the crankpin journal and the piston pin.
Top clearance Factory spec.
Cylinder head mounting
Tightening torque
screw
(1) Fuse

Cylinder Head Surface Flatness

1. Clean the cylinder head surface.
2. Place a straightedge on the cylinder head's four sides (A), (B),
(C) and (D) and two diagonal (E) and (F) as shown in the figure.
Measure the clearance with a feeler gauge.
3. If the measurement exceeds the allowable limit, correct it with a
surface grinder.
IMPORTANT
• Be sure to check the valve recessing after correcting.
Cylinder head surface
Allowable limit
flatness
III-S-146
Engine
0.72 to 0.90 mm
0.0283 to 0.0354 in.
98.1 to 107.9 N·m
10.0 to 11.0 kgf·m
72.3 to 79.6 ft-lbs
W1049122
0.05 mm
0.0020 in.
W1061323