Kubota GL6000A-AU-B Workshop Manual page 75

GL6000A-AU-B, GL6000D-AU-B,GL9000A-AU-B, GL9000D-AU-B, WSM
Top Clearance
1. Remove the cylinder head. (Do not attempt to remove the
cylinder head gasket.).
2. Move the piston up, and plastigauges (1) [1.5 mm dia. (0.059 in.
dia.), 5.0 to 7.0 mm long (0.20 to 0.27 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 its top dead center.
5. Remove the cylinder head, and measure the width of the
crushed plastigauges (2) with the scale (3).
6. If the measurement is not within the factory specification, 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.
Top clearance Factory specification
Tightening torque Cylinder head screw
(1) Plastigauge
(2) Crushed Plastigauge
1-S13
ENGINE
0.50 to 0.70 mm
0.020 to 0.027 in.
38 to 42 N·m
3.8 to 4.3 kgf·m
28 to 31 lbf·ft
(3) Scale
9Y1211607ENS0009US0
KiSC issued 06, 2016 A