Cylinder Head
After replacement of the engine cylinder head, the proper
bolt torquing sequence must be followed. (fig. C578)
Torque the bolts in 3 separate steps, increasing tightness
to the specified 93.1 ~ 98 Nm (68.7 ~ 72.3 ft / lbs)
Apply oil to the threads of the bolt and to the heads of the
bolt where they contact the cylinder head casting.
Always install a new head gasket and oil gallery O- ring
when replacing the cylinder head.
After installation, operate the engine for half an hour to
bring to full operating temperature. Allow the engine to
fully cool and retorque the cylinder head bolts.
7-14
C179
C578
Compression Testing (cont’d)
If the compression test reading are low, add a small
amount of oil, through the injector hole, to the affected
cylinder (s). Recheck the compression test readings. If the
readings improve from the first test then the piston rings
or cylinder bores are likely worn.
If the compression reading does not improve the problem
is likely a cylinder head related problem such as valve
train, cylinder head gasket, or a bad piston. The cylinder
head should be removed for further inspection. See the
Kubota Service / Repair Manual P / N 97897-109-5 or
Thomas P / N 40916.
Cylinder head bolt torque sequence
Gear case end Flywheel end
CYLINDER HEAD 7.2
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