Cylinder Block And Cylinder Liner; Crankshaft And Crankshaft Journal Bearing - Kubota EA330-E4 Series Workshop Manual

EA330-E4, WSM

[3] CYLINDER BLOCK AND CYLINDER LINER

[4] CRANKSHAFT AND CRANKSHAFT JOURNAL BEARING

The cylinder block is made of aluminium die-cast.
The cylinder block is provided with oil galleries to
lubricate the crankshaft, main bearing case and rocker
arm bracket. The cylinder liner (1) made of special cast
iron having excellent wear resistance, is press fitted into
the cylinder block.
These engines adopt a wet type cylinder liner which
periphery comes into direct contact with coolant. To
prevent water leakage, O-rings (2) are installed at the
lower part of cylinder liner periphery. To prevent gas
leakage, the upper part of the liner slightly protrudes
from the cylinder block. This is because the gasket at this
part is tightened strongly between the cylinder head and
the liner.
NOTE
• Similarly as the aluminum alloy gear case, etc.
cylinder blocks that are made of aluminum alloy
are prone to scratches and greater thermal
expansion. Therefore, following advises need to
be followed during repair.
• Parts must be tightened when they are cold.
• Follow specified tightening torques accurately.
• Protect processed surfaces, especially, from
scratches.
(1) Cylinder Liner
(2) O-ring
The crankshaft (1) is made of tough special alloy
steel, and the pin and oil seal slinging portions are
induction hardened to increase the hardness for higher
wear resistance.
The journal portions are supported by main bearing
1 (7) and 2 (5).
The crankshaft is provided with an oil gallery which
feeds engine oil to the pin portion and lubricate it.
The oil fed from the oil pump travels along the groove
on the oil filler rings (3), passes through the oil gallery in
the crankshaft and lubricates the crank pin part. The filler
ring is made of aluminum alloy casting.
The oil seal (2) is provided to prevent oil leakage.
(1) Crankshaft
(2) Oil Seal
(3) Oil Filler Ring
(4) Main Bearing Case
1-M6
ENGINE
(3) Cylinder Block
9Y1211018ENM0008US0
(5) Main Bearing 2
(6) Crank Pin Bearing
(7) Main Bearing 1
9Y1211018ENM0009US0
KiSC issued 05, 2015 A