Cylinder Head; Crankshaft - Kubota WG972-E2 Workshop Manual

WG972-E2, DF972-E2, WSM

[3] CYLINDER HEAD

[4] CRANKSHAFT

■ Intake and Exhaust Port
The cross-flow type intake / exhaust ports, which
lower the heat conduction from the exhaust port to the
intake port. The low heat conduction keeps the intake air
from being heated and expanded by the exhaust gas.
(1) Intake Port
■ Combustion System
The Spark lgnition type combustion chamber,
compactly placed on top of the piston head, successfully
reduces emissions. To ensure even more reliable
emission life, the intake / exhaust valve seats are fitted
with special heat resistant stellite alloys.
(1) Valve
(2) Valve Seat
(3) Main Combustion Chamber
The crankshaft with the connecting rod converts the
reciprocating motion of the piston into rotating motion.
The crankshaft (2) has oil passages drilled so that oil can
flow from the main bearings to the crank pin bearings.
The front journal is supported by a sleeve type
bearing (crankshaft bearing 1) (1), the intermediate
journal by a split type (crankshaft bearing 3) (4), and the
rear by a split type (crankshaft bearing 2) (6) with thrust
bearings (5).
(1) Crankshaft Bearing 1
(2) Crankshaft
(3) Feather Key
M-3
GASOLINE / LPG ENGINE
(2) Exhaust Port
W1013336
(4) Piston
(5) Spark Plug
W11094950
(4) Crankshaft Bearing 3
(5) Thrust Bearing
(6) Crankshaft Bearing 2
W1014724
KiSC issued 01, 2006 A