Kubota M5040, Workshop Manual

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1-M7
M5040, M6040, M7040, WSM ENGINE
[7] GEAR TRAIN CONFIGURATION
The 07 series DI engine employs gear train located at
flywheel side. The following benefits are in the rear gear
train configuration.
1. Flexibility of auxiliary parts arrangement.
2. Reduction of gear chattering noise from crankshaft of
torsional and bending vibration.
W1013611
[8] PISTON
Piston’s skirt is coated with molybdenum disulfide
+
,
which reduces the piston slap noise and thus the entire
operating noise.
+
Molybdenum disulfide (MoS
2
)
The molybdenum disulfied serves as a solid lubricant,
like a Graphite or Teflon. This material helps resist metal
wears even with little lube oil.
W1015665
[9] BUILT-IN DYNAMIC BALANCER
Engine are sure to vibrate by piston’s reciprocation.
Theoretically, three-cylinder engines are much less
prone to cause vibration than four-cylinder ones (second
inertia, etc.). However, any engine has many moving
parts in addition to its pistons and cannot be completely
free from vibration.
The four cylinder engine is fitted with balance weight
on crankcase to absorb the second inertia mentioned
above and reduce vibration.
W1013617
(1) Rear Gear Train
(2) Balancer Shaft 1 (3) Balancer Shaft 2
(4) Flywheel
(1) Molybdenum Disulfide
(1) Balancer Shaft 1 (2) Balancer Shaft 2
KiSC issued 06, 2008 A