Piston; Built-In Dynamic Balancer (Balancer Model Only) - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service

[5] PISTON

[6] BUILT-IN DYNAMIC BALANCER (BALANCER MODEL ONLY)

V3 series DI engine has two intake valves and two
exhaust valves per each cylinder.
The rocker arm (1) contacts a bridge arm (2) instead
of the valves stem tip.
The bridge arm then contacts both intake valves or
bath exhaust valves and causes two valves to open
simultaneously.
(1) Rocker Arm
Piston's skirt
disulfide<Dingbats>H, which reduces the piston slap
noise and thus the entire operating noise.
Molybdenum disulfide (MoS
The molybdenum disulfied serves as a solid
lubricant, like a Graphite or Teflon. This material helps
resist metal wears even with little lube oil.
(1) Molybdenum Disulfide
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.
III-S-76
(2) Bridge Arm
W1014724
is coated with molybdenum
)
2
W1015665
W1013617
Engine