M-3
V3300-E2B, V3300-T-E2B, WSM
DIESEL ENGINE
[3] CYLINDER HEAD
This engine employs three valve system - two inlet
valves and double ports, and one exhaust valve which
produce good inlet inertia to improve combustion
efficiency and volumetric efficiency. It also employs
Kubota’s unique combustion chamber with multiple
injection grooves.
Besides the conventional cross port system, it
employs the forced cooling method between valves to
eliminate heat distortion, thus enabling durable and
reliable configuration.
W1013336
[4] PISTON AND PISTON RINGS
This engine employs the E-TVCS VERSION-II so that
the improved combustion surface at the top of piston
enables more complete combustion efficiency than the
conventional models.
The profile and the offset of piston are optimized to
reduce slapping noises. The oil jet at the small end of the
connecting rod reduces heat load of the piston.
Three rings are installed in grooves in the piston. The
top ring (1) is made of nitrizing steel to get more reliability
than the chrome plated ring. It is a keystone type ring to
get durability against heavy load. At the sliding part, a
special piston ring which is conformable to the cylinder
wall is employed. The second ring is chromeplated on
the peripheral surface and it is an undercut ring to
prevent shortage of oil.
The oil ring (3) has chamfered contact faces and an
expander ring, which increase the pressure of the oil ring
against the cylinder wall.
Several grooves are cut on the topland to help heat
dissipate and to prevent scuffing.
W1013501
(1) Top Ring
(2) Second Ring
(3) Oil Ring
(4) Depression
(5) Valve Recess
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