ENGINE
EA330-E4, WSM
1-M8
[7] TIMING GEAR
The timing gears consisting of the crank gear (2),
cam gear (1), idle gear (6), (7) and balancer gears (4),
(5) serve to correctly control the intake and exhaust
valves opening, closing timing, fuel injection timing and
balance movement, etc.
Respective gears are marked with alignment marks
to assure correct relative positioning of gears when
assembling. For these timing gears, helical gears are
used. They smoothly convey rotations with less noise.
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[8] CAMSHAFT
The camshaft is made of carbon steel forging and its
cam and journal faces are induction hardened.
The oval-shaped cam improves intake efficiency and
at the same time reduces noise.
On the camshaft, the cam gear (3) is installed.
The camshaft is provided with an intake and exhaust
cam to actuate the intake and exhaust valves. In
addition, a groove is machined at the tip of the camshaft
to drive the trochoid pump for lubrication.
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[9] FLYWHEEL
The flywheel stores the rotating force in the
combustion stroke as inertial energy, reduces crankshaft
rotating speed fluctuation and maintains the smooth
rotating conditions.
On the circumference of the flywheel are stamped
the top dead center "T" mark and four lines indicating
every 0.03 rad (2 °) of crank angle from 0.35 rad (20 °) to
0.49 rad (28 °) before mark "T".
On the NB type, ring gears are press-fitted into the
periphery inside the flywheel to allow the engine to be
started withe a starter.
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(1) Cam Gear
(2) Crank Gear
(3) Balancer Gear 2
(4) Balancer Gear 3
(5) Balancer Gear 1
(6) Idle Gear (45T)
(7) Idle Gear (21T)
(1) Camshaft
(2) Camshaft Stopper
(3) Cam Gear
(1) Fuel Injection Timing Line
(2) Fan Cover Mark
(3) T.D.C. Mark "T"
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