wsm wg972-e4 - Inlet and Exhaust Valves; Flywheel; Closed Breather

ENGINE
WG972-E4, WSM
1-M5
[10] INLET AND EXHAUST VALVES
The valve and its guide for the inlet are different from
those for the exhaust.
Other parts, such as the spring (4), spring retainer
(3), collet (2), stem seal (5), and cap (1) are the same for
both the inlet and exhaust.
9Y1211108ENM0012US0
[11] FLYWHEEL
The flywheel (1) is connected with the crankshaft, it
stores the rotating force in the combustion stroke as
inertial energy to rotate the crankshaft smoothly.
The flywheel periphery is provided with marks
showing fuel injection timing and top dead center.
The flywheel has ring gear teeth around its outer rim,
which mesh with the drive pinion of the starter.
Also, a rotor is attached to the flywheel and the rotor
(2) has some holes. Some of these holes are different
form from the other ones.
Crank position sensor is sensing piston position and
engine speed by different form holes of rotor and
determines the injection timing.
9Y1211108ENM0013US0
[12] CLOSED BREATHER
Blow-by gas (a) and (c) from crankcase is removed
oil in the breather assembly (3) and sent to forward and
backward of the electronic throttle body (2) where the
blow-by gas (a) and (c) is mixed with the intake air (b).
9Y1211108ENM0014US0
(1) Valve Cap
(2) Collet
(3) Spring Retainer
(4) Spring
(5) Stem Seal
(6) Valve Guide
(7) Inlet Valve
(8) Exhaust Valve
(1) Flywheel (2) Rotor
(1) Inlet manifold
(2) Electronic Throttle Body
(3) Gas Mixer
(4) Breather Tube
(5) Breather Assembly
(a) Blow-by Gas at Throttle
close
(b) Intake Air
(c) Blow-by Gas at Throttle
open
KiSC issued 07, 2015 A