Cub Cadet 8404 - Manual (Page 32)

CHAPTER 2 8354/8404
2-10 D615-W02 May-2003
615W218A
615W217A
615W216A
(1) Valve Spring Collet (4) Valve Stem Seal
(2) Valve Spring Retainer (5) Exhaust Valve
(3) Valve Spring (6) Inlet Valve
I. INLET AND EXHAUST VALVES
The valve and its guide of the inlet are different from
those for the exhaust. Other parts, such as the spring,
spring retainers, valve spring collets, valve stem seals
are the same for both the inlet and the exhaust. All
contact or sliding surfaces are hardened to increase
wear resistance.
J. TIMING GEARS
The crankshaft drives the oil pump and the idle gear
engaged fuel camshaft and camshaft. The timings for
opening and closing the valves is extremely important
to achieve effective air inlet and sufficient gas exhaust.
The appropriate timing can be obtained by aligning the
mark on the crankshaft gear (6) with one the idle gear
(5), idle gear with camshaft gear, idle gear with injec-
tion pump gear, when assembling.
(1) Injection Pump Gear (5) Idle Gear
(2) Fuel Camshaft (6) Crankshaft Gear
(3) Camshaft Gear (7) Crankshaft
(4) Camshaft
K. FLYWHEEL
The flywheel is installed on the rear end of the
crankshaft. Its inertia keeps the flywheel turning at a
constant speed, while the crankshaft tends to speed
up during the power stroke and to slow down during
other stokes. The flywheel has a ring gear (1), which
mesh with the drive pinion of the starter. The flywheel
has also marks “TC” and “FI” on its outer rim. The mark
TC shows the piston’s top dead center and the mark FI
shows the fuel injection timing, when they are aligned
with the mark of window on the clutch housing.
(1) Ring Gear (3) Crankshaft
(2) Flywheel