User Manual

RENR9968-02 17
Systems Operation Section
Rotocoils (28 ) cause the va lve s to rota te while the
engine is running. Valve rotation provides a longer
service life. Va lve r otation also m inimizes carbon
deposits on the valves.
Adjustable idler ge a r (3 4) is desig ne d to provide the
required gear backlash between nonadjustable idler
gear (35) and camshaft gear (33). If the cylinder
head is removed, tolerances of the components
will change. The components that change are the
cylinder head and the head gasket. The adjustable
idler gear must be relocated. For information on
setting the correct backlash, refer to Testing and
Adjustin g, “Gear Group (Front) - Time”.
The camshaft drive gear has integral pendulums
which act as a vibration damper for the front gear
group. These pendulums are designed to counteract
the torsional forces from the injector pulses. This
eliminates vibration and noise. The engine also runs
smoother at all operating speeds.
i02270230
Lubrication System
SMCS C ode: 1300