Base Engine Operation
03
120
3
RG,RG34710,1518 –19–09SEP02–3/3
The camshaft turns in the head on four replaceable
bushings. The camshaft directly actuates the rocker
arms for the valves and the rocker arm for the
electronic unit injectors. Rocker arms rotate on a
two-piece rocker arm shaft (O). The rocker arms for
cylinders 1, 2, and 3 rotate on one half of the two
piece shaft; the rocker arms for cylinders 4, 5, and 6
rotate on the other half. Rollers built in to each rocker
arm ride on the camshaft lobes.
The electronic unit injector rocker arm directly actuates
an injector for each cylinder. The injectors are located
so that they spray fuel directly into the center of the
cylinder. The injectors deliver fuel at a much higher
pressure (approximately 23,200 psi) than what is
achievable with an in-line or rotary injection pump.
The valve rocker arms push on a short push rod. The
push rod actuates a bridge that will then operate two
valves.
Four valves per cylinder increases engine air flow
compared to using one large intake and one large
exhaust valve. The intake valves for each cylinder are
located towards the front of engine. The exhaust
valves are located towards the rear. The intake valves
and exhaust valves are the same size. The difference
between the two can be determined by the fact that
the intake valves are all magnetic. The head of the
exhaust valves are a stellite alloy and are not
magnetic.
CTM100 (06APR04)
03-120-3
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=335
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