VALVE AND INJECTOR OPERATING MECHANISM
Three rocker arms are provided for each cylinder (Fig.
The valve and injector operating mechanism is
1); the two outer arms operate the exhaust valves and
lubricated by oil from a longitudinal oil passage on the
the center arm operates the fuel injector.
camshaft side of the cylinder head, which connects with
the main oil gallery in the cylinder block. Oil from this
Each set of three rocker arms pivots on a shaft
passage flows through drilled passages in the rocker
supported by two brackets. A single bolt secures each
shaft bracket bolts to the passages in the rocker arm
bracket to the top of the cylinder head. Removal of the
two bracket bolts permits the rocker arm assembly for
one cylinder to be raised, providing easy access to the
Overflow oil from the rocker arms lubricates the exhaust
fuel injector and the exhaust valve springs.
valves and cam followers. The oil then drains from the
top deck of the cylinder head through oil holes in the
The rocker arms are operated by the camshaft through
cam followers, into the camshaft pockets in the cylinder
cam followers and short push rods extending through
block and back to the oil pan.
the cylinder head.
The cam follower rollers are lubricated with oil from the
Each cam follower operates in a bore in the cylinder
cam followers, oil picked up by the camshaft lobes and
head. A guide for each set of three cam followers is
by oil emitted under pressure from milled slots in the
attached to the bottom of the cylinder head to retain the
cam followers in place and to align the cam follower
rollers with the camshaft lobes.
A coil spring, inside of each cam follower, maintains a
pre-determined load on the cam follower to ensure
contact of the cam roller on the camshaft lobe at all
Fig. 2. Lubrication of Valve Operating Mechanism
Fig. 1. Valve and Injector Operating Mechanism