OPERATION
The camshaft has precisely machined (egg shaped)
lobes to provide accurate valve timing and duration.
The camshaft is driven by the crankshaft via drive
sprockets and chains.
ROCKER ARMS
DESCRIPTION
The rocker arms are composed of steel stampings
with an integral roller bearing (Fig. 9). The rocker
arms incorporate a 0.5 mm (0.0197 in.) oil hole in the
lash adjuster socket for roller/camshaft lobe lubrica-
tion (Fig. 9).
OPERATION
The rocker arm is the pivot point between the cam-
shaft lobe and the valve.
Fig. 8 Valvetrain Components
1 – CAMSHAFT BEARING CAP-INTAKE
2 – CAMSHAFT BEARING CAP-EXHAUST
3 – CAMSHAFT-EXHAUST
4 – ROCKER ARM
5 – HYDRAULIC LIFTER
6 – CYLINDER HEAD
7 – CAMSHAFT (SECONDARY) CHAIN TENSIONER
8 – CYLINDER BLOCK
9 – CYLINDER HEAD
10 – CAMSHAFT-INTAKE
11 – CAMSHAFT (SECONDARY) TIMING CHAIN
Fig. 9 Rocker Arm
1 – LASH ADJUSTER POCKET
2 – OIL SQUIRT HOLE
3 – ROLLER
9 - 8 2.7L ENGINE LH
DESCRIPTION AND OPERATION (Continued)
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