Volkswagen 4.2l V8 5V Service Training page 17

The roller rocker fingers are mounted on an axle shaft. The axle shaft is used to simultaneously supply the bearings
and the hydraulic valve clearance compensation elements with oil.
- The hydraulic valve clearance compensation elements are located directly in the lever arm above the valves.
- The rollers are each seated between the lever arms.
Exhaust valves
Single cam
Roller seated between
the lever arms
Exhaust valves 1 and 2
Inlet roller rocker finger
tolerance compensation
Minor alignment and component tolerances may
occur between the inlet camshaft cams and the
roller rocker finger rollers.
To guarantee even pressure between the
components, the inlet roller rocker finger axle
shaft is of a convex design.
This prevents the roller rocker fingers
from canting.
The axle shaft's tolerance versus the camshaft is shown in grossly exaggerated form to depict it
more clearly.
Twin roller rocker finger
Axle shaft with
oil supply
Oil spray bore
Inlet valves 1 and 3
S341_032
Shaft axis (actual)
Shaft axis (nominal)
Inlet valves
Double cam
Hydraulic valve clearance
compensation element
Triple roller rocker finger
Oil duct
Inlet valve 2
S341_030
Inlet camshaft
Camshaft axis
Rollers
Axle shaft for
roller rocker fingers
S341_028
Roller rocker fingers
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