15 - Engine
42 - Rocker and Fittings
00 - General
15 - 158 9823/0000-1 15 - 158
Operation
When the camshaft lobe raises the outside of the
rocker arm, the inside presses down on the valve
stem to open the valve. When the outside of the
rocker arm is permitted to return due to the camshafts
rotation, the inside rises to allow the valve spring to
close the valve.
Figure 201.
1 Oil feed from main gallery 2 Small transfer gallery
3 Shaft pedestal 4 Rocker shaft fixing bolt hole
5 Centre rocker shaft drilling 6 Cross drillings
7 Rocker pivot bushes 8 Cross drilling
9 Groove
Lubrication
Oil is fed from the main gallery via a drilling which
passes up through the crankcase and the cylinder
head to a small transfer gallery under the rocker
shaft pedestal. The oversize rocker shaft fixing bolt
hole allows oil to pass into a drilling in the centre of
the rocker shaft. Further cross drillings transfer oil
to each of the rocker pivot bushes. A cross drilling
in each rocker transfers oil to the top of the rocker
where it flows by gravity along a groove to the rocker
tip.
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