Page 58
DESCRIPTION AND OPERATION
ROCKER ARM AND SHAFT ASSEMBLY
Rocker Arm Improvements Effective January
2002
Effective with the January 2002 introduction of
the spring-loaded push rods, both inlet and
exhaust both inlet and exhaust rocker arms have
been revised to provide pressure oil feed to the
valve adjusting screws. A vertical groove has
been added to the inboard side of the adjusting
screw bore, from the top of the bore to the oil
supply hole that is just above the bottom of the
bore. On the outboard side of the rocker arm
adjusting screw boss, a closure plug has been
installed into the drilled hole to eliminate the leak
path for pressure oil and ensure sufficient oil to
the adjusting screw.
64
Figure 64 — Rocker Arm Effective January 2002
Further rocker arm improvements include
adjusting screws that have a groove around the
center of the screw, an oil passage cross-drilled
through the shank of the screw and an oil
passage drilled along the vertical center line of
the screw. These oil passages provide lubrication
to the ball end of the adjusting screw and the
push rod cup. Additionally, to make it easier to
hold the screw during valve adjustment, the new
rocker arm adjusting screws have a 5 mm internal
hex rather than a screwdriver slot as was used on
previous adjusting screws.
65
Figure 65 — Rocker Arm and Adjusting Screw with Oil
Passages (Introduced January 2002)
1. Plug
2. Rocker Arm (Top View)
3. Rocker Arm (Side View)
4. Hardened Pin
1. Oil Supply Groove
2. Drilled Oil Passage
3. Oil Supply Groove
4. Outboard Oil Hole
Plugged
5. Drilled Oil Hole Plugged
5-111.bk Page 58 Monday, July 10, 2006 2:26 PM
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