DESCRIPTION & OPERATION
Page 31
Pinless Valve Yokes — Inlet Valve Locations
Beginning on March 2, 2000 (engine serial
No. 0D0120), pinless valve yokes were
implemented into production on all E-Tech™
engines. The pinless yokes are used for the inlet
valve only. This change also affects the cylinder
heads which no longer have yoke guide pins at
the inlet valve locations.
The pinless yoke is self-leveling in operation and
does not have a yoke leveling adjustment screw.
Inlet valve lash adjustments are performed in the
normal manner with the rocker arm adjusting
screw. For the exhaust valves, it is still necessary
to adjust the valve yoke first, then the rocker arm
lash.
The bottom of the valve yoke that bridges the two
inlet valves has a round hole and an elongated
hole that fit over the valve stems. The nose of the
yoke with the elongated hole has two notches in
the casting. When installing the pinless yokes, it
is important that the end of the yoke with the two
notches faces away from the valve rocker shaft. If
the yoke is installed incorrectly, the yoke will
contact the rocker arm.
32
Figure 32 — Proper Assembly of the Pinless Valve Yoke
5_106_00.bk Page 31 Friday, August 4, 2000 11:17 AM
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