DESCRIPTION & OPERATION
Page 29
On E-Tech™ and E7 engines, the valve yokes
are very similar. However, it extremely critical that
the correct valve yokes are used with the correct
engine. The previous configuration yokes were
identified with the letter “M” or “E” cast into the top
of the yoke next to the slipper pad wear area. The
letter “M” signifies the valve yoke is used in E7
engines, and the letter “E” signifies that the yoke
is used in E-Tech™ engines. On the new “button-
head” style valve yoke, however, the letters “M”
and “E” have been eliminated. Additionally, the
yokes no longer have part numbers stamped on
them. Installation of the correct new button-head
style valve yokes on the correct engine is still
critical. Therefore, a means of positively
differentiating between E-Tech™ and E7 is
provided in the following information and
illustrations.
The most positive means of identification are by
looking at the nose of the valve yoke. The
E-Tech™ yoke has the nose end of the slipper
pad area ground flat as shown in Figure 28.
28
Figure 28 — E-Tech™, E6, E7 and E9 Valve Yokes (Top
View)
A second method of identifying the “button-head”
yoke is to look at the side view. On the yoke used
for the E-Tech™ engine, the top surface of the
adjusting screw end is on the same plane as the
bottom surface of the “button-head.” On the E6,
E7 and E9 valve yokes, the top surface of the
adjusting screw area is 0.145 inch below the
bottom surface of the “button-head.” Refer to
Figure 29 for an illustration of these differences.
29
Figure 29 — Valve Yoke Side View
The yokes used on the E-Tech™ engine have a
deeper engagement at yoke screw end than E7
because of the longer valve (Figure 30). E7 and
E-Tech™ yokes are very similar in appearance,
but should not be interchanged.
30
Figure 30 — Valve Yokes
1. E-Tech™
2. E7
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