User Manual

Page 6-58
200 ENGINE ASSEMBLY
All E7 production engines starting with serial
No. 2X0000 and above, feature valve lifters with
no hole as well as inlet and nonbrake push rods
with 0.060 inch (1.524 mm) maximum flat or
dimple on the push rod ball end.
Installation
Used push rods have established wear patterns.
Push rods being returned to service should be
installed in the same position from which they
were removed.
1. Apply lubricating oil to spherical end of the
push rod and insert it into the lifter opening.
Ensure that it has engaged the lifter by lifting
it slightly. If the lifter has been properly
contacted, some resistance will be felt in the
rod as the lifter is raised.
2. Repeat step 1 until all 12 push rods are in
position.
[213 NV] VALVE YOKES
Description
There are two exhaust valves and two inlet valves
for each cylinder. Each rocker arm, in conjunction
with the valve yoke, operates both valves
together, in a set (exhaust or inlet), per cylinder.
Installation
Used yokes have established wear patterns.
Yokes being returned to service should be
installed in the same position from which they
were removed.
Refer to Figure 6-68.
1. Lubricate the yoke guide pins (5) with clean
engine oil.
If the engine is equipped with a Jake Brake, the
exhaust valve yokes will have a larger rocker arm
contact surface. The yokes with the larger
surface must be installed on pins corresponding
with the Jake Brake actuators.
2. Place the valve yokes (2) on the yoke guide
pins from which they were removed. Slightly
rock the yokes from side to side to be sure
they are seated on the valve stems (4).
Engines equipped with Jake Brake: Effective
January 1994 (engine serial No. 401269), the
E7 Jake Brake yoke was manufactured with
metric threads utilizing the Spiralock™ thread
form. Refer to Section 7, SETUP AND
ADJUSTMENTS, under Valve Yoke, Valve Lash
and Slave Piston Adjustments (with Jake Brake)
for details regarding correct method to loosen the
yoke adjusting screw.
Figure 6-68 — Valve Yoke
1. Rocker arm
2. Valve yoke
3. Yoke adjusting screw
4. Jam nut
5. Valve stem
6. Yoke guide pin
5-101.bk Page 58 Friday, March 17, 2006 11:05 AM