Page 436
REPAIR INSTRUCTIONS, PART 2
4. With the actuator rod extended, remove the
C-clip from the clevis pin, then remove the
pin from the clevis.
5. Set the pressure regulator to 0 psi.
6. With the lever arm clevis resting against the
lower stop, turn the rod end 180 degrees as
follows:
앫 If voltage readings obtained from the
calibration test are high (greater than
4500 mV at 0 percent vane position),
rotate the rod end 180 degrees
clockwise (when viewed from the rod
end of the actuator) to shorten rod
length.
앫 If voltage readings obtained from the
calibration test are low (less than
650 mV at 100 percent vane position),
rotate the rod end 180 degrees
counterclockwise (when viewed from
the rod end of the actuator) to lengthen
rod length.
534
Figure 534 — Rotate Actuator Rod End 180 Degrees
Rotating the rod end 180 degrees will change
voltage approximately 0.025 volt.
At no time and under no circumstances should
the lever stop screws ever be adjusted in an
attempt to adjust actuator rod travel. These stop
screws are factory-adjusted, and changing the
adjustment will result in “over-travel” and possible
jamming of the vanes in one position.
7. Set the pressure regulator to apply
40–60 psi to extend the actuator rod, then
align the hole in the actuator rod end with
the hole in the clevis and install the clevis pin
and C-clip.
8. Adjust the pressure regulator to 0 psi and
ensure that the lever arm moves fully to the
upper stop (vanes fully opened).
9. Adjust the regulator to apply 100 psi and
ensure that the lever arm clevis moves fully
to the lower stop (vanes fully closed).
10. Adjust the regulator to 0 psi, then remove
the regulated air supply from the actuator.
11. While using an open-end wrench on the flats
of the rod end to hold the actuator rod in
place, tighten the rod jam nut to 106 lb-in
(12 N폷m).
12. Reconnect the air line running from the VTG
position control valve to the actuator
assembly. Tighten the line fitting to 140 lb-in
(16 N폷m).
13. Recheck the adjustment by performing the
VTG Vane Position Calibration procedures.
CHECKING ACTUATOR AND VANE
FUNCTION
Actuator and vane function is checked as follows:
1. Verify that air system pressure is at a
minimum of 110 psi and engine coolant
temperature is above 140°F (60°C). If not,
start the engine and run the engine until
coolant temperature is above 140°F (60°C)
and air system pressure builds to the
governor cut-out.
2. With the ignition key switch turned OFF,
connect an air pressure gauge in the air line
between the solenoid control valve and the
vane actuator.
5-111.bk Page 436 Monday, July 10, 2006 2:26 PM
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