PLATE 4416131 - Caterpillar

Illustration 1 g03501396
(1) Actuator
(2) Armature
(3) Set screw
(4) Jam nut
(5) Butterfly valve
Illustration 2 g03501676
(2) Armature
(6) Tamper resistant lock wire
Work carefully around an engine that is running. Engine parts that are hot, or parts that are moving, can cause personal injury.
Preferred Method of Adjustment is at Rated Load
Load the engine to 100% rated load and speed in order to establish an air intake manifold pressure. Note: The target air intake manifold pressure at rated load is 280 +/- 2.5 kPa.
If the target air intake manifold pressure is not met, loosen the jam nut and adjust the set screw. This action will adjust the gap between the set screw and the armature. Refer to Table 1 for the adjustment guide.
After the adjustment is completed, tighten the jam nut to 47 9 N m (34.7 6.6 lb ft). Note: Make equal adjustments to both set screws.
Install a new lock wire and tamper resistant band.
Table 1
Air Intake Manifold Pressure at Rated Load Set Screw Adjustment
260 kPa (37.7 psi) 4 turns clockwise
270 kPa (39.2 psi) 2 turns clockwise
280 2.5 kPa (40.6 0.36 psi) Target
290 kPa (42.1 psi) 1 turn counter clockwise
300 kPa (43.5 psi) 1 and 1/2 turns counter clockwise Procedure for when Rated Load Cannot be Applied
Measure the gap between the set screw and the armature on the valve that is being replaced.
On the new part, loosen the jam nut and adjust the set screw to create the measured gap.
After the adjustment is completed, tighten the jam nut to 47 9 N m (34.7 6.6 lb ft). Note: Make equal adjustments to both set screws.
Install a new lock wire and tamper resistant band. Procedure for when Rated Load Cannot be Applied and the Part Being Replaced has been Discarded.
Table 2
Rating Gap
5600 bkW 5.4 0.5 mm (0.213 0.020 inch)
5730 bkW 9.4 0.5 mm (0.370 0.020 inch)
With the engine off, verify the gap between the set screw and the armature is the correct gap. Refer to Table 2 for the correct gap for the engine rating.
On the new part, loosen the jam nut and adjust the set screw to create the correct gap.
After the adjustment is completed, tighten the jam nut to 47 9 N m (34.7 6.6 lb ft).
Install a new lock wire and tamper resistant band.
Verify that the bypass valves on both turbochargers have the same set screw gap.