ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 010-113   Variable Geometry Turbocharger Actuator, Pneumatic

Remove the air line from the actuator.

Remove the capscrew holding the actuator rod to the turbocharger cross-shaft.

Remove the snap ring from the cross-shaft.

Loosen the two capscrews holding the actuator to the turbocharger bearing housing.

Use coupling, Part Number 3824843, to apply 414 kPa [60 psi] regulated air pressure to the actuator air inlet to reduce spring load at the linkage.

Remove the two loosened capscrews and actuator.

Inspect the actuator mounting bracket, rod and body. If the actuator is bent or cracked, it must be replaced.

Inspect the bushing in the actuator rod end that attaches to the turbocharger cross-shaft for wear, scoring, or damage. Replace the actuator, if damage is found.

Inspect the outside diameter of the turbocharger cross-shaft pin. Replace the turbocharger if wear is found.

Attach a dial indicator as shown, so the shaft is in line with the actuator rod. Set the dial indicator to zero with no air pressure applied to the actuator.

Connect a clean, regulated air pressure supply and a pressure gauge to the actuator. Apply a minimum of 414 kPa [60 psi] air pressure to make sure the actuator is functioning properly.

The rod must move without any sticking.

NOTE: No air must be heard leaking through a functional actuator.

Spray soapy water on the actuator housing to check for air leaks. Replace the actuator housing if leaks are found.

Replace the actuator if no movement of the actuator rod is detected, the actuator is sticking, or an air leak is found.

NOTE: This test can be performed with the actuator removed or installed on the turbocharger.

Use coupling, Part Number 3824843, to apply 414 kPa [60 psi] regulated air pressure to the actuator.

Install the actuator on the turbocharger bearing housing.

Install and tighten the two capscrews.

Install the actuator rod to the turbocharger cross-shaft.

Install the snap ring.

Install and tighten the capscrew.

• Install the turbocharger actuator air supply line to the actuator. Refer to Procedure 010-118.
• Operate the engine and check for leaks.