Basic Setting, Boost Pressure Regulator

Basic setting, boost pressure regulator

The pressure regulator's diaphragm unit is adjusted at the factory and should only be adjusted in connection with a repair, replacement of components or fault diagnosis. After adjustment, the basic boost pressure should always be checked. See "Checking basic boost pressure on the road". Testing and Inspection

WARNING:
When adjusting the length of the pushrod, the pliers used for adjustment should grip the rod as close to the threads as possible. Turn the end piece carefully so that burrs do not arise on the pushrod. Burrs can cause the diaphragm unit to bind and so upset the system's boost pressure control.
Adjustment should always be carried out with the pushrod disconnected from the actuator arm.

Tool: Adjusting pliers 13 94 066.

Diaphragm unit and boost pressure regulator mounted on the turbocharger:




1 Undo the end piece locking nut.

2 Break the seal, remove the locking ring and de tach the pushrod from the actuator arm.

3 Move the actuator arm on the flap valve towards the "Closed" position. Adjust the end piece on the push rod so that it can easily be fitted on the stud of the actuator arm.

4 Screw in the end piece 3.5 turns on the pushrod (3 mm prestressing). Tighten the locknut.

5 Carefully withdraw the pushrod and fit it on the stud. Fit the circlip.

6 Check boost pressure by driving the car on the road and taking readings. Checking Basic Boost Pressure on the Road

7 Seal the push rod.