Low Pressure-Vacuum Diaphragm, Adjusting: Procedure
Follow all the rules of cleanliness.
-- Remove the engine cover. Refer to ENGINE COVER, REMOVING AND INSTALLING .
-- Secure the :VW387 with the catalytic converter nut -arrow-.
-- Secure the :VAS6341/1 with a :VAS6341/4 on the :VW387 .
-- Align the dial gauge with the vacuum diaphragm actuator rod.
-- Adjust the dial gauge 20 to 25 mm pretension.
-- :VAS6213 and :VAS6342 to the vacuum diaphragm -arrow- and to connection "II" on the :VAG1397A , as illustrated.
-- Connect the :VAS6342 .
- The lever -1- is horizontal.
-- Set the :VAS6213 slide ring in the "vacuum" position.
-- Switch the :VAG1397A and set the slide switch to position "II".
-- Check dial gauge for ease of movement.
-- Operate the :VAS6213 until the :VAG1397A shows the following value:
- 580 ± 5 mbar (8.4 ±.07 psi).
The :VAG1397A cannot display values over 580 mbar (8.4 psi).
-- Set dial gauge to "0".
-- Note the measured value.
-- Lower the vacuum via the Pressure Control Valve:VAS6342 .
- 440 mbar (6.4 psi)
If the vacuum was reduced too much, raise the vacuum back to 580 mbar (8.4 psi) and adjust again by reducing it.
- The actuator rod must have moved opposite the previously measured value 0.8 to 1.2 mm in the direction of the dial gauge.
-- Lower the vacuum via the :VAS6342 .
- 100 mbar (1.4 psi)
- The actuator rod must have moved opposite the previously measured value 7 to 9.5 mm in the direction of the dial gauge.
-- If the specified value is not reached open the lock nut -1-.
-- Remove the lock washer -3- and remove the actuator rod -2- from the mounting pins.
-- Extend or shorten the front part of the actuator rod by turning left or right.
-- Install the actuator rod -2- on the mounting pins.
-- Repeat the test with the :VAS6213 and the :VAS6341/1 .
-- If the specified value is now reached, install the lock washer and tighten the lock nut.