Checking Initial Setting Of Boost Pressure Control (BPC) Valve Pressure Servo

PRESSURE REGULATOR, CHECKING/ADJUSTING

Special tools:
999 5544
999 5646

Manometer
Use test equipment 999 5646 to measure the adjusting pressure.





The manometer must always hang vertically when taking readings. This is to ensure that the values obtained are correct.

Removing the heat deflector plate





Remove the heat deflector plate over the Turbocharger (TC). 4 screws.

Removing the hose for the pressure regulator
Remove the hose for the pressure regulator (marked yellow). Disconnect the hose at the Turbocharger (TC) control valve.

Remove the fresh air intake hose from the Air Cleaner (ACL) to access the hose clamp.

Only S70/V70/C70:
The Turbocharger (TC) control valve position and version have been changed on the S70/V70/C70

Disconnect the hose running backward on the Turbocharger (TC) control valve (marked yellow)

Release the push rod





Remove the split pin from the lever.

Release the push rod. Lift the push rod straight up.

Connecting test equipment
Connect:
- manometer 999 5646 to the pressure regulator hose.
- pressure regulator 999 5544 to the manometer.





Screw out the adjusting screw for the pressure regulator completely.

Connect compressed air to the pressure regulator.





Screw in the adjustment screw for the pressure regulator so that the manometer reads the value applicable to the relevant engine, according to the table.

3-way junction connector has a vent (drilled hole) where it connects to the pressure regulator.

Checking and adjusting





Push the Boost Pressure Control (BPC) valve lever towards the Turbocharger (TC) housing.

The Boost Pressure Control (BPC) valve must be closed.

Check that the push rod locates on the lever lug.

If necessary, adjust the push rod until it locates.

Note! The push rod must be mounted on the lever when the lock-nut is adjusted. Twisting the push rod will damage the diaphragm in the pressure regulator.

Reinstall
Install the split pin on the lever.
Tighten the lock-nut on the push rod.
Remove the test equipment.
Connect the hose.
Install the heat shield.
Erase any Diagnostic Trouble Codes (DTCs).
Test drive the car. Accelerate to Wide Open Throttle (WOT) a couple of times.
Then check that no Diagnostic Trouble Codes (DTCs) have been stored.