Pressure Regulator, Checking/Adjusting
Pressure regulator, checking/adjustingSpecial tools: 999 5544, 999 5646
Manometer
Use test equipment 999 5646 to measure the adjustment 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 position and version of the turbocharger (TC) control valve 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.
Note: When taking readings the manometer must always hang vertically from its hook. This is to ensure that the correct values are obtained. Set the 3-way junction connector handle in its middle position.
Screw out the adjustment 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 displays the value applicable to the relevant engine. See the table.
3-way junction connector has a vent (drilled hole) where it connects to the pressure regulator. This is to facilitate setting the correct pressure.
Checking and adjusting
Push the lever for the boost pressure control (BPC) valve 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.
The diaphragm in the pressure regulator will be damaged if the push rod is twisted.
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.
Quick check, turbocharger (TC)
Stop engine and listen to turbocharger (TC) at the moment of stopping
Normally the rotating turbocharger (TC) components stop moving after the engine.
If this is not the case:
Remove the inlet hose from the compressor housing.
Check afterwards that:
- the compressor wheel spins easily when rotated.
- axial- and radial play feels normal.
- the compressor wheel does not rub in the compressor housing.
Replacing turbocharger (TC)
In a number of cases the turbocharger (TC) has been changed unnecessarily. This happened because some play has been felt when checking (the shaft floats on an oil film).
Play should always be checked before replacing, to determine if the bearings are worn.
The turbocharger (TC) should always be replaced complete:
- plug all terminals on the old turbocharger before it is sent away.