81-00-20 Boost Pressure Actuator
81-00-21 Removal of the Boost Pressure Actuator (BPA)
There are actually two different BPA installation versions on the E4 engine.
At the previous version the BPA inlet is connected to the turbocharger (see Fig. 81 – 3).
The BPA inlet of the latest version is connected to the Manifold and therefore the BPA is
installed twisted.
1. Remove the electrical connector [1] “BPA”.
2. Remove the clamps [2] as required.
3. Remove the hoses.
4. Loose the screws [3].
5. Remove the boost pressure actuator [4].
81-00-22 Installation of the Boost Pressure Actuator
In case of installation of the previous BPA versions (for explanations refer to chapter
81-00-21) please follow the steps 1, 3 (routing according to Fig. 81 – 4) 4, 5 and 7 of the
following installation instruction.
In case of installation of the latest BPA version (for explanation refer to chapter 81-00-21)
the following steps need to be followed.
If parts need to be replaced (e.g. bracket or hose) it is always required to install the latest
BPA version.
1. Install the boost pressure actuator [4] using existing screws [3], washers and new
counter nuts and torque them with 3 Nm.
2. Make sure that the spacer [5] is installed on the Manifold according to chapter
85-30-22.
3. Route the hoses according to Fig. 81 - 4.
4. Install hoses and secure them with the clamps [2].
5. Connect electric connector “BPA” [1].
6. If the previous disassembled EPW (according to chapter 81-00-21) was connected to
the Turbo Charger instead to the Manifold make sure that the Turbo Charger outlet is
plugged with a scrub screw [6]. Secure the scrub screw with Loctite 542 and torque
them with 5 Nm.
7. Perform an engine ground run according to Chapter 71-00-03.
Fig. 81 - 3 Previous BPA installation version
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