Austro Engine E4 Series - 4. Boost Pressure Actuator (BPA)

E4 Series
Maintenance Manual
Turbocharging
Page 204
E4.08.04
Rev. 29
81- Maintenance Procedures
01-Jul-2020
4. Boost Pressure Actuator (BPA)
A. Remove the BPA
Detail Steps/Work Items
Key Items/References
(1)
Remove the electrical connector BPA.
Refer to Fig. 81 - 9.
(2)
Remove the clamps from the hose to the BPA.
(3)
Remove the hoses.
(4)
Loosen the screws that attach the BPA to the
bracket on the cylinder head cover.
(5)
Remove BPA.
B. Install the BPA
There are two different BPA installation configurations on the E4 engine:
 Configuration 1: the BPA inlet is connected to the turbocharger. Refer to
Fig. 81 - 8.
 Configuration 2: the BPA inlet is connected to the manifold and thus the BPA is
installed twisted. Refer to Fig. 81 - 9.
For Configuration 1: do the steps (1), (4), (5), (6) and (9).
For Configuration 2: do all the following steps.
If you replace parts (e.g. bracket or hose), install the BPA Configuration 2.
Detail Steps/Work Items
Key Items/References
(1)
Install the BPA.
Refer to Fig. 81 - 9.
(2)
Tighten the screws at the bracket with washers and
new counter nuts.
Torque 3 Nm.
Refer to Fig. 81 - 9.
(3)
Make sure that the spacer is installed on the
manifold.
Refer to Section 85-30-00
Paragraph 2.
(4)
Do the hoses routing.
Refer to Fig. 81 - 9.
For the installation direction of
the restrictor and the hose
clamps position, refer to Fig. 81
- 10.
(5)
Install the hoses and the restrictor and attach the
clamps.
(6)
Connect the electrical connector BPA.
(7)
If the initial BPA was installed with configuration 1
(BPA connected to the turbocharger), make sure
that the turbocharger outlet is plugged with a set
screw.
Refer to Fig. 81 - 11.
(8)
Secure the set screw with Loctite 542.
Torque 5 Nm.