85-70-23 Removal of the Water Pump Bearing Housing Assembly
12. Drain the coolant - refer to the applicable Aircraft Maintenance Manual.
13. Remove the coolant pipe - refer to the applicable Aircraft Maintenance Manual.
14. Remove the v-ribbed belt - refer to Chapter 85-40-11.
15. Disconnect the M6 screws [6].
16. Remove the belt pulley [5] from the water pump bearing housing assembly [2].
17. Disconnect the M6 screws [1].
18. Remove the water pump bearing housing assembly [2] and the profile gasket [3].
Discard the profile gasket. Discard the water pump bearing housing assembly in case of
leakage.
Conduct an inspection of the sealing surface of the water pump housing [4] for mechanical
damages (scratches, dents, cracks, etc.). If the sealing surface shows any damage, the
water pump housing must also be replaced – for disassembly/assembly refer to Chapter 85-
70-21 and 85-70-22.
19. Clean the sealing surface of the water pump housing.
85-70-24 Installation of the Water Pump Bearing Housing Assembly
20. Lubricate the profile gasket [3] with acid free lubrication.
Only use a new profile gasket.
21. Place the profile gasket into the designated notch of the water pump bearing housing
assembly [2].
22. Bring water pump bearing housing assembly in position.
Inspect the profile gasket for correct installation.
23. Fix the water pump bearing housing assembly with M6 screws [1] and torque the
screws across with 13 Nm.
24. Mount the belt pulley [5] on the flange of the water pump bearing housing [4] with
M6 screws [6] and torque the screws with 13 Nm.
25. Install the coolant pipe - refer to the applicable Aircraft Maintenance Manual.
26. Install the v-ribbed belt - refer to Chapter 85-40-12.
27. Fill and bleed the cooling system - refer to the applicable Aircraft Maintenance
Manual.
28. Clean the working area.
29. Perform an engine ground run according to Chapter 71-00-03.
30. After the ground run inspect coolant system for leakage.
For coolant information please refer to Chapter 05-20-17
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