85-70-40 Coolant Thermostat
85-70-41 Removal of the Coolant Thermostat
1. Drain the coolant - refer to the applicable Aircraft Maintenance Manual.
2. Remove the coolant hoses attached to the coolant thermostat - refer to the applicable
Aircraft Maintenance Manual.
3. Remove the screws [1].
4. Remove the thermostat [2].
85-70-42 Installation of the Coolant Thermostat
1. Install new O-ring.
2. Take care for the proper fit of the O-ring.
3. Attach the coolant hoses to the coolant thermostat - refer to the applicable Aircraft
Maintenance Manual.
4. Clean the connecting surface of the manifold if necessary.
5. Lubricate O-ring with acid free lubrication.
6. Install the thermostat (inspect correct position of the O-ring).
7. Ensure that the thermostat is fitted properly (see Fig. 85 - 93) and without any
preload to the manifold.
8. Install the screws [1] with the clamp of the wiring harness and torque with 12 Nm.
If engine harness E4A-95-000-000, or E4B-95-000-000 is used the clamp of the wiring
harness is not needed!
9. Fill in coolant and bleed system – refer to the applicable Aircraft Maintenance Manual.
10. Clear the working area.
11. Perform an engine ground run according to Chapter 71-00-03.
12. After the ground run inspect coolant system for leakage.
For coolant information please refer to Chapter 05-20-17 Coolant
Fig. 85 - 122 Fig. 85 - 123
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