Replace Engine Thermostats

CAUTION: Shut off the engine. Only remove the expansion tank cap when cool enough to touch with bare hands. To relieve the pressure, slowly loosen the expansion tank cap to the first stop before removing completely.

IMPORTANT: Replace the thermostat and expansion tank cap whenever the coolant is changed.

NOTE: Replace the thermostat after draining the coolant during coolant change. (See Change the Engine Coolant in this section.)

1. Park machine and shut off the engine.

2. Remove the ignition key from the key switch.

3. Access the engine compartment. (See Access to Engine Compartment in Access to Service Points section.)

4. Replace the expansion tank cap.

5. Loosen the hose clamp (B).

   
   T6642EK-UN-01NOV88

   
   BM010495-UN-12NOV15

   Thermostat Housing

   
   BM011233-UN-24NOV16

   A - Screws

   B - Hose Clamp

   C - Hose

   D - Thermostat Cover

   E - Seal

   F - Thermostat

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6. Pull the hose (C) off the thermostat cover (D).

7. Remove the screws (A) and thermostat cover (D).

8. Remove the thermostat (F) and seal (E).

9. Clean the contact surfaces.

10. Install a new thermostat and seal.

11. Install the thermostat cover (D) and screws (A).

12. Tighten the screws (A) to specification:

    Item	Measurement	Specification
    Thermostat Cover Screws	Torque	47 N·m (35 lb·ft)

13. Connect the hose (C) with the hose clamp (B) on the thermostat cover (D).

14. Tighten the hose clamp (B).