Remove/install coolant thermostat

AR20.10-D-2461TSM

Remove/install coolant thermostat

24.03.2020

Engine

654.9 in model 907.1/2/6

Shown on model 907.6 except code HK4 (heavy-duty rear air conditioning)

1

Coolant thermostat

2

Coolant hose

3

Coolant line

4

Screw

5

Coolant hose

Shown on model 907.6 except code HK4 (heavy-duty rear air conditioning)

1

Coolant thermostat

9

Electrical connector

12

Screw

6

Coolant temperature sensor

10

Screw

13

Screw

7

Screw

11

Screw

14

Screw

8

Cable duct

 Warning

Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.

Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

 

Remove/install

1

Drain off coolant.

AR20.00-D-1142TSM

2.1

Remove belt pulley/vibration damper.

Engine 654.9 in model 907.1/2/6
with code HK4 (Rear air conditioning, reinforced)

AR03.30-D-1600TSM

2.2

Remove poly-V-belt.

Engine 654.9 in model 907.1/2/6
except code HK4 (Rear air conditioning, reinforced)

AR13.22-D-1202TSM

3

Remove coolant temperature sensor (6).

AR07.16-D-1090TSM

4

Remove the coolant hose (2) from the coolant line (3).

AR20.20-P-7441-01RQ

 Collect escaping coolant.

5

Seal the opening on the coolant hose (2) and coolant line (3) with protective covers.

 Set of protective covers

*001589019100

6

Unscrew bolt (4).

 The screw (4) is fixed with a thread lock on the coolant line (3).

 Screw/bolt, coolant line to bracket

*BA20.20-N-1001-02TSM

7

Remove coolant line (3) from the coolant thermostat (1) and take out.

AR20.20-P-7441-01RQ

 Collect escaping coolant.

8

Seal opening on the coolant line (3) and coolant thermostat (1) with protective covers.

 Set of protective covers

*001589019100

9

Remove coolant hose (5) from the coolant thermostat (1).

AR20.20-P-7441-01RQ

 Collect escaping coolant.

10

Seal opening on the coolant hose (5) and on the coolant thermostat (1) with protective covers.

 Set of protective covers

*001589019100

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

11

Remove heat shield bottom part under the diesel particulate filter.

AR49.20-D-0007-01TSM

 Screw, heat shield lower section on diesel particulate filter to bracket

*BA49.20-N-1003-02TSM

12

Remove screws (7) from the cable duct (8).

13

Unclip cable duct (8) from the retaining clips (arrows) and bring out of the working area.

 Long wedge

*115589035900

14

Release and disconnect the electrical connector (9) from the coolant thermostat (1).

15

Expose electrical wiring harness on the coolant thermostat (1).

16

Remove screws (10 to 14).

 Installation: Tighten screws (10 to 14) in the numerical sequence.

 Screw, coolant thermostat to coolant pump housing

*BA20.10-N-1002-01TSM

17

Remove coolant thermostat (1).

 Collect escaping coolant.

 Installation: Replace seal.



Clean

18

Clean sealing surfaces with a lint-free rag.

19

Install in the reverse order.



Check

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

20

Perform engine test run.

 Coolant pump, coolant thermostat

Number

Designation

Engine 654.9 in model 907

BA20.10-N-1002-01TSM

Screw, coolant thermostat to coolant pump housing

Nm

8

 Engine radiator, coolant hoses and lines

Number

Designation

Engine 654.9 in model 907

BA20.20-N-1001-02TSM

Screw/bolt, coolant line to bracket

Nm

8

 Diesel particulate filter

Number

Designation

Engine 654.9 in model 907

BA49.20-N-1003-02TSM

Screw, heat shield lower section on diesel particulate filter to bracket

Nm

8