Remove/install coolant thermostat

AR20.10-S-2461PS

Remove/install coolant thermostat

16.04.2019

Engine

642 in model 470, 471

Modification notes

15.04.2019

Method extended

Operation step 3

15.04.2019

Document reference added.

Operation step 4

1

Coolant thermostat housing

2

Bolts

3

Coolant hose

4

Charge air pipe

5

Fuel line

7

Leak oil line

5

Fuel line

6

Screw

 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

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

 

Remove/install

1

Drain off coolant.

AR20.00-S-1142PS

2

Remove charge air pipe (4).

AR09.41-S-1333PS

 Installation: Only install upper engine cover after the leak test.

3

Remove leak oil line (7) from the coolant thermostat housing (1).

4

Remove coolant hose (3) from the coolant thermostat housing (1).

AR20.20-S-3865-15S

 Plug openings.

 Set of protective covers

*001589019100

5

Remove screws (6) from fuel line (5).

 Bolt, fuel line to cylinder head cover/crankcase/cylinder head/charge-air distributor

*BA07.16-N-1014-03PS

6

Remove screws (2).

 To remove the bottom screw (2), carefully press the fuel line (5) to one side.

 Bolt, coolant thermostat housing to charge air distributor

*BA20.10-N-1002-01PS

7

Remove coolant thermostat housing (1) with coolant thermostat.

 The coolant thermostat housing (1) and coolant thermostat form a single unit and can be replaced only together.

 Installation: Replace sealing ring.

 Assembly tool

*000589936300

8

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

9

Perform engine test run and check repair area in terms of leak tightness.

 Visual inspection only.

 Common Rail diesel injection system

Number

Designation

Engine 642 in model 470, 471

BA07.16-N-1014-03PS

Bolt, fuel line to cylinder head cover/crankcase/cylinder head/charge-air distributor

M6x12

Nm

9

M6x15

Nm

14

 Coolant pump, coolant thermostat

Number

Designation

Engine 642 in model 470, 471

BA20.10-N-1002-01PS

Bolt, coolant thermostat housing to charge air distributor

Nm

9