Remove/install coolant thermostat

AR20.10-G-2460N

Remove/install coolant thermostat

05.06.2018

Engine

470.9, 471.9 in model 800.110/112

1

Coolant thermostat

2

Oil/coolant module

3

Coolant hose

4

Sealing ring

5

Securing clamp

 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

 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-N-5000-01H

 

Remove/install

1

Drain off coolant.

AR20.00-G-1142N

2

Remove left charge air pipe.

Only if this is required for accessibility purposes.

AR09.41-G-1327N

3

Remove coolant thermostat (1) from oil/coolant module (2).

 Collect escaping coolant using suitable vessel.

 Installation: Replace sealing ring.

 Bolt, coolant thermostat to oil/coolant module

*BA20.10-N-1002-01V

4

Remove coolant hose (3) at coolant thermostat (1).

 Installation:
Replace sealing ring (4) in quick-release fastener of coolant hose (3) and coat with lubricant. Click safety Clamp (5) into place on the coolant hose (3).
Leaks in engine cooling system and resulting consequential damage can otherwise occur.

Lubricant, rubber assembly 1 l

*BR00.45-Z-1010-06A

5

Install in the reverse order.

6

Start engine, perform engine test run and switch off engine again.

 Allow engine to run at a higher rotational speed.
See information from body manufacturer.

7

Check area of coolant thermostat (1) for leaks.

 Visual inspection.

 Coolant pump, coolant thermostat

Number

Designation

Engine 470.9

Engine 471.9

BA20.10-N-1002-01V

Bolt, coolant thermostat to oil/coolant module

Nm

30

30

Repair materials

Number

Designation

Order number

BR00.45-Z-1010-06A

Lubricant, rubber assembly 1 l

A 000 989 03 67