Check engine cooling system for leaktightness

AR20.00-P-1011MNO

Check engine cooling system for leaktightness

25.10.2019

Engine

176 in model 167

Engine

177 in model 167

Shown on model 167 with engine 176

1

Cap

2

Coolant expansion reservoir

3

Tester cap

4

Pressure pump

 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 coolant

AH20.00-N-2080-01A

Notes on coolant level

AH20.00-P-1142-01CW



Remove

1

Switch on ignition.

2

Adjust heater to maximum heat output.

3

Remove upper engine cover.



Engine 176 in model 167

AP01.10-P-2405-01M



Engine 177 in model 167

AP01.10-P-2405-01E

4

Remove lower engine compartment paneling.

AR61.20-P-1105ME

5

Remove the cap (1) on the coolant expansion reservoir (2).



Check

6

Check coolant level and antifreeze content of the coolant; correct if necessary.

 Engine 176 in model 167Cooling system

*BF20.00-P-1001-06A

 Engine 177 in model 167Cooling system

*BF20.00-P-1001-02LA

7

Install tester cap (3) on coolant expansion reservoir (2).

 Test cap

*210589009100

8

Connect pressure pump (4) at tester cap (3).

 Pressure pump

*124589242100

9

Apply a test pressure to the engine cooling system for 2 minutes.


Do not exceed the specified test pressure.
Damage will occur otherwise to the engine cooling system.

 There should be no pressure loss within a period of 2 minutes.

Test pressure for pressure-testing the cooling system

*BE20.30-P-1002-01D

10

Visually check the condition of the coolant-conducting component parts and the connections and check them for coolant loss.

If pressure loss is present:



Replace damaged assembly part.

11

Drain off overpressure via valve at pressure pump (4).

 Pressure pump

*124589242100

12

Disconnect pressure pump (4) from tester cap (3).

 Pressure pump

*124589242100

13

Detach tester cap (3) from coolant expansion reservoir (2).

 Test cap

*210589009100

14

Check coolant level and antifreeze content of the coolant; correct if necessary.

 Engine 176 in model 167Cooling system

*BF20.00-P-1001-06A

 Engine 177 in model 167Cooling system

*BF20.00-P-1001-02LA



Install

15

Attach cap (1) to coolant expansion reservoir (2).

16

Install lower engine compartment lining.

AR61.20-P-1105ME

17

Install upper engine cover.



Engine 176 in model 167

AP01.10-P-2405-01M



Engine 177 in model 167

AP01.10-P-2405-01E

18

Switch off ignition.

Cooling system check values

Number

Designation

Engine 176

Engine 177

BE20.30-P-1002-01D

Test pressure for pressure-testing the cooling system

Overpressure

bar

1,4

1,4

 Cooling system

Number

Designation

Engine 177 in model 167

BF20.00-P-1001-02LA

Cooling system

Workshop replacement amount

Main circuit

Liter

15,7

Low-temperature circuit

Liter

5,0

Antifreeze/water

Down to -37 °C

%

50/50

-38 °C and below

%

55/45

Specifications for Operating Fluids, sheet

BB00.40-P-0310-01A

Specifications for Operating Fluids, sheet

BB00.40-P-0325-06A

Specifications for Operating Fluids, sheet

BB00.40-P-0326-06A

 Cooling system

Number

Designation

Engine 176 in model 167

BF20.00-P-1001-06A

Cooling system

Workshop replacement amount

Main circuit

Liter

15,7

Low-temperature circuit

Liter

5,0

Antifreeze/water

Down to -37°C

%

50/50

-38°C and below

%

55/45

Specifications for Operating Fluids, sheet

BB00.40-P-0310-01A

Specifications for Operating Fluids, sheet

BB00.40-P-0325-06A

Specifications for Operating Fluids, sheet

BB00.40-P-0326-06A