Inspect cooling system for leaks

AR20.00-P-1010MFD

Inspect cooling system for leaks

10.05.2019

Engine

260, 282 in model 118, 177, 247

Shown on model 177 with engine 282

1

Coolant expansion reservoir

 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

Notes on coolant level

AH20.00-P-1142-01CW

Preparatory tasks

1

Switch on ignition.

2

Set the heater to the maximum temperature.

3

Unscrew cap from the coolant expansion reservoir (1).


Unscrew the cap slowly and relieve overpressure.
Otherwise, severe injuries may result.

4

Check coolant level and antifreeze content of coolant.

 Coolant mixing ratio

*BF20.00-P-1001-04A

5

Tighten the tester cap on the coolant expansion reservoir (1).

 Test cap

*210589009100

6

Connect the pressure pump to the tester cap.

 Pressure pump

*124589242100

7

Apply test pressure to the coolant circuit.

Test pressure for pressure-testing the engine cooling system

*BE20.30-P-1005-01A



Check

8

Check condition and coolant loss for all coolant carrying assembly parts and connections.

 There is the possibility that the coolant can find its way over a defective cylinder head gasket into the combustion chamber or over a defective heat exchanger into the oil circuit.

If coolant loss is detected:



Check the component parts that carry coolant for inner leak tightness and replace them if necessary.

Final activities

9

Reduce the test pressure in the coolant circuit via the pressure relief button on the pressure pump.

 Pressure pump

*124589242100

10

Remove the pressure pump from the tester cap.

 Pressure pump

*124589242100

11

Unscrew the tester cap on the coolant expansion reservoir (1).

 Test cap

*210589009100

12

Switch off ignition.

13

Check coolant level.

 Coolant mixing ratio

*BF20.00-P-1001-04A

14

Tighten cap on coolant expansion reservoir (1).

Radiator or expansion reservoir cap

Number

Designation

Engine 100, 102, 103, 104, 110, 111, 112, 113, 114, 115, 116, 117, 119, 120, 121, 123, 127, 129, 130, 133, 137, 139, 152, 155, 156, 157, 159, 166, 180, 256, 260, 264, 266, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 282, 285
2-stage latch cover
Engine 601, 602, 603, 604, 605, 606, 607, 608, 611, 612, 613, 615, 616, 617, 621, 626, 628, 629, 640, 642, 646, 648, 651, 654, 656, 668
2-stage latch cover

BE20.30-P-1005-01A

Test pressure for pressure-testing the engine cooling system

Overpressure

bar

1,4

 Coolant mixing ratio

Number

Designation

Engine all (4xWD, CAR, smart)

BF20.00-P-1001-04A

Coolant mixing ratio

Antifreeze/water

Up to -37°C

%

50/50

As of -38 °C

%

55/45

Overview and specifications sheet

BB00.40-P-0310-01A

References to sheet specification

BB00.40-P-0310ZZ