Inspect cooling system for leaks

AR20.00-P-1010MR

Inspect cooling system for leaks

16.11.2018

Engine

274 in model 172

Engine

274 in model 204

Engine

274 in model 207

Engine

274 in model 212

Engine

274 in model 218

Shown on model 204.434

1

Cap

2

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



Check

1

Adjust heater to maximum heat output

2

Unscrew cap (1) slowly at expansion reservoir (2) and relieve overpressure

3

Check coolant level and antifreeze content coolant

Notes on coolant level

AH20.00-P-1142-01CW

 Coolant mixing ratio

*BF20.00-P-1001-04A

In a case of the antifreeze content of the coolant being too low:



Add antifreeze or replace the coolant.

4

Screw on tester cap (3) at the expansion reservoir (2)

 Test cap

*210589009100

5

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

 Pressure pump

*124589242100

6

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


Do not exceed the specified test pressure.
Damage can occur on the engine cooling system otherwise.

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

Engine 274 in model 204
2-stage latch coverTest pressure for pressure-testing the engine cooling system

*BE20.30-P-1005-01A

In the event of pressure loss:



Perform a visual inspection on the assembly parts carrying coolant.

7

Remove test pressure in the cooling system

 To do this actuate pressure relief button on the pressure pump (4).

 Pressure pump

*124589242100

8

Detach pressure pump (4) on tester cap (3)

 Pressure pump

*124589242100

9

Unscrew test cap (3) at the expansion reservoir (2)

 Test cap

*210589009100

10

Check coolant level and antifreeze content of coolant and correct if necessary

 Coolant mixing ratio

*BF20.00-P-1001-04A

11

Screw cap (2) onto low-temperature circuit coolant expansion reservoir (1)

Radiator or expansion reservoir cap

Number

Designation

1-stage cover latch

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

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