Inspect cooling system for leaks

AR20.00-P-1010NKB

Inspect cooling system for leaks

09.06.2016

Engine

270 in model 242

Engine

270, 607, 651 in model 117

Engine

270, 607, 651 in model 156

Engine

270, 607, 651 in model 176, 246

Modification notes

26.09.2014

Mischungsverhältnis Kühlmittel

BF20.00-P-1001-04A

Shown on vehicle with gasoline engine

1

Cap

3

Tester cap

2

Coolant expansion reservoir

4

Pressure pump

 Danger !

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

Checking prepared

1

Switch on ignition

2

Adjust heater to maximum heat output

3

Unscrew cap (1) on coolant expansion reservoir (2)

 Unscrew cap (1) slowly and relieve overpressure.

4

Check coolant level and antifreeze content coolant



Notes on coolant level

AH20.00-P-1142-01CW

 Coolant mixing ratio

*BF20.00-P-1001-04A

5

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

 Test cap

*210589009100

6

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

 Pressure pump

*124589242100

7

Apply test pressure to cooling system

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 components and connections

If no coolant loss is seen:



Check coolant carrying components for inner leaktightness.

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

9

Remove test pressure in the cooling system

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

10

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

11

Unscrew on tester cap (3) at coolant expansion reservoir (2)

12

Switch off ignition

13

Check coolant level



Notes on coolant level

AH20.00-P-1142-01CW

14

Screw cap (1) onto coolant expansion reservoir (2)

Radiator or expansion reservoir cap

Number

Designation

1-stage cover latch

2-stage cover latch

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

BF20.00-P-1001-04A

Coolant mixing ratio

Antifreeze/water

Up to -37°C

%

50/50

As of -38 °C

%

55/45

Sheet

BB00.40-P-0310-01A

Sheet

BB00.40-P-0325-00A

Sheet

BB00.40-P-0326-00A