Inspect cooling system for leaks

AR20.00-P-1010ELA

Inspect cooling system for leaks

09.06.2016

Engine

276.8 in model 207

Modification notes

26.09.2014

Mischungsverhältnis Kühlmittel

BF20.00-P-1001-04A

1

Cap

2

Expansion reservoir

3

Tester cap

4

Pressure pump



Remove

 Danger !

Risk of injury caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.

No parts of the body or limbs should be within the operating area when the components are moving.

AS00.00-Z-0011-01A

 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



Notes on coolant

AH20.00-N-2080-01A

1

Switch on ignition

2

Adjust heater to maximum heat output

3

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

4

Check coolant level and antifreeze content coolant

 If the antifreeze content of coolant is too low, either antifreeze protection must be added or the coolant must be replaced.

 Coolant mixing ratio

*BF20.00-P-1001-04A

5

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

 Test cap

*210589009100

6

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

 Pressure pump

*124589242100

7

Apply test pressure to cooling system


The specified test pressure must not be exceeded.
Damage will occur to the cooling system otherwise.

Test pressure for pressure-testing cooling systemTest pressure for pressure-testing the engine cooling system

*BE20.30-P-1005-01A



Check

8

Perform visual inspection on coolant carrying components

AR09.41-P-1311-01AL


Check condition and seating of the Henn coupling; replace catch springs if necessary.
This avoids coolant loss.

 Check condition and coolant loss for all coolant carrying components and connections. The coolant carrying components should be checked for inner leaktightness if there is no external coolant loss. 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.



Install

9

Remove overpressure over the valve at the pressure pump (4) and remove pressure pump (4)

 Pressure pump

*124589242100

10

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

 Test cap

*210589009100

11

Switch off ignition

12

Check coolant level and antifreeze content coolant

If necessary



Notes on coolant level

AH20.00-P-1142-01CW

 Coolant mixing ratio

*BF20.00-P-1001-04A

13

Screw cap (1) onto 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