Check coolant main circuit for leaktightness

AR08.50-D-0013TE

Check coolant main circuit for leaktightness

26.11.2019

Engine

780.703 in model 910

1

Expansion reservoir

2

Cap

3

Tester cap

4

Pressure pump

 Danger

Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)

Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.

AS00.00-Z-0035-01A

 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

General information on handling vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system

AH00.00-Z-0300-01A

Topical note

Notes on coolant

AH20.00-N-2080-01A

Notes on coolant level

AH20.00-P-1142-01CW



Check

1

Remove cap (2) of expansion reservoir (1).

 First unscrew the cap (2) counterclockwise up to the first notch and release the overpressure. Then unscrew cap (2).

2

Check coolant level in expansion reservoir (1).

If the coolant level is not correct,



Correct coolant level.



Anticorrosion agent/antifreeze (specification 325.5)

BB00.40-P-0325-05A

3

Attach tester cap (3) to the expansion reservoir (1).

 Test cap

*210589009100

4

Attach pressure pump (4) to the tester cap (3).

 Pressure pump

*124589242100

 Test cap

*210589009100

5

Apply test pressure to the main circuit.


Do not exceed the specified test pressure.
Otherwise, the main circuit may be damaged.

Test pressure for main circuit

*BE08.50-N-1001-01TE

6

Check main circuit for leak tightness.

 Perform a visual inspection of the engine compartment from above.

If coolant loss has occurred,



Localize and eliminate cause.

7

Remove lower engine compartment lining

AR61.20-D-1105TS

8

Check main circuit for leak tightness.

 Perform a visual inspection of the engine compartment from below.

If coolant loss has occurred,



Localize and eliminate cause.

9

Install lower engine compartment lining.

AR61.20-D-1105TS

10

Actuate pressure release button on pressure pump (4) and reduce test pressure in the main circuit.

 Pressure pump

*124589242100

11

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

 Pressure pump

*124589242100

12

Remove tester cap (3) from expansion reservoir (1).

 Test cap

*210589009100

13

Check coolant level in expansion reservoir (1).

If the coolant level is incorrect,



Correct coolant level.



Anticorrosion agent/antifreeze (specification 325.5)

BB00.40-P-0325-05A

14

Attach the cap (2) of the expansion reservoir (1).

Cooling system

Number

Designation

Engine 780.703 in model 910

BE08.50-N-1001-01TE

Test pressure for main circuit

bar

1,4