Check low-temperature circuit cooling system for leaks

AR09.41-P-1010OLF

Check low-temperature circuit cooling system for leaks

16.11.2018

Engine

642, 651 in model 222

1

Cap

4

Pressure pump

2

Low-temperature circuit coolant expansion reservoir

5

Cover

3

Tester cap

 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

 Warning

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

Topical note

Notes on coolant

AH20.00-N-2080-01A

Notes on coolant level

AH20.00-P-1142-01CW



Remove

1

Switch on ignition.

2

Remove engine cover.

3

Remove engine air intake duct upstream of air filter.

4

Remove cover (5).

5

Unscrew cap (1) at low-temperature circuit coolant-expansion reservoir (2).



Check

6

Check coolant level and antifreeze content of coolant in low-temperature circuit.



Engine 651 in model 222

AP20.30-P-2052N



Engine 642 in model 222

AP20.30-P-2052J

If antifreeze content is too low,



Replace coolant.

AR09.41-P-6834OLF

7

Attach tester cap (3) to low-temperature circuit coolant-expansion reservoir (2).

 Test cap

*210589009100

8

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

 Pressure pump

*124589242100

9

Apply pressure to low-temperature circuit.


Do not exceed the specified test pressure.
Otherwise the cooling system can get damaged.

Test pressure for pressure-testing the engine cooling system

*BE20.30-P-1005-01A

10

Perform visual inspection of components carrying coolant.



Install

11

Release overpressure via valve at pressure pump (4) and remove pressure pump (4).

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

 Pressure pump

*124589242100

12

Unscrew tester cap (3) at low-temperature circuit coolant-expansion reservoir (2).

 Test cap

*210589009100

13

Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).

14

Check coolant level in low-temperature circuit coolant-expansion reservoir (2), correct if necessary.



Engine 651 in model 222

AP20.30-P-2052N



Engine 642 in model 222

AP20.30-P-2052J

15

Attach cap (1) to low-temperature circuit coolant-expansion reservoir (2).

16

Install cover (5).

17

Install engine air intake duct upstream of air filter.

18

Install engine cover.

 Ensure correct seating.

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