Check engine cooling system for leaktightness

AR20.00-P-1011OLC

Check engine cooling system for leaktightness

12.12.2018

Engine

177, 264, 274, 642, 654 in model 213

Engine

264 in model 257

Engine

264, 274.9, 642, 654 in model 238

Shown on engine 654

1

Cap

2

Coolant 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

Notes on coolant level

AH20.00-P-1142-01CW



Remove

1

Remove cap(1).

2

Check coolant level and correct.

 Coolant mixing ratio

*BF20.00-P-1001-04A

3

Install tester cap (3) on coolant expansion reservoir (2).

 Test cap

*210589009100

4

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

 Pressure pump

*124589242100



Check

5

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


Do not exceed the specified test pressure.
Otherwise the engine cooling system will be damaged.

 There must not be any pressure loss within 2 min.

Engine 177 in model 213Test pressure for pressure-testing the cooling system

*BE20.30-P-1002-01D

Engine 264 in model 257
Engine 264, 274, 642, 654 in model 213
Engine 264, 274.9, 642, 654 in model 238Test pressure for pressure-testing the engine cooling system

*BE20.30-P-1005-01A

6

Check condition of all coolant carrying component parts and connections and check for leak tightness.

In the event of pressure loss.

If problems exist,



Replace corresponding components.



Install

7

Relieve test pressure via valve on pressure pump (4).

 Pressure pump

*124589242100

8

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

9

Remove tester cap (3).

 Test cap

*210589009100

10

Check coolant level and correct.

 Coolant mixing ratio

*BF20.00-P-1001-04A

11

Attach the cap(1).

Cooling system check values

Number

Designation

Engine 177

BE20.30-P-1002-01D

Test pressure for pressure-testing the cooling system

Overpressure

bar

1,4

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