Pour in coolant and bleed engine cooling system

AR20.00-S-1142-03E

Pour in coolant and bleed engine cooling system

 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

Engine

654.9 in model 447

 Engine cooling system

Number

Designation

Engine 654.9 in model 447

BF20.00-N-0001-01EA

Engine cooling system

Filling capacity

Liter

10

Antifreeze/water

to -37 °C

%

50/50

Specifications for Operating Fluids, sheet

BB00.40-P-0310-01A

Specifications for Operating Fluids, sheet

BB00.40-P-0325-06A

Specifications for Operating Fluids, sheet

BB00.40-P-0326-06A

Bleeding

Shown on model 447.7

1

Tester cap

5

Drain valve

9

Compressed-air hose

2

Control unit

6

Feed hose

10

Coolant expansion reservoir

3

Venturi nozzle

7

Coolant reservoir

11

Receptacle

4

Supply valve

8

Waste air hose

1

Attach  tester cap (1) to the coolant expansion reservoir (10).

2

Attach  control unit (2) to the  tester cap (1).

3

Attach  venturi nozzle (3) to the  control unit (2).

4

Close  feed valve (4) and  drain valve (5).

5

Pour coolant in the right mixing ratio into the  coolant reservoir (7)   .

 Make sure that there is more coolant in the  coolant reservoir (7) than the engine cooling system's maximum filling capacity.
Otherwise, air will end up in the engine cooling system.

6

Attach  feed hose (6) to the  coolant reservoir (7).

7

Connect  waste air hose (8) to a suitable empty receptacle (11).

8

Connect compressed-air hose (9) to the  venturi nozzle (3) and apply compressed air from the compressed air system of the workshop.

 A vacuum is created in the engine cooling system.

9

Open  drain valve (5).

10

Open  feed valve (4) for a short time until the  feed hose (6) is filled with coolant. Then, close the  feed valve (4).

 The vacuum sucks the coolant out of the  coolant reservoir (7).

11

Close  drain valve (5) as soon as the indicator of the  control unit (2) is in the green area.

12

Disconnect compressed-air hose (9) from the  venturi nozzle (3).

13

Based on the  control unit (2), check whether the vacuum in the engine cooling system remains stable for approx. 30 s.

If the vacuum decreases:



check the engine cooling system for leak tightness, repair according to findings, and repeat vacuum test.

14

Open  feed valve (4).

 The coolant now flows out of the  coolant reservoir (7) into the engine cooling system.

15

Open  drain valve (5) as soon as no more coolant flows into the engine cooling system.

 The remaining vacuum decreases.

16

Remove  vacuum-type cooling system filler and  tester cap (1).

17

Correct coolant level in the coolant expansion reservoir (10).