Inspect cooling system for leaks

AR20.00-B-1010XA

Inspect cooling system for leaks

02.02.2018

Engine

350.905 in model 382.1

Engine

457.9 in model 382.15, 634.0

Engine

902.9 in model 384.063

Engine

904.9 in model 368, 382.11, 384, 688.2

Engine

904.9 in model 688.232/244/254/255

Engine

906.9 in model 368, 382.1

Engine

924.9 in model 368, 384, 685.282/284/289/290

Engine

926.9 in model 368, 382.17/18, 384.06/07

Represented in engine 457.9

1

Supply mouth cap

2

Expansion tank

3

Tightness checking device

3.1

Intake connection, quick coupler

3.2

Discharge valve

3.3

Intake pressure valve

Represented in engine 904.9

1

Supply mouth cap

2

Expansion tank

3

Tightness checking device

3.1

Intake connection, quick coupler

3.2

Discharge valve

3.3

Intake pressure valve

Represented in the engine 902.9, 906.9

1

Supply mouth cap

2

Expansion tank

3

Tightness checking device

3.1

Intake connection, quick coupler

3.2

Discharge valve

3.3

Intake pressure valve



Check

 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

1

Remove the expansion tank's (2) cap (1)

2

Actuate the heat control, putting it in the opened position

 Vehicle equipped with heating system.

3

Check the coolant level and correct it if necessary



Engines 350.905, 457.9, 902.9, 904.9, 906.9, 924.9, 926.9

AP20.00-B-2010XA



Engine 904.9 in TYPE 688.232/254/255

AP20.00-B-2010E

4

Install the tightness tester (3) in the reservoir supply mouth (2)

 Assemble the tester, in such a way that it stays firmly fastened in the mouth.

 Tester

*001589832100

5

Connect a compressed air line to the intake connection (3.1) of the tester device (3)

 The compressed air line must be equipped with an open and shut control valve.

6

Submit the system to a pressure of 1.0 bar, controlling it by the regulator (3.3)

 When the pressure in the system reaches the check value (1.0 bar), interrupt the air feed, closing the compressed air line control valve.

7

Check the tightness of the system, paying attention to the pressure stability, shown in the manometer of the tester device (3)

 If a pressure drop is shown in manometer tester (3), check for leaks the engine, the water pump, the hoses, tubes, connections, radiator, expansion tank of the heating and cooling system.

8

Depressurize the system through the discharge valve (3.2) and remove the tester (3)

 Disconnect the compressed air line from the intake connection (3.1).

 Tester

*001589832100

9

Correct eventual leaks in the heating and cooling system

 Re-tighten the clamps and replace them. Replace the hoses or tubes. Repair or replace the radiator, water pump, expansion tank and correct engine leaks.

10

Install the cap (1) in the expansion tank's (2)