Remove grease and scale in the cooling system

AR20.00-B-1030C

Remove grease and scale in the cooling system

12.02.16

Clean the grease



During the normal operation, if the engine tends to overheat without apparent reasons, the removal of incrustations and rust is recommended



Before the removal of the incrustation and rust the system must be free from grease, even if the coolant is apparently free from contamination by lubricant oil

Danger!

Risk of accidents due to the accidental movement of the operating engine . Risk of injury due to being smashed or burned during the start-up procedure or when the engine is operating

Make sure the vehicle is prevented to accidentally move. Wear work clothes well tight and closed. Do not touch heated or moving parts.

AS00.00-B-0005-01A

Danger!

Risk of injury at the skin and eyes due to burns caused by steam or overheated coolant. Risk of poisoning due to ingestion of coolant

Open the cooling system only when the temperature is below 90 °C. Open the cap slowly and allow the surplus of pressure to go out. Coolant must never be kept in beverage recipients. Open the cooling system only when the temperature is below 90 °C.

AS20.00-B-0001-01A



With the engine cold or up to a maximum temperature of 50oC

1.1

Remove the plug (3) located at the bottom part of the radiator and the plug (2) located at the oil cooler head and drain completely the cooling system

For the engines 457.915/916/925/929/931/932; 475.9 and 476.9.

1.2

Unfasten the clamp (5) and remove the hose (6) from the bottom part of the radiator

For the engines 457.922/928.

If a heating system is present, put previously its control in the heating position and pay attention to have the tap opened.

In the case of buses, the taps located in the engine compartment must be opened and the draining taps at the tubes next to the heating radiator.

Eliminate the coolant in an environment friendly manner.

2

Remove the thermostatic valves

For engines 475.9, 476.9

AR20.10-B-2460C

For engines 457.922/928/931

AR20.10-B-2460D

For engines 457.915/916/925/929/932

AR20.10-B-2460E

3

Install two thermostatic valves used blocked at the maximum opening to ensure that the whole flow circulates in the radiator



Preparation of the blocked thermostatic valves at maximum opening condition

 The blocked valve permits the complete circulation of the liquid by the cooling system at any temperature.

WF58.50-B-2002-01A

Valve opening travel for the engine 457.9

*BE20.10-B-1002-02B

Valve opening travel for the engine 475.9476.9.

*BE20.10-B-1002-02C

4

Install the drain plug

5

Open the coolant supply mouth cap (1), and supply the cooling system with the detergent solution

Mix of clean water and 5% of detergent product (50g detergent product, for every 950 grams of water).

*BR00.45-B-1003-04A

 Do not use soda caustic soda (sodium hydroxide) or other very alkaline product. Such products negatively affect the aluminum components of the colling system.

6

Actuate the engine up to intermediate rotation up to reaching a temperature of 80oC and keep it in this temperature for 20 minutes, if necessary, cover the radiator

7

For the engine, wait until the temperature goes down up to 50oC

8

Remove the lower hose or plug (3) of the radiator and the plug (2), drain completely the cooling system's solution

Eliminate the cooling system's solution in an environment friendly manner.

Repeat consecutively, twice, the operations of supply, engine operation and draining, mentioned below.

9

Open the cover (1) of the cooling system and supply immediately the system with clean water

10

Operate the engine for 5 minutes

11

With the engine at a temperature under 50oC, remove the lower hose or the plug and drain completely the cooling system

Eliminate the coolant in an environment friendly manner.



Check

12

Check if it is necessary to clean the incrustations/rust

If it is necessary to clean the incrustations/rust, follow the steps explained below:

Clean incrustations/rust deposits

13

Fill the cooling system with descaling solution

Solution of water and citric acid, in a 10% proportion (100 cm3of citric acid for every 900 grams of water).

*BR00.45-B-1004-04A

14

Operate the engine at average rotation until the temperature reaches 80oC and keep it at this temperature for 10 minutes, approximately

15

Stop the engine, wait until the temperature goes down up to approximately 50oC

16

Drain completely the cooling system's solution

17

Rinse the cooling system at least three times, with clean water and at each rinsing operation, operate the engine for 5 minutes

18

Remove the blocked valves at their maximum opening or permanent opening

19

Install the thermostatic valves

For engines 475.9, 476.9

AR20.10-B-2460C

For engines 457.922/928/931

AR20.10-B-2460D

For engines 457.915/916/925/929/932

AR20.10-B-2460E

20

Install and tighten the draining plugs, if there are no plugs, or install the lower hoses

21

Supply with coolant

Anti-corrosion and antifreeze solution: 



Change the coolant

Buses

AP20.00-B-2080A



Trucks

AP20.00-B-2080B

Número

Denominação

Engine 457.9

BE20.10-B-1002-02B

Main valve

Maximum opening

of C

95

Minimum stroke

mm

8

Número

Denominação

475.9 engine; 476.9

BE20.10-B-1002-02C

Main valve

Maximum opening

°C

95

Minimum stroke

mm

8

Número

Denominação

Número de pedido

BR00.45-B-1003-04A

Degreasing

P3 AL 580 E

BR00.45-B-1004-04A

Deep cleaner

Citric acid