Remove grease and scale in the cooling system

AR20.00-I-1030B

Remove grease and scale in the cooling system

14.12.10

Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running

Secure vehicle to prevent it from moving by itself.
Wear closed and snug-fitting work clothes.
Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

 Danger!

Risk of injury to skin and eyes caused by scalding from contact with hot coolant spray. Risk of poisoning caused by 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



Notes on coolant

AH20.00-N-2080-01A

1

Drain coolant completely

 Dispose of coolant in an environmentally friendly manner.



Replace coolant

AP20.00-I-2080B

2

Remove coolant thermostat (1)

AR20.10-I-2460B

3

Block main valve in coolant thermostat (1) in open position

4

Install coolant thermostat (1)

AR20.10-I-2460B

Remove grease

5

Fill cooling system with a solution of a mildly alkaline cleaner and fresh water

 Mixing ratio: 50 g mildly alkaline cleaner to 1 liter of water.

Cleaner for engine and cooling system

*BR00.45-Z-1009-04A

6

Allow engine to warm up at a medium rotational speed and let it continue to run for about 5 minutes at a coolant temperature of approx. 80°C

7

Switch off engine and allow coolant temperature to cool down to approx. 50°C

8

Fully drain off solution of a mildly alkaline cleaner and fresh water out of the cooling system

 Dispose of the mildly alkaline cleaner and fresh water in an environmentally friendly manner.

9

Flush out cooling system twice with fresh water

 To do this allow the engine to run for every flushing filling for about 5 minutes.

Dispose of the water in an environmentally acceptable manner.

Remove scale

10

Fill cooling system with a solution of water and citric, tartaric or oxalic acid

 Mixing ratio: 100 g citric acid to 1 liter water.

It is preferable to use citric acid.

Before removing scale, always remove grease in the cooling system even if there is no visible sign of oiling.

Chromic acid or products containing chrome must not be used because of the risk of contaminating wastewater.
Chemicals for preparing the solutions can be obtained from the chemical trade.
Commercially available products which contain the aforementioned acids, may also be used for removing scale and rust.

11

Allow engine to warm up at a medium rotational speed and let it continue to run for about 10 minutes at a coolant temperature of approx. 80°C

12

Switch off engine and allow coolant temperature to cool down to approx. 50°C

13

Fully drain off solution of water and citric, tartaric or oxalic acid

 Dispose of the solution of water and citric, tartaric or oxalic acid in an environmentally acceptable manner.

14

Flush out cooling system at least three times with fresh water

 To do this allow the engine to run for every flushing filling for 5 minutes. Dispose of the water in an environmentally acceptable manner.

15

Remove coolant thermostat (1)

AR20.10-I-2460B

16

Remove blocking device at coolant thermostat (1)

 Check the coolant thermostat (1) for damage; replace if necessary.

17

Install coolant thermostat (1)

AR20.10-I-2460B

18

Fill cooling system with coolant

 Replace coolant.



Replace coolant

AP20.00-I-2080B

Number

Designation

Order number

BR00.45-Z-1009-04A

Cleaner for engine and cooling system

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