Remove oil from cooling and heating system · ar2000w1250na · Mercedes-Benz WIS

AR20.00-W-1250NA

Remove oil from cooling and heating system

06.10.2014

ENGINE	934.9, 936.9 in MODEL 967
ENGINE	936.9 in MODEL 956

 Danger !	Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off 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 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
	Notes on coolant		AH20.00-N-2080-01A
	Remove
1	Start engine and bring to operating temperature
2	Switch off engine and allow to cool off for approx. 30 min.	 Therefore any oil in the expansion reservoir can settle.
3	Check whether the oil is in the expansion reservoir	If there is oil in the expansion reservoir:
		
		Suction coolant/oil mixture from the expansion reservoir.
		 Dispose of suctioned off coolant/oil mixture.
4	Remove expansion reservoir
5	Drain coolant completely	Model 956	AR20.00-W-1142NE
		Model 967	AR20.00-W-1142NA
	Flushing
6	Disconnect feed hose and return hose of the heater
7	Flush heater with fresh water	 If possible use hot or warm water. Dispose of rinsing water in an environmentally friendly way.
8	Attach feed hose and return hose of the heater again
9	Disconnect coolant hoses at the interfaces between engine and cooler
10	Flush out engine and cooler with fresh water	 If possible use hot or warm water. Dispose of rinsing water in an environmentally friendly way.
11	Attach coolant hoses at the interfaces between engine and cooler
	Remove oil
12	Mix a 3% cleaning solution of the mild-alkali cleaner and fresh water	 The cleaning solution must be mixed outside the cooling system. Parts of the cooling system can be damaged by direct pouring in of the cleaner.
		 Mixing ratio: 30 ml cleaner to 1 l of fresh water.
		Cleaner for engine and cooling system for oil drag-in, 10 l	*BR00.45-Z-1009-04A
13	Flush expansion reservoir with the 3percent cleaning solution
14	Install expansion reservoir
15	Fill cooling system with the 3percent cleaning solution
16	Set heater to max. heat output
17	Start the engine and allow to warm up a 87°C coolant temperature, hold at this coolant temperature for about 5 min.	 Cover the cooler at the front if necessary.
18	Switch off engine and allow coolant temperature to cool down to approx. 50°C
19	Drain cleaning solution completely from the cooling system	 The cooling and heating system must be flushed out with fresh water immediately after deoiling at least twice. The residual quantities of the cleaning solution can damage parts of the cooling and heating system otherwise.
		 Dispose of cleaning solution in an environmentally acceptable manner.
20	Flush out cooling and heating system with fresh water at least twice	 To flush with fresh water perform the operation steps 5 to 10. The engine should be run for about 5 minutes between the individual flushing processes. After every flushing process of the flushing water completely and dispose of in an environmentally responsible manner.
21	Check flushing water of the last flushing process for oil	The deoiling must be repeated if there is still oil in the flushing water:
		
		Perform work from operation step 11.
22	Check acid content of the flushing water of the last flushing process with a test strip	 The test strips are obtainable in the EPC and display the pH value.
		If the flushing water of the last flushing process is not pH neutral, the flushing process must be repeated once:
		
		Perform operation steps 6 to 11.
		 The cooling system must be filled with coolant immediately after the last flushing process. Residual quantities of the flushing water can lead to corrosion on parts in the cooling and heating system.
23	Pour in coolant	Model 956	AR20.00-W-1142NE
		Model 967	AR20.00-W-1142NA

Repair materials

Number	Designation	Order number
BR00.45-Z-1009-04A	Cleaner for engine and cooling system for oil drag-in, 10 l	A 002 986 42 71

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