Remove grease and scale in the cooling system · ar2000w1030a · Mercedes-Benz WIS

AR20.00-W-1030A

Remove grease and scale in the cooling system

06.10.2014

ENGINE	902.9 in MODEL 957
	with CODE MS8 (Natural gas engine)
ENGINE	904.9 in MODEL 375, 673, 674, 676, 958, 970, 972, 975, 976
ENGINE	904.904 in MODEL 670
ENGINE	904.908/914/923/936 in MODEL 668, 670
ENGINE	906.9 in MODEL 374, 375, 950, 952, 953, 954, 957, 958
ENGINE	906.9 in MODEL 958, 970, 972, 974, 975, 976

Modification notes

09.01.2014

Work procedure completely revised.

 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
 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
	Notes on coolant		AH20.00-N-2080-01A
	Remove grease
1	Start engine and bring to operating temperature
2	Switch off engine and allow to cool off for approx. 30 min.	 This allows oil which is present to settle in the expansion reservoir.
3	Check whether there is oil is in the expansion reservoir	If there is oil in the expansion reservoir:
		
		Suction off oil from expansion reservoir.
4	Drain coolant completely	Models 374, 375, 673, 674, 676, 950, 952, 953, 954, 957, 958, 970, 972, 975, 976	AR20.00-W-1142C
		Model 668, 670	AP20.00-D-2080A
5	Remove expansion reservoir	Only if there is oil in the expansion reservoir.
6	Flush out expansion reservoir with a 3% cleaning solution of a mildly alkaline cleaner and fresh water	Only if there is oil in the expansion reservoir.
		 Mixing ratio: 30 ml of cleaner to 1 l of fresh water. Dispose of cleaning solution in an environmentally acceptable manner.
		Cleaner for engine and cooling system for oil drag-in, 10 l	*BR00.45-Z-1009-04A
7	Install expansion reservoir	Only if there was oil in the expansion reservoir.
8	Disconnect feed hose and return hose of the heater and flush heater with fresh water	 If possible use hot or warm water. Dispose of rinsing water in an environmentally friendly way.
9	Attach feed hose and return hose of the heater
10	Disconnect coolant hoses at the interfaces between engine, cooler and retarder
11	Flush out engine, cooler and retarder with fresh water	 If possible use hot or warm water. Dispose of rinsing water in an environmentally friendly way.
12	Attach coolant hoses at the interfaces between engine, cooler and retarder
13	Fill cooling system with a 3% cleaning solution of a mildly alkaline 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. The cooling system must be rinsed out immediately after being de-oiled. Any cleaning solution remaining in the cooling system can damage parts of the cooling system.
		 Mixing ratio: 30 ml of cleaner to 1 l of fresh water.
		Cleaner for engine and cooling system for oil drag-in, 10 l	*BR00.45-Z-1009-04A
14	Set heater to max. heat output
15	Start the engine and let it run at a medium rotational speed until the coolant temperature reaches approx. 80°C; hold coolant temperature at this level for about 5 minutes	 The radiator can be covered over at the front if necessary.
16	Switch off engine and allow coolant temperature to cool down to approx. 50°C
17	Drain cleaning solution completely from the cooling system	 Dispose of cleaning solution in an environmentally acceptable manner.
18	Flush out heater	 Carry out operation steps 8 and 9.
19	Flush out engine, cooler and retarder	 Carry out operation steps 10 and 12.
20	Flush cooling system 2 times with fresh water; run the engine with each flushing filling for about 5 minutes for this purpose	 If not decalcified, the cooling system must be filled immediately after the last flushing process with coolant. Water in the cooling system leads to corrosion.
		 Drain off flushing water completely after each flushing and dispose of it in an environmentally way.
21	Check flushing water for fouling	If the flushing water is still fouled with oil after the 2nd flushing process:
		
		Repeat the deoiling.
22	Check pH value of flushing water	Only if there is no decalcification of the cooling system.
		 The test strips can be obtained over the GLC.
		If the flushing water is not pH neutral after the last flushing process:
		
		Perform a further flushing process.
	Decalcify
23	Fill cooling system with a 10% cleaning solution of water and citric, tartaric or oxalic acid	 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. The cooling system must be rinsed out immediately after being decalcification. Any cleaning solution remaining in the cooling system can damage parts of the cooling system.
		 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. It is preferable to use citric acid. Mixing ratio: 100 g of citric acid to 1 l of fresh water. Chemicals for preparing cleaning 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.
24	Start the engine and let it run at a medium rotational speed until it reaches approx. 80°C; hold it at this temperature for about 10 minutes	 The radiator can be covered over at the front if necessary.
25	Switch off engine and allow to cool down to approx. 50°C
26	Fully drain off cleaning solution	 Dispose of cleaning solution in an environmentally acceptable manner.
27	Flush cooling system at least 3 times with fresh water; run engine with each flushing filling for 5 minutes for this purpose	 The cooling system must be filled with coolant immediately after the last flushing process. Water in the cooling system leads to corrosion.
		 Drain off flushing water completely after each flushing and dispose of it in an environmentally way.
28	Check pH value of flushing water	 The test strips can be obtained over the GLC.
		If the flushing water is not pH neutral after the last flushing process:
		
		Perform a further flushing process.
29	Pour in coolant	Models 374, 375, 673, 674, 676, 950, 952, 953, 954, 957, 958, 970, 972, 975, 976	AR20.00-W-1142C
		Model 668, 670	AP20.00-D-2080A

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

Viitatut asiakirjat

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