AR20.00-D-1030AD | Remove grease and scale in the cooling system | 14.12.10 |
ENGINES 900.917 /918 /919 in MODELS 668, 670
Remove grease | |||
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. | |
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. | |
| Notes on coolant | ||
1 | Drain coolant | ||
2 | Fill cooling system with a 5% cleaning solution of a mildly alkaline cleaner and fresh water | Mixing ratio: 50 g of cleaner to 1 l of water. | |
Cleaner for engine and cooling system | |||
3 | Crank 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. | |
4 | Switch off engine and allow coolant temperature to cool down to approx. 50°C | ||
5 | Drain cleaning solution completely from the cooling system | Dispose of cleaning solution in an environmentally acceptable manner. | |
6 | Flush cooling system 2 times with fresh water; run the engine with each flushing filling for about 5 minutes for this purpose | Dispose of water from the flushings in an environmentally acceptable manner. | |
Remove scale | |||
7 | Fill cooling system with a 10% cleaning solution of water and citric, tartaric or oxalic 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. 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. | |
8 | Crank engine and let it run at a medium rotational speed until it reaches approx. 80°C; hold it at this level for about 10 minutes | The radiator can be covered over at the front if necessary. | |
9 | Switch off engine and allow to cool down to approx. 50°C | ||
10 | Fully drain off cleaning solution | Dispose of cleaning solution in an environmentally acceptable manner. | |
11 | Flush cooling system at least 3 times with fresh water; run engine with each flushing filling for about 5 minutes for this purpose | Dispose of water from the flushings in an environmentally acceptable manner. | |
12 | Add antifreeze and top up with fresh water |
Repair materials
Number | Designation | Order number |
BR00.45-Z-1009-04A | Cleaner for engine and cooling system | - |
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