Warning | Risk of injury. Skin or eye injuries may result when handling hot or glowing objects. | Wear protective gloves, protective clothing and safety glasses, if necessary. | |
Warning | 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. | |
Warning | 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. | |
Topical note | Notes on coolant | ||
Flush without a cleaner | |||
1 | Start engine and bring to operating temperature | Coolant temperature approx. 80 °C. | |
2 | Switch off engine, and allow to cool for approx. 30 min | So that any oil present settles in the expansion reservoir. | |
3 | Check whether the oil is in the expansion reservoir | If there is oil in the expansion reservoir. | |
| |||
Suction coolant/oil mixture from the coolant expansion reservoir and dispose of it in an environmentally way. | |||
4 | Drain coolant completely |
| |
Engine 470.9, 471.9, 473.9 | |||
Engine 936.9 | |||
5 | Remove expansion reservoir | ||
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 | Separate coolant hoses at 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 | ||
12 | Unfasten coolant hose on retarder return connectors completely and push onto the retarder pipe | Only for vehicles with code B3H (Secondary water retarder) | |
13 | Unfasten retarder coolant feed and return hose at the clamps on engine | Only for vehicles with code B3H (Secondary water retarder) | |
14 | Flush retarder coolant pipes with fresh water | Only for vehicles with code B3H (Secondary water retarder) | |
If possible use hot or warm water. Dispose of rinsing water in an environmentally friendly way. | |||
15 | Attach retarder coolant hoses | Only for vehicles with code B3H (Secondary water retarder) | |
Screw clamps are used to clean and flush. | |||
Pliers | |||
Remove oil | |||
16 | Install opened coolant thermostat | Only for engine 470.9, 471.9, 473.9 | |
| Open coolant thermostat for oil removal | ||
Both circuits are flushed through installation of the open coolant thermostat. | |||
17 | Mix a 3% cleaning solution of the mild-alkali cleaner and fresh water | | |
Mixing ratio: 30 ml cleaner to 1 l fresh water. Dispose of cleaning solution in an environmentally acceptable manner. | |||
Cleaner for engine and cooling system for oil drag-in, 10 l | |||
18 | Flush expansion reservoir with the 3percent cleaning solution | ||
19 | Install expansion reservoir | ||
20 | Fill engine cooling system with 3-percent cleaning solution | ||
21 | Set heater to maximum heat output | ||
22 | Switch on ignition and select the 4th brake stage for the retarder | The retarder is flooded. The compressed air system must be completely filled to flood the retarder. | |
23.1 | Start engine, allow to warm up to a coolant temperature of 60°C , and maintain this coolant temperature for approx. 5 min | Engine 470.9, 471.9, 473.9 | |
| |||
Cover front of cooler to achieve coolant temperature of 60°C, if necessary. | |||
23.2 | Start engine, allow to warm up to a coolant temperature of 87°C , and maintain this coolant temperature for approx. 5 min | Engines 460.9, 936.9 | |
| |||
Cover front of cooler to achieve coolant temperature of 87°C, if necessary. | |||
24 | Switch off engine, and allow to cool to coolant temperature of approx. 50°C | ||
25 | Switch off retarder | ||
26 | Drain cleaning solution completely from the engine cooling system | | |
Dispose of cleaning solution in an environmentally acceptable manner. | |||
Flush after deoiling | |||
27 | Flush heater, engine, cooler and retarder coolant pipes with fresh water | To flush with fresh water, perform operation steps 6 to 15. | |
28 | Fill and flush engine cooling system with fresh water at least 2 times | | |
| |||
Allow engine to run for approx. 5 min during each flushing process. | |||
29 | Check flushing water of last flushing process for oil drag-in | If oil is still present in flushing water, repeat de-oiling. | |
| |||
Perform work from operation step 20. | |||
30 | Check flushing water of last flushing process for acid content with a test strip | The test strips are obtainable in the EPC and display the pH value. | |
If flushing water of last flushing process does not have neutral pH. | |||
| |||
Repeat engine cooling system flushing with fresh water once. | |||
| |||
31 | Replace an opened coolant thermostat by the previously removed coolant thermostat | Only for engine 470.9, 471.9, 473.9 | |
Clean coolant thermostat before installation. | |||
32 | Pour in coolant |
| |
Engine 470.9, 471.9, 473.9 | |||
Engine 936.9 |
470 589 01 37 00
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