AR20.10-B-2460B | Remove/install coolant thermostat | 12.02.16 |
Cumbustion engine 372, 374, 376, 377, 386 with Vehicle 382, 384, 386, 682, 684, 688, 693, 694, 695
B20.10-0019-09
B20.10-0007-02
1 Coolant pump
2 Connecting pipe with rubber covering
2.1 Linking tube
2.2 Sealing rings
3 Housing fastening bolts
4 Thermostat housing
5 Sealing washers
6 Connection
7 Sensor
8 Sealing ring
9 Thermostat
10 Bolts with integrated washer
11 Cap
12 Gasket
13 Cylinder head
| REMOVAL | ||
Danger! | Risk of injuries to the skin and eyes, due to burns caused by vapor or overheated coolant. Risk of poisoning due to coolant ingestion | Open the coolant system only when its temperature is below 90 °C. Open slowly the cover and let the excess pressure go out. Coolant should not be kept in beverage bottles. Use gloves, appropriate clothes and protective glasses. | |
1 | Drain the cooling system. Collect the coolant in a suitable container | Trucks fitted with 366 engine. | |
Buses with engine 364, 366, | |||
2 | Disconnect the hose from the opening of the cover (11) | ||
3 | Remove the screws (10) and withdraw the cover (11) from the housing (4) | ||
4 | Remove the thermostat (9) with the ring (8) | ||
5 | Remove the gasket (12). | ||
6 | Remove the bolts (3) and lift off the housing (4) | ||
7 | Remove the connecting tube (2) from the housing (4) | ||
8 | Remove the connection (6) and the sensor (7) if necessary | ||
| Control of the thermostat | ||
9 | Check the thermostat opening | In case of replacement, observe that the new thermostat must correspond to the same values of the previous one. | |
| Installing | ||
10 | Install the connecting tube (2) on the pump (1) and in the housing (4) of the thermostat | On older engines that utilize the tube (2.1) with sealing rings (2.2), replace them with the connecting tube (2). | |
11 | Install the gasket (12) and the housing (4) on the cylinder head (13) | The contact surfaces are to be thoroughly clean. | |
Install a new gasket (12). | |||
12 | Tighten the bolts (3) fastening the housing (4) | | |
Observe the bolts of different length. | |||
13 | Install the thermostat (9) in its seat in the housing (4) | 2 thermostats are utilized in turbocharged engines. | |
Install the new sealing ring (8) in each thermostat. | |||
Observe that the ventilation passage (groove) is located in the higher part, as indicated by the arrows. | |||
14 | Install cover (11) | The contact surfaces of the cover (11) and the housing (4) must be in good condition and perfectly clean. | |
15 | Tighten the bolts (10) of the housing cover | | |
16 | Install the connection (6) and the sensor (7) with the sealing rings (5) | Install new sealing rings (5). | |
| Indications on coolant | ||
17 | Fill the cooling system with coolant prepared in the correct proportions | Trucks fitted with 366 engine. | |
Buses with engine 364, 366, |
Coolant pump, coolant thermostat