1 - body
2 - a bolt with an internal hexagon. 10 Nm
3 - thermostat
4 - thermostat housing cover
5 - a bolt with an internal hexagon. 10 Nm
6 - «ABOUT» -shaped sealing ring
7 - housing cover
8 - plug
9 - temperature sensor for monitoring the operation of the radiator fan
10 - temperature sensor of the injection system
11 - safety clamps
The thermostat is located in the water pump housing under a cover sealed with an o-ring. The thermostat can be removed by removing the hose at the end of the cover and unscrewing the cover. Remove the O-ring from the cover and check it immediately.
The thermostat is beyond repair; if damaged, it must be replaced.
The thermostat is located in a separate housing, which, outside the thermostat itself, has two temperature sensors: one for measuring the temperature of the coolant, and the other for monitoring the radiator fan.
A design feature of both temperature sensors and the installed plug is a mount that does not twist in the right way. as is usually expected, but which is secured with spring clips. The temperature sensors and the plug are equipped with O-rings, and the seal itself is provided by the mutual compression of these O-rings with a hard fit of the seal collars.
If the plugs are removed, they must not be mixed up, since the temperature sensor, designed to measure the temperature of the coolant, has two connecting pins, while the other - designed to monitor the radiator fan - has 4 pins.
The thermostat itself is under the cover (to which the hose is attached), which is sealed with an O-shaped seal. The thermostat can be removed after the hose at the end of the cover is removed and the cover is unscrewed. The seal is separated from the cover and checked immediately.
A simple thermostat test can be done as follows.
The thermostat is lowered on a piece of wire into a tank of cold water.
Hang the thermostat in the same way.
Gradually heat the water and check if the thermostat begins to open at a temperature of 85°C. At 105°C the thermostat should open completely.
With this check, the thermostat pin should protrude at least 7 mm from it. If the thermostat fails this test, it must be replaced. When installing the thermostat, a round seal is used. Check the clamp before reattaching it to the hose. Fill the cooling system.
If other parts have been removed from the thermostat housing, the following points should be taken into account during installation
Attach the thermostat housing to the engine with a new O-ring and tighten the long bolts to 10 Nm.
When the housing cover is removed (7) and coolant pipe, the O-ring is replaced. The coolant pipe is firmly pressed into the cover, and the cover is screwed to the thermostat housing with a tightening torque of 10 Nm.
If temperature sensors are removed (spring clamps are squeezed out with a screwdriver), then a new sealing ring is installed, the corresponding sensor is firmly inserted into the hole, and the spring clamps are pushed up. The spring clip must «sit» firmly, otherwise it is impossible to ensure a reliable seal.
If the coolant pipe has been removed. then new sealing rings are installed on both ends of this tube, and the tube is pressed into the attachment points.
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