Warm up the engine until it reaches normal operating temperature.
Safety instructions. When opening the expansion tank cap on a hot engine, care must be taken, as escaping vapors can cause severe burns. To do this, close the cap of the expansion tank with a thick layer of cloth and slowly unscrew the cap until a hissing sound is heard. After the hiss stops, slowly unscrew and remove the cap from the expansion tank. Remove the cap from the expansion tank only at temperatures below +90°C.
Remove the cap from the expansion tank and replace it with the HAZET 4800-1 tester with adapter 4800-5.
Pressurize the cooling system to 1.0 bar using the hand pump of the tester. If the pressure in the system drops to zero within a short period of time, then the cooling system is leaking and there is a coolant leak, which must be found and repaired.
To test the overpressure relief valve located in the expansion tank cap, place the cap on the tester and pressurize with a hand pump. At a pressure of 1.4-1.6 bar, the overpressure relief valve should open.
Pic. 3.2. Elements of the engine cooling system V6
1 - thermostat housing,
2 - sealing ring,
3 - thermostat,
4 - air removal screw,
5 - bolt, 25 N·m,
6 - spring retainer,
7 - temperature sensor,
8 - rear pipe of the cooling system,
9 - an earring for lifting the engine,
10 - bolt, 10 Nm,
11 - pipe of the cooling system,
12 - front pipe of the cooling system,
13 - cover,
14 - sealing ring,
15 - expansion tank,
16 - upper hose of the cooling system,
17 - pipe of the cooling system,
18 - rear casing of the toothed belt,
19 - gasket,
20 - water pump,
21 - the lower pipe of the cooling system,
22 - oil heat exchanger,
23 - belt pulley,
24 - wheel temple fan,
25 - Visco fan clutch,
26 - cover,
27 - from the lower radiator hose.
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