Pic. 166. Lubrication system of a 2.0-liter engine: 1 - gasket, replace with a new one; 2 - oil filler cap; 3 - dipstick for checking the oil level; 4 - dipstick guide tube for checking the oil level; 5 - oil pressure switch at 25 kPa; 6 - oil pressure switch at 180 kPa; 7 - check valve, 5 Nm; 8 - plugs; 9 - nut, 25 Nm; 10 - base of the oil filter; 11 - O-ring, always replaceable; 12 - oil cooler; 13 - oil filter; 14 - oil pump gear; 15 - oil pump cover with pressure reducing valve; 16 - bolt, 10 Nm; 17 - bolt, 20 Nm; 18 - oil sump mounting bolt; 19 - sealing ring, replace; 20 - oil drain plug; 21 - oil pan; 22 - gasket, replace with a new one; 23 - oil receiver; 24 - oil guide plate; 25 - gasket, replace with a new one
- The 2.0 liter engine has a 5 pressure switch (pic. 166) oil at 25 kPa (blue insulation) and oil pressure switch 6 at 180 kPa (black insulation);
- VR6 engine has a 30 kPa oil pressure switch (brown insulation) and 140 kPa oil pressure switch;
- the oil pressure in the engine can be measured using a pressure gauge with an adapter that is screwed in instead of the oil pressure switch;
- on engines (2.0L and VR6) one of the oil pressure switches is connected to a low oil pressure warning light. When the oil pressure drops below 25 kPa (engine 2.0 l) or 30 kPa (VR6 engine) the oil pressure switch is closed by 25 kPa and 30 kPa, respectively, and at the same time the low oil pressure warning lamp lights up.
When checking, both switches should be checked.
Check the oil pressure switches in the following order:
- check and, if necessary, top up the oil level in the engine;
- turn on the ignition. At the same time, the oil pressure control lamp should light up;
- start the engine. The oil pressure warning lamp should go out;
- disconnect the plug from the 25 kPa or 30 kPa oil pressure switch (determined by the color of the insulation) and short the end of the wire to «mass». The oil pressure warning light should come on;
- put on the plug again;
- disconnect the plug from the 140 kPa or 180 kPa oil pressure switch (determined by the color of the insulation);
- start the engine and let it run at a speed of more than 2000 min-1. The oil pressure warning light should come on and the horn should sound.
Check the oil pressure switch for 25 kPa or 30 kPa in the following order:
- turn the oil pressure switches 25 kPa or 30 kPa (determined by the color of the insulation);
Pic. 176. Checking the oil pressure switch: A - oil pressure switch for 25 kPa or 30 kPa; B - oil pressure switch for 140 or 180 kPa; 1 - brown wire goes to «mass»
- screw in pressure gauge 1342 (pic. 176) instead of oil pressure switch (on the 2.0-liter engine - in the cylinder head, on the VR6 engine - in the base of the filter);
- connect brown cable 1 (pic. 176) pressure gauge with «weight»;
- connect measuring device (tester or diode test lamp) between 25 kPa or 30 kPa oil pressure switch and battery positive terminal. The control lamp or light diode should light up;
- start the engine and gradually increase the speed. As soon as the pressure gauge shows 15-35 kPa (engine 2.0 l) or respectively 15-45 kPa (VR6 engine), the voltage should be 0 and the test lamp should go out. Otherwise, replace the oil pressure switch with 25 kPa or 30 kPa.
Check the oil pressure switch for 140 kPa or 180 kPa in the following order:
- disconnect the plug from the 140 kPa or 180 kPa oil pressure switch (determined by the color of the insulation);
- unscrew the switch and screw in the oil pressure gauge;
- connect measuring device (tester or diode test lamp) between 140 or 180 kPa oil pressure switch and battery positive terminal. The control lamp or light diode should not burn;
- start the engine and gradually increase the speed. Check: on a 2.0-liter engine at a pressure of 160-200 kPa, the control lamp lights up, and on a VR6 engine, the control lamp should light up at a pressure of 120-140 kPa. If it doesn't, replace the oil pressure switch;
- increase the speed to 2000 min-1 and check that the pressure gauge shows at least 200 kPa (for VR6 and 2.0 liter engine). The oil temperature must be 80°C;
- if not, replace or repair the oil pump. The oil pressure must not exceed 700 kPa.
Note. If the oil pressure is greater than 700 kPa, it means that the (does not open) pressure reducing valve on the oil pump. In this case, remove the oil filter and replace the oil pump cover together with the pressure reducing valve.
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