Only cars produced before 7.85.
The oil pressure switch is located in the oil pan and, together with the control lamp on the instrument panel, serves to monitor the oil pressure. The membrane switch connects or disconnects the control lamp to ground.
When the engine is off - there is no oil pressure - the control lamp is connected to ground. Therefore, when the ignition is turned on, the control lamp lights up, since there is no oil pressure.
After starting under normal conditions, pressure is immediately created. The membrane in the switch moves the contact plate inside the switch, the control lamp goes out, thereby signaling that there is sufficient pressure. If the lamp lights up briefly when turning sharply, this is usually a sign of low oil level.
Disconnect the electrical wire from the oil switch and unscrew the switch.
When installing, tighten the switch with a tightening torque of 30 Nm.
Examination
Remove the oil switch and screw the switch into the appropriate control device.
Screw the control device into the oil radiator instead of the oil switch.
Connect wire "1" (blue) of the control device with the oil switch to the wire of the oil switch, wire "2" (brown) connect to mass.
Turn on the ignition. The oil pressure indicator light should come on (provided that the lamp itself and the wiring are in order). Otherwise, replace the switch.
Start the engine, slowly increase the speed and thus the oil pressure. At an excess pressure of 0.15-0.45 bar the lamp should go out.
Continue to increase engine speed. At 2000 rpm and oil temperature of +80°C, the oil pressure should be at least 2.0 bar (atm.).
If this pressure is not achieved at this speed, this is a sign of wear of the crankshaft bearings.
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