Gasoline and diesel engines
27. Oil pan; 351. Oil level sensor; 352. Bimetal snap disk; 358. Float; 359. Magnet; 360. Reed - contact (reed contact, reed switch); 365. O-ring; a - Ventilation hole with a diameter of 8 mm; b - Drain hole with a diameter of 4 mm
The oil level indicator consists of an oil level sensor, which is installed on the drain plug in the oil pan, and a warning light on the dashboard. The indicator monitors the oil level in the oil pan starting from an oil temperature of +60°C. As soon as the ignition is switched on, the indicator lamp lights up for functional control and goes out after the engine starts to rotate.
The oil level in the oil pan is reproduced using a float (358). When the oil level is low (in the area of the lower mark of the oil dipstick) with a magnet (359) a reed switch opens in the float. Due to this, the electronics in the communication panel receives a signal and the lamp lights up.
When the oil level is too low, depending on the driving style, the control lamp first lights up briefly and then stays on.
In order to avoid false alarms in various driving situations, such as sharp turns, a delay line is integrated into the electronic circuit. It allows the control lamp to light up only after a low oil level alarm for 60 seconds.
To eliminate false indication when the engine is cold (thick oil is slowly poured into the oil pan) oil level sensor equipped with a bimetal snap-on disc (352). It prevents the float chamber from running dry through the drain hole (b) at low temperatures.
Bimetal snap disc opens at approx. +60°C and closes at approx. +30°C.
When changing the oil, the float chamber is filled with oil through the vent hole (A). This eliminates a subsequent false indication. The oil level indicator is set so that the control lamp lights up shortly before the level is reached "min" on the oil dipstick (safety reserve). Thanks to this, it is possible to fill in oil not immediately, but at the next convenient opportunity, for example, when refueling.
Diesel engine
Removing
1. Remove the bottom cover of the engine compartment.
2. Drain the engine oil.
3. Remove the plug (1) oil level sensor.
4. Remove the bolts (20). Rotate sensor (351) oil level and remove it from the oil pan.
Installation
1. Install the oil level sensor with a new O-ring and tighten to 10 Nm.
2. Put on the plug.
3. Install the bottom cover of the engine compartment.
4. Fill with engine oil.
5. Warm up the engine and check the tightness of the oil level sensor.