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Checking oil pressure
The engines have only one oil pressure sensor (black and blue wire, distinctive color - blue, 0.25 bar). At engines progenitor two switches. With the engine running at idle speed indicator lamp lights up when the oil pressure falls below 0.15-0.35 bar and the contact closes.
| Fig. 89. Details to be withdrawn for the dismantling of the oil pump, and the remaining parts of the lubrication system: 1 - the oil filler plug; 2 - oil pressure (0.25 bar); 3 - bolt 10 Nm; 4 - a guide tube for oil dipstick; 5 - guide (used in the workshop for collecting engine oil); 6 - the dipstick; 7 - camshaft pulley; 8 - the oil filter; 9 - an asterisk on the crankshaft; 10 - a tension roller of a gear belt; 11 - nut 20 Nm; 12 - the timing belt; 13 - the top casing of a gear belt; 14 - the bottom casing of a gear belt; 15 - a bolt, 90 Nm + 120 ?�; 16 - a pulley (shock absorber); 17 - a gear pulley of a cranked shaft; 18 - oil seal rings; 19 - flange with oil seal rings; 20 - a lining (always replace); 21 - grommet; 22 - chain drive; 23 - the oil pump; 24 - a cover of the oil pump with pressure relief valve; 25 - oil drain plug 30 Nm; 26 - a sealing ring (always replace); 27 - oil pan; 28 - a bolt of fastening of the oil bath; 29 - installation (if installed); 30 - mount on the underside of the crankcase; 31 - O-ring (always replace); 32 - the air filter; 33 - the filler pipe
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Oil Pressure Switch 2 (see. Fig. 89) is installed between the spark plugs. Engine oil pressure can be checked using a pressure gauge, which should have a connecting element that allows to screw it in place of the oil pressure sensor. The sensor can be checked, the following description assumes that you need to have a pressure gauge or indicated in Fig. 96, or the like with a connecting element for the oil pressure sensor.
| Fig. 96. Connection points for checking oil pressure: 1 - black-and-blue wire; 2 - a control lamp; 3 - brown wire
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To check the oil pressure, proceed as follows: - Disconnect the cable from the clamps oil pressure sensor and remove the sensor from the engine (the sensor is located next to the spark plug); - Screw the switch in the gauge and connect the blue wire 1; - Set in the cylinder head gauge instead of the sensor; - Connect warning lamp 2 to the wire 1 and the "plus" terminal of the battery; - Connect wire 3 (brown) with "weight". Switch on the ignition. The test lamp should light up immediately. If not, the sensor must be replaced (it is assumed that the control lamp burns); - Start the engine and set the idle; - It checks whether the warning lamp is switched off at a pressure of 0.15-0.35 bar. If not, install a new sensor; - To increase the engine speed up to 2000 min-1 and make sure the gauge shows a pressure of at least 2.0 bar. Otherwise, replace the sensor, or check whether there is a fault in the oil pump. It is recommended to check that the service station, before analyzing the oil pump. It is necessary that the oil level in the oil sump match required.
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