General information
Cars use a pressurized engine lubrication system. Oil from the oil pan through the strainer and fine filter is supplied under pressure by the oil pump. The pressure reducing valve maintains the required pressure in the engine lubrication system. If the pressure in the engine lubrication system exceeds a certain level, the bypass valve opens and part of the oil flows back into the oil pan.
Passing through the oil filter, the purified oil enters the main oil line. It has an emergency oil pressure drop sensor, which, by turning on the warning lamp in the instrument cluster, signals low oil pressure.
From the main line, oil under pressure is supplied through the channels to lubricate the main bearings of the crankshaft and then through the channels in the crankshaft to the connecting rod bearings.
Through the channels, oil is supplied to the cylinder head for lubrication of the camshaft bearings and to the hydraulic tappets.
Pic. 4.61. Oil pump: 1 - key; 2 - chain; 3 - oil pump
The oil pump is driven by a chain from a sprocket located on the front of the crankshaft (pic. 4.61).
The oil pump is fastened with three bolts, which are tightened to a torque of 16 Nm.
The aluminum alloy oil pan is mounted on the E10 sealing paste, and its relative position is determined by the centering sleeve.
Oil pressure check
To check the pressure it is necessary to use a manometer with a hose and fitting and a special tool 1503-H, connected instead of an oil filter.
Attention! Checking the engine oil pressure is carried out on a hot engine after checking the oil level.
Remove the bottom protection of a motor compartment.
Install a drip pan under the engine to collect leaking engine oil.
Remove the oil filter.
Pic. 3.91. Installing Special Tool 1503-H (2) with fitting (1) in place of the oil filter
Install special tool 2 (see fig. 3.91) 1503-H in place of the oil filter.
Screw fitting 1 of the pressure gauge onto special tool 2.
Connect a tachometer to the engine.
Start the engine.
Set the engine speed to 1000 min-1, determine the oil pressure in the engine using the pressure gauge and compare it with the technical data.
Similarly, measure the oil pressure at a frequency of 2000, 3000 and 4000 min-1.
Stop the engine.
Disconnect the tachometer and pressure gauge from the engine.
Install the oil filter.
Install the lower engine compartment protection.
Check the oil level and top up if necessary.