Lubrication system (Discovery 3)

General information

The oil is taken from a recess in the oil pan, from where the oil pump delivers oil under pressure. At the outlet of the oil pump, the oil passes through the filter, cools, and then enters the internal channels of the lubrication system.

Lubrication of all moving parts is carried out by supplying oil under pressure, or by spraying oil. Pressurized oil is also supplied to the variable valve timing mechanism and timing chain tensioners.

The oil returns to the sump under the action of gravity. Large drain holes in the cylinder heads and cylinder block provide fast oil return, reducing the amount of oil required and providing more accurate oil quantity information soon after the engine has stopped.

Filling oil into the system is carried out through the oil filler neck on the camshaft cover of the row "IN".

With the exception of the oil pump, all parts of the lubrication system are mounted on a raised sump.

Oil intake

The oil pick-up steel welded tube is immersed in a suitable recess in the oil pan and provides oil supply by the pump in all normal operating modes. Inlet mesh prevents solid particles from entering the lubrication system.

Oil pump

The oil pump is mounted on the crankshaft at the front of the engine. The inlet and outlet ports of the pump are located opposite the oil grooves in the base plate.

The working element of the pump is an eccentric rotor driven directly by flat surfaces on the crankshaft. An integrated pressure relief valve maintains an oil pump outlet pressure of 4.5 bar.

Oil filter and oil pressure sensor

The oil filter is a replaceable cartridge mounted on an adapter. An internal bypass system allows oil to bypass the filter if it is clogged.

The oil pressure sensor makes ground contact with the dashboard if there is oil pressure. The sensor is triggered in the pressure range from 0.15 to 0.41 bar.

Oil dipstick

The oil dipstick is located on the left side of the oil pan in a tube inserted into the oil pan. The two holes at the end of the dipstick correspond to the minimum and maximum oil levels. The difference between these two marks is approximately 1.5 liters.