Lubrication system (Discovery 3)

General information

Oil is drawn from a recess in the oil pan, from where the oil pump supplies oil under pressure. At the outlet of the oil pump, the oil passes through a 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 oil splashing. Oil under pressure is also supplied to the valve timing mechanism and timing chain tensioners.

The oil returns to the sump by gravity. Large drain holes in the cylinder heads and block provide rapid oil return, reducing the amount of oil required and allowing more accurate oil level information to be obtained soon after the engine is stopped.

Oil is added to the system through the oil filler neck on the cover of the camshaft of row "B".

With the exception of the oil pump, all lubrication system components are mounted on a relief pan.

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Oil collection

The welded steel oil intake tube is immersed in a corresponding recess in the oil pan and ensures the supply of oil by the pump in all normal operating conditions. A mesh at the inlet 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 support plate.

The working element of the pump is an eccentric rotor, driven directly by flat surfaces on the crankshaft. The built-in pressure relief valve maintains the pressure at the outlet of the oil pump at 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 be supplied around the filter if it is clogged.

The oil pressure sensor closes the contact with the instrument panel to ground if there is oil pressure. The sensor operates in the pressure range from 0.15 to 0.41 bar.

Oil dipstick

The 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.