Features of the lubrication system design (Focus 2)

The lubrication system is combined: the most loaded parts are lubricated under pressure, and the rest are lubricated either by directed splashing or by splashing oil flowing out of the gaps between the mating parts. The pressure in the lubrication system is created by a gear oil pump installed on the outside in the front part of the cylinder block and driven from the front end of the crankshaft. The pump is made with internal trochoidal gear engagement.

The pump sucks oil from the engine oil sump through an oil receiver with a mesh filter and through a full-flow oil filter with a filter element made of porous paper feeds it into the main oil line located in the cylinder block body. From the main line, oil supply channels to the crankshaft main bearings extend. Oil is supplied to the connecting rod bearings through channels made in the crankshaft body. A vertical channel for supplying oil to the camshaft bearings extends from the main oil line. In addition, oil is supplied under pressure from the main engine oil line to the variable valve timing system, equipped with a separate filter installed in the cylinder head. The variable valve timing system filter is of a bypass type, i.e. it ensures the supply of oil to the variable valve timing system under any conditions.

To lubricate the camshaft bearings, oil from the vertical channel enters the central axial channels of the camshafts through a radial hole in the journal of one of the bearings and is distributed along them to the remaining bearings.



The camshaft cams are lubricated with oil coming from the central axial channels through the radial holes in the cams. Excess oil is drained from the cylinder head into the oil pan through vertical drainage channels.

Changing the engine oil and oil filter is described in Section 4 "Maintenance" (see "Changing engine oil and oil filter"), removal and installation of the oil pump are discussed in the next subsection.