Design features of the engine lubrication system (Chevrolet Cruze J300)

The engine lubrication system is of a combined type: the most heavily 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 outside the front of the cylinder block and driven from the front end of the crankshaft,

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 on the left side. Channels for supplying oil to the crankshaft main bearings branch off from the main line. Oil is supplied to the connecting rod bearings through channels made in the crankshaft body, and then through channels in the connecting rod rods - to holes in their upper part, through which it is sprayed onto the cylinder walls and piston bottoms. A vertical channel for supplying oil to the camshaft housings and into the upper longitudinal oil channel, connected by drillings in the cylinder head to the hydraulic compensators of clearances in the valve mechanism, branches off from the main oil line. A pressure-reducing valve is screwed into the end part of the upper longitudinal channel, limiting the oil pressure in the cylinder head.

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 the third bearing 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.