Engine Oil Lubrication System

Description 

Fig 1: Identifying Engine Oil Lubrication System

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Oil Lubrication System 

The oil lubrication system is a full-flow filtration, pressure feed type. The oil pump body (7) is mounted to the engine block. The pump inner rotor (3) is driven by the crankshaft (1). A windage tray, increases engine power by minimizing oil windage at high engine RPM. For increased engine oil cooling, an engine oil-to-engine coolant oil cooler is used.

Operation 

Fig 2: Identifying Engine Oil Lubrication System Operation

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Oil Lubrication System 

Engine oil stored in the oil pan is drawn in and discharged by a rotor type oil pump. The oil pump is directly coupled to the crankshaft. Oil pressure is regulated by a relief valve. The oil is fed through an oil filter and to the crankshaft journals from the oil gallery in the cylinder block. This gallery also feeds oil under pressure to the cylinder heads. Oil flows through each cylinder heads oil passage to the rocker shafts. Oil then feeds the camshaft journals, rocker arms, and hydraulic lash adjusters.

Description 

The lubrication system is a full flow filtration, pressure feed type lubrication system. The oil pump is mounted to the bottom of the cylinder block and chain driven by the crankshaft sprocket. The oil pump pick-up tube is attached to the oil pump and supported at the windage tray. There are three oil gallery plugs installed in the engine block. A system oil pressure sensor allows oil pressure to be monitored with a diagnostic scan tool. The oil pressure and oil temperature sensors are located on the oil filter housing assembly which is mounted to the top of the engine block between the cylinder heads. The oil cooler is mounted to the oil filter housing. There is a pressure relief valve in the oil pump that is only activated on a cold start or for emergency relief since the oil pump output is self-regulating. There are three piston oil cooler jets mounted to the engine block. Each jet cools two pistons.

Operation 

Fig 1: Identifying Lubrication System: Main Oil Gallery, Main Bearing Gallery & Cylinder Head Oil Channels

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

The oil from the oil pan is pumped by a vane type oil pump mounted to the bottom of the cylinder block that is chain driven by the crankshaft sprocket. The oil from the pump travels to the oil filter element and then to the oil cooler assembly. After the oil has been filtered and cooled, the oil enters the main oil gallery. The pressurized oil travels through the main gallery to the four main journals to lubricate the crankshaft main bearings. The pressurized oil travels through the crankshaft main journals to cross-drilling supplying oil to the connecting rod journals. From the number one main bearing gallery, oil travels to the right secondary chain tensioner and to the primary chain idler shaft. The main oil gallery also supplies oil to three sets of piston oil cooling jets. From the cylinder block the oil flows through drillings into the left and right cylinder heads. Left cylinder head oil is supplied to the left secondary timing chain tensioner, camshaft journals and hydraulic lash adjusters. Right cylinder hear oil is supplied to the right camshaft journals and hydraulic lash adjusters. The camshaft valve lobes and rocker arms are lubricated through a small hole in the rocker arm; oil flows through the lash adjuster then through the rocker arm and onto the camshaft lobe. Oil also flows through each of the four forward camshaft bearings into the camshafts and phasers.

Engine Lubrication Flow Chart