Lubrication Description
Engine lubrication is supplied by a variable displacement two-stage vane-type oil pump assembly. An oil control solenoid valve, controlled by the engine control module (ECM), mounted to the oil pump provides two stage functionality. The oil pump is mounted off-axis on the front of the engine.
All oil passing through the oil pump goes through the oil filter, where contaminants are removed. The oil filter is located on the left front side of the engine block. The oil filter is a spin-on type that mounts directly to the engine block. A bypass valve is incorporated into the oil filter, which permits oil flow in the event the filter becomes restricted.
Oil then enters the gallery where it is distributed to the crankshaft, piston oil nozzles, and timing chain oil nozzle. For turbo applications, oil is also distributed through the turbocharger oil feed and return pipes (3) and engine oil cooler. The connecting rod bearings are oiled by passages through the crankshaft connecting the main journals to the rod journals. A groove around each upper main bearing furnishes oil to the drilled crankshaft passages. The pressurized oil passes through the cylinder head restrictor orifice into the cylinder head and then into each camshaft feed gallery. Passages feed each hydraulic lash adjuster.
The front feed off the main oil gallery also feeds the timing chain tensioner (1) and the intake and exhaust side phasers and oil control valves.
A mechanical vacuum pump is not used on hybrid engine.
On the exhaust side, drilled passages feed each camshaft journal surface and the exhaust side head gallery feeds the mechanical vacuum pump. On the intake side, the oil is fed through the hollow camshaft to each camshaft journal surface, and a separate connected gallery feeds the intake side hydraulic lash adjusters.
An engine oil pressure sensor (2) is located on the intake rear side of the engine just below the head gasket interface. Oil returns to the oil pan through passages cast into the cylinder head. The phasers and timing chain drive lubrication drains directly into the oil pan behind the front cover.