Engine Lubrication: Description and Operation

Engine Lubrication System:

Engine Lubrication Components:

System is full flow filtration, pressure feed type. The oil pump is mounted within the crankcase and driven by the auxiliary shaft. Pressurized oil is routed through the main oil gallery, to the main and rod bearings, then to the lower balance shaft assemblies. Pistons ars lubricated from directed holes in connecting rod assemblies. Camshaft and valve mechanisms are lubricated from a full-length cylinder head oil gallery supplied from the crankcase main oil gallery.

MAIN/ROD BEARINGS
A diagonal hole in each bulkhead feeds oil to each main bearing. Drilled passages within the crankshaft route oil from main bearing journals to crankpin journals.

ACCESSORY SHAFT
Two separate holes supply oil to the accessory shaft.

BALANCE SHAFTS
For 2.5L engine balance shafts lubrication an additional hole interconnects with a passage in one leg of the balance shaft carrier to route oil down to the carrier oil gallery This gallery directly supplies the balance shafts front bearings and internal machined passages in the shafts routes oil from front to rear shaft bearing journals.

CAMSHAFT/HYDRAULIC LIFTERS
A vertical hole at the number five bulkhead routes (through a restrictor) pressurized oil up past a cylinder head bolt to an oil gallery running the length of the cylinder head. Hydraulic adjusters are supplied directly from this gallery while diagonal holes supply oil to the camshaft journals. The camshaft journals are partially slotted to allow a predetermined amount of pressurized oil to pass into the bearing cap cavities with small holes directed to spray lubricate the camshaft lobes.

SPLASH LUBRICATION
Oil returning to the pan from pressurized components supplies lubrication to the valve stems. Cylinder bores and wrist pins are splash lubricated from directed holes in the connecting rods.