Engine Lubrication

Oil Flow:

4.6L Lubrication System

1. Oil is drawn into the oil pump through the strainer in the sump.

2. Oil is pumped through the filter assembly on the left front side of the block.

3. Oil enters the main oil gallery where it is distributed to the crankshaft main journals, and to both cylinder heads.

4. From the main journals the oil is routed through cross drilled passages in the crankshaft to the crankpins for rod bearing lubrication. Controlled leakage through the main and connecting rod bearings is slung radially outward to cool and lubricate the cylinder walls as well as the entire connecting rod, piston and ring assemblies.

5. The left cylinder head is fed from a drilling into the lateral supply passage feeding the main gallery at the front of the block. The right cylinder head is fed from a drilling into the rear of the main gallery. Main gallery pressure is reduced as it enters the head galleries through the use of fixed serviceable orifices located at the upper part of the feed passages. It is this reduced pressure in the cylinder head galleries which feeds the camshaft journals, the valve lash adjusters and the chain drive hydraulic tensioners.

6. The cam lobe and roller followers are lubricated by splash created through valve train operation.