 | |
| Illustration 1 | g00660481 |
Oil flow Through The Cylinder Block (1) Rocker arm assembly. (2) Tube. (3) Drilled passage in the cylinder block between the main oil gallery and the camshaft bearings. (4) Piston cooling jet oil gallery. (5) Main oil gallery. (6) Piston cooling jets. (7) Drilled passage in the cylinder block between the main oil gallery and the crankshaft main bearings. | |
 | |
| Illustration 2 | g00660521 |
Internal Lubrication For The Cylinder Head (2) Tube. (8) Valve lifter guide. | |
The camshaft bearings receive oil from the main oil gallery (5) through drilled passages (3) in the cylinder block. The oil goes around each camshaft bearing. The oil then goes through a drilled passage in the block to the valve lifter guide (8) and the tube (2). The tube (2) connects the valve lifter guide with another drilled passage in the block. Oil flows through the tube and the passage to the cylinder head and rocker arm assembly (1) .
The main oil gallery (5) is connected to the crankshaft main bearings by a drilled passage (7) in the cylinder block. Drilled holes in the crankshaft connect the main bearing oil supply to the connecting rod bearings.
The priority valve allows the oil to go to the piston cooling jet oil gallery (4) when the pressure in the system reaches 140 kPa (20 psi). The priority valve will not allow oil into the piston cooling jet oil galleries until there is sufficient pressure in the main oil gallery (5). This decreases the amount of time that is necessary for the pressure to build up when the engine is being started. The priority valve also helps sustain oil pressure at the low idle speed.
There is a piston cooling jet (6) below each piston. The oil from the piston cooling jet enters the piston outer cooling chamber through a drilled passage in the piston body. Oil flows from the outer cooling chamber to the inner cooler chamber and drains out of the piston through a hole above the piston pin. This provides lubrication for the piston pin bearing.
 | |
| Illustration 3 | g00660411 |
Oil Flow Through The Turbocharger | |
Turbocharger oil supply line (9) sends oil to the turbocharger (10). Turbocharger oil drain lines (11) return oil to the engine oil pan through the rear housing.
Oil is sent to the front gear groups and to the rear gear groups. This is done through tubes and drilled passages that are located within the respective housings.
After the oil for lubrication has done the lubrication, the oil goes back to the engine sump.
 | |
| Illustration 4 | g00660460 |
Inlet Valve Lubrication Metering Pump | |
An inlet valve lubrication metering pump is mounted on the engine in order to provide lubrication to the inlet valves. The oil flow rate is adjusted at the factory. The inlet valve lubrication metering pump will need adjustment. Refer to the Testing And Adjusting section.