Engine. Engine lubrication system

Engine

DESCRIPTION

The 4.7 liter (287 CID) eight-cylinder engine is an 90 single overhead camshaft engine. The cast iron cylinder block is made up of two different components; the first component is the cylinder bore and upper block, the second component is the bedplate that comprises the lower portion of the cylinder block and houses the lower half of the crankshaft main bearings. The cylinders are numbered from front to rear with the left bank being numbered 1,3,5 and 7, and the right bank being numbered 2,4,6 and 8. The firing order is 1-8-4-3-6-5-7-2. The engine serial number is located at the right front side of the engine block (Fig. 1)

Engine lubrication system

DESCRIPTION

The lubrication system (Fig. 2) is a full flow filtration pressure feed type.

OPERATION

Oil from the oil pan is pumped by a gerotor type oil pump directly mounted to the crankshaft nose. Oil pressure is controlled by a relief valve mounted inside the oil pump housing. For lubrication flow refer to (Fig. 2).

The camshaft exhaust 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. Due to the orentation of the rocker arm, the camshaft intake lobes are not lubed in the same manner as the exhaust lobes. The intake lobes are lubed through internal passages in the camshaft. Oil flows through a bore in the number 3 camshaft bearing bore, and as the camshaft turns, a hole in the camshaft aligns with the hole in the camshaft bore allowing engine oil to enter the camshaft tube. The oil then exits through 1.6mm (0.063 in.) holes drilled into the intake lobes, lubricating the lobes and the rocker arms.

Fig. 1 Engine Identification Location.

1 - VEHICLE VIN NUMBER LOCATION

2 - CYLINDER BLOCK RIGHT HAND SIDE

3 - CYLINDER BORE #2

ENGINE LUBRICATION FLOW CHART-BLOCK: TABLE 1

Fig. 2 Engine Oil Lubrication System

1 - LEFT CYLINDER HEAD OIL GALLERY

2 - OIL PRESSURE SENSOR LOCATION

3 - TO LEFT CYLINDER HEAD

4 - OIL FEED TO IDLER SHAFT

5 - OIL PUMP OUTLET TO BLOCK

6 - OIL PUMP

7 - TO CRANKSHAFT MAIN JOURNALS

8 - RIGHT CYLINDER HEAD OIL GALLERY

9 - TO RIGHT CYLINDER HEAD

10 - CYLINDER BLOCK MAIN GALLERY

11 - OIL FEED TO BOTH SECONDARY TENSIONERS

ENGINE LUBRICATION FLOW CHART-CYLINDER HEADS: TABLE 2