Jeep Cherokee

 Service Manual

Engine » 4.0L engine » Description and operation
Rocker ARM

DESCRIPTION

The rocker arms are made of stamped steel and have a operational ratio of 1.6:1. When the push rods are forced upward by the camshaft lobes the push rod presses upward on the rocker arms, the rocker arms pivot, forcing downward pressure on the valves forcing the valves to move downward and off from their seats (Fig. 8).

Fig. 7 Camshaft-Typical

1 - CAMSHAFT
2 - LOBES
3 - BEARING JOURNAL

Fig. 8 Rocker Arms 4.0L Engine

1 - CAPSCREWS
2 - BRIDGE
3 - PIVOT ASSEMBLY
4 - PUSH RODS
5 - ROCKER ARMS

Engine

Lubrication system

Cylinder block

Cylinder head

Crankshaft

Piston and connecting rod

Camshaft

Rocker ARM

Valves

Cylinder head cover

Hydraulic tappet

Valve stem seal

Exhaust manifold