Lesson 4/Learning Event 1
Notice that from two of the camshaft bearings, two oil lines lead to the hollow-valve rocker arm shafts at the
top of the engine. These lines are usually very small or have restrictor valves in them to reduce the amount of
oil going to the rocker arm shafts to lubricate the valve train.
In most engines the main oil line and oil feeder lines are drilled passages in the engine block and cylinder head.
In all cases, the oil passages between the main bearings and connecting rod bearings are drilled holes in the
crankshaft
.
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