12-6
5. Lubrication of Engine Components
• The engine oil in the main oil gallery lubricates the engine components in the following ways.
5.1 Main bearing and connecting rod bearing
• Engine oil supplied through an oil passage in the crankshaft lubricates the big end (connecting rod bearing) of
each connecting rod. Simultaneously, engine oil supplied through an oil passage in the connecting rod lubricates
the connecting rod’s small end (connecting rod bushing).
5.2 Timing gears
• Engine oil in the main oil gallery is directed through the oil passages in the crankcase and cylinder head and is
used to lubricate the various gear shafts. After lubricating the gear shafts, the oil is used to lubricate the gears be-
fore returning the oil pan.
STRUCTURE AND OPERATION
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