Lesson 4/Learning Event 1
FIGURE 52. COMBINATION SPLASH AND FORCE-FEED LUBRICATION SYSTEM.
The combination splash and force-feed systems of engine lubrication were used on some American-made
vehicles until the middle 1950s. An engine using this system still relies on dippers on the connecting rods to
lubricate the connecting rod journals, the cylinder walls, and the pistons and rings. Other parts, such as the
main bearings, valves, camshaft, and timing gears are lubricated by oil supplied by a pressure pump.
Compare the lubrication system shown with the one above. Notice the parts that have been added to provide
oil under pressure to some parts of the engine. Item A is an oil pump. It is usually driven by a gear on the
camshaft. The pump picks up the oil through a pickup tube in the engine oil pan B. Item C is the oil passage
leading from the oil pump to the main bearings and to other engine parts that are supplied oil under pressure.
Notice one oil passage leads to a small jet or nozzle that can spray the