Lesson 4/Learning Event 1
oil directly into the dipper on the connecting rod and into the tray or trough directly below dipper D. With this
arrangement, the dipper does not have to reach the oil in the pan. You can imagine what would happen if the
oil level in the pan was a bit too low for the dipper to reach. With the oil spray jet, the connecting rod
bearings and cylinder walls will be properly lubricated even if the oil level is low in the oil pan.
FIGURE 53. FORCE-FEED LUBRICATION SYSTEM.
Shown here is the force-feed lubrication system. Notice there are no dippers on the connecting rods. Instead,
the crankshaft has drilled passageways leading from each of the main bearing journals to the connecting rod
journals. Oil is delivered to the main bearing by the pump. Part of the oil travels through the drilled
passageways to the connecting rod journals.