1.14. ENGINE LUBRICATION SYSTEM.

TM 5-3895-373-20 1.14. ENGINE LUBRICATION SYSTEM. The main components of the engine lubrication system include the oil pump, oil cooler, oil filter, and oil pressure sensing devices. The lubrication of the engine is of the force feed type. The oil is circulated by a gear type pump internal to the engine balancer unit mounted to the bottom of the engine block inside the oil sump. The oil is drawn through a sump strainer tube to the pump. Oil is then pumped to the engine internal oil passages. The oil pump provides a high pressure oil flow to a through port on the engine oil adapter plate. A supply hose connected to the port routes the high pressure oil to the oil cooler and filter. A pressure tap off the high pressure port supplies oil to an engine oil pressure transmitter. The resistance of the transmitter changes based on the sensed oil pressure. A pressure gauge on the operator gauge panel displays the oil pressure. Inside the oil cooler high pressure oil flows through cooling vanes and into the oil filter. Engine coolant circulates through the oil cooler, removing excess heat from the engine oil. A replaceable filter element in the oil filter removes particulates from the engine oil. Filtered oil is routed back to the return port on the engine oil adapter plate. Oil returned from cooling and filtration flows into the engine oil gallery inside the engine block. The oil is then routed throughout the engine. An oil sampling valve and STE/ICER oil pressure transmitter are located at the input to the oil cooler and filter. Oil filter input and output pressures are monitored by a differential pressure transmitter. When filter contamination inhibits oil flow, the transmitter turns on. The transmitter condition can be detected at the DCA connector using STE/ICER Test Nos. 35 and 36. 1-17