TM 5-3895-373-201.14.ENGINELUBRICATIONSYSTEM.The main components of the engine lubrication systeminclude the oil pump, oil cooler, oil filter, and oil pressuresensing devices. The lubrication of the engine is of theforce feed type. The oil is circulated by a gear typepump internal to the engine balancer unit mounted to thebottom of the engine block inside the oil sump. The oil isdrawn through a sump strainer tube to the pump. Oil isthen pumped to the engine internal oil passages.The oil pump provides a high pressure oil flow to athrough port on the engine oil adapter plate. A supplyhose connected to the port routes the high pressure oil tothe oil cooler and filter. A pressure tap off the highpressure port supplies oil to an engine oil pressuretransmitter. The resistance of the transmitter changesbased on the sensed oil pressure. A pressure gauge onthe operator gauge panel displays the oil pressure.Inside the oil cooler high pressure oil flows throughcooling vanes and into the oil filter. Engine coolantcirculates through the oil cooler, removing excess heatfrom the engine oil. A replaceable filter element in the oilfilter removes particulates from the engine oil. Filteredoil is routed back to the return port on the engine oiladapter plate. Oil returned from cooling and filtrationflows 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 pressuretransmitter are located at the input to the oil cooler andfilter. Oil filter input and output pressures are monitoredby a differential pressure transmitter. When filtercontamination inhibits oil flow, the transmitter turns on.The transmitter condition can be detected at the DCAconnector using STE/ICER Test Nos. 35 and 36.1-17
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