TM 9-2815-538-24&P
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LUBRICATION SYSTEM The engine oil pump (figure 3) is located inside the gear case assembly and is driven directly by the crankshaft. The engine oil pump pulls oil from the engine oil pan through the oil suction pipe and pushes the oil through the regulator valve, bypass valve, and oil cooler to the oil filter. The regulator valve regulates and stabilizes the engine oil pressure with the engine running at rated rpm. The bypass valve allows oil to flow through the engine if the oil filter becomes clogged. From the oil filter, oil flows to the main oil gallery in the cylinder head. The main oil gallery distributes oil to crankshaft journals, camshaft bearings, fuel injection pump assembly, and turbocharger. The fuel injection pump receives oil from the main gallery which it supplies to the turbocharger. If oil pressure drops, the oil pressure switch sends a signal to the control panel to indicate low oil pressure. All oil eventually flows back into the oil pan for recirculation.
Figure 3. Lubrication System.
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