SECTION III: PRINCIPLES OF OPERATION TM 9-2350-256-201-12POWERPLANT-Continued27Oil level indicator tube30Manifold heater ignition unit33Intake manifold heater28Starter low-voltage module31Fuel/water automatic drain control34Engine starter29Left turbosupercharger32Air intake manifold35Oil filler tubeFigure 1-6. Engine (4 of 4)1-13LUBRICATION SYSTEMa.GENERALThe main pressure oil pump draws oil from the pressure oil pump compartment in the oil pan. This compartment is fedby the scavenge oil pump which picks up oil from the front end of the oil pan and by oil which drains into the pressurecompartment from the cover of the pressure pump compartment and the reserve compartment. The pressurized oil isforced through the engine oil coolers and oil filter to the engine oil galleries, bearings, turbosuperchargers, fuel injectionpump, and piston oil sprayer nozzles. These nozzles are located in the crankcase below each cylinder and provide acontinuous oil spray to the pistons and cylinder walls. A pressure regulator valve, located on the right side of thecrankshaft damper and oil filter housing, is influenced by the pressure in the main bearing oil gallery and returns theincoming, excess, unfiltered oil to the oil pan.b.OIL PANThe oil pan is a one-piece, aluminum-alloy casting divided into a pressure oil pump compartment, oil reservecompartment, and sump compartment (at the front of the pan). Cored passages from each of the compartmentsterminate at a central outlet and permit draining of all of the compartments from a single drainage point. A coredpassage also permits draining the oil coolers and oil filter compartment directly without permitting any sludge to enter theoil pan. The oil pan is designed to maintain a constant oil level above the main pressure oil pump pickup tube in thepressure oil pump compartment during vehicle operation, regardless of the angle at which the engine may be inclined.1-19
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
