TM 5-3805-260-24Oil from the oil pan is pulled through the suctionbell for the oil pump (10) by oil pump (8). The oil is sentby the pump to an oil passage in the front cover for theengine (3). Oil from this passage goes to the cylinderblock and on to base for the oil cooler (5). The base forthe oil cooler is on the left side of the engine, near thefront of the engine. Bypass salve (I ), in the base for theoil cooler, will let the oil go around the oil cooler (7) whenthe oil is cold or if the restriction in the oil cooler is morethan the other parts of the system. A difference inpressure of 12 to 15 psi (85 to 105 kPa) between the oilinlet and the oil outlet will open the bypass valve.Oil from the oil cooler goes to the oil filters.Bypass valve (12), in the base for the oil cooler will let oilgo around oil filters (13) if there is a restriction in the oilfilters.There are two pressure outlets in the base forthe oil cooler. The pressure outlets are on the outlet sideof the oil cooler and oil filters. The pressure outlets arefor the sending unit and switch for the oil pressure.Oil from the oil filters (13) goes through apassage in the cylinder block to oil manifold (4). The oilmanifold is in the center of the cylinder block, above thecamshaft, and goes the full length of the cylinder block.Oil goes from the oil manifold to the bearings for thecamshaft. There are grooves in the bores in the cylinderblock around the bearings for the camshaft. The bearingsurfaces (journals) on the camshaft get lubrication fromthese grooves through a hole in the bearings for thecamshaft.Some of the oil goes around the grooves and downthrough a passage to a hole and groove in the top half ofthe main bearing. Oil from the hole and groove giveslubrication to the bearing surfaces (journals) of thecrankshaft for the main bearings.Oil gets into the crankshaft through holes in thebearing surfaces (journals) for the main bearings.Passages connect the bearing surface (journal) for themain bearing with the bearing surface (journal) for theconnecting rod. The piston pins get lubrication from oilthrown by other parts.Oil for the rocker arms comes from the oil mani-fold (4) through passages in the cylinder block. Thepassages in the cylinder block are in alignment with apassage in each cylinder head. The passage to thecylinder head on the left side is near the front of thecylinder block. The passage to the cylinder head on theright side is near the rear of the cylinder block.The passage in each cylinder head sends the oilinto an oil hole in the bottom of the mounting surface ofthe bracket that holds the shaft for the rocker arms. Theoil hole is in the front bracket on the left side and in therear bracket on the right side. The oil then goes upthrough the bracket and into the center of the shaft forthe rocker arms. Oil goes along the center of the shaft tothe bearings for the rocker arms. From the rocker arms,the oil is pushed through small holes to give lubrication tothe valves, push rods, cam followers, and cam - shaftlobes.After the lubrication oil has done its work, it willreturn to the oil pan for the engine.2-15
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