SERVICE MANUALLUBRICATING OIL PUMP, OIL FILTERS & COOLERSection 8GENERALThe lube oil system is unique in that with the exception ofthe injection pump and Turbocharger oil supply (1 5, Fig.1), there Is NO EXTERNAL PIPING to direct oil from onecomponent to the next. The system is a full- flow typewith a by-pass valve.The lubrication system supplies filtered lubricating oil atoptimum temperatures throughout the engine to reducefriction, minimize wear and operate engine controls. Oilpressure is used to end starting fuel delivery when theengine starts, and is an actuating force in the injectionpump advance unit. Lubricating oil transfers heat fromthe turbocharger, piston sleeves, valves and othercomponents to the cooling system and surrounding air.Because the lubricating oil contacts most moving parts inthe engine, keeping the lubricating oil free of abrasivematerials is necessary to obtain long engine life.Lubricating Oil Pump:The pump (4, Fig. 1) is a "GEROTOR" type mounted onand driven directly by the crankshaft (7) at engine speed.Oil from the sump in the oil pan flows through a tube (8)and to the front cover opening (3, Fig. 2) where it entersthe pump.Figure 2. - Lube 011 Passage Locations in Front Cover& Crankcase1. Lower oil gallery2. Pressure outlet3. Front cover openingAfter passing through the pump, the oil re- enters thecover and is channeled through the pressure outlet (2,Fig. 2) of the cover Into the forward end of the lower oilgallery (1, Fig. 2) of the crankcase.Leaving the gallery, the oil passes through the externallymounted oil cooler (6, Fig. 1). Upon leaving the cooler,the oil re-enters the crankcase passage and flows pastthe main regulator valve assembly (10, Fig. 1). The oil,under regulated pressure, again leaves the crankcase,and through two passageways, enters the externallymounted filter base (11).Depending upon the immediate conditions, the oil cancontinue on in one of two directions, or in someinstances, divide and travel in both. During normaloperation, the flow of oil continues on through both filterelements (14, Fig. 1) on its way back into the crankcasemain oil gallery. However, if the filters are not changedas per Operator’s Manual recommendations, excessivefilter contamination and pressure drop will result. Whensuch conditions occur, the pressure differential type ofby-pass valve will open allowing the oil to by- pass thefilters and flow directly into the crankcase main oil gallerywhere it Is distributed to all parts of the engine. Oil fed tothe main bearings also reaches the connecting rodbearings and the piston cooling jets (5, Fig. 1). Thesame drilled holes that feed oil down to the mains directoil up to the camshaft bushings. The annulus cut in therear camshaft bearing allows some of the oil fed tocontinue up to the rear valve lever shaft bracket (16, Fig.1) where it is transferred to the hollow shaft (1, Fig. 16)and distributed to all valve levers. Push rod ball sockets,tap- pets, valve stems, cam on the camshaft and thegears are all SPLASH-LUBRICATED.The "GEROTOR" pump draws oil from the pan through astationary pickup tube .(1, Fig. 3) bolted to the crankcasefront cover (2, Fig. 3).CGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 2
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