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The camshaft exhaust valve lobes and rocker arms are lubricated through a small hole in the rocker a bore in the number 3 camshaft bearing bore, and ENGINE LUBRICATION FLOW CHART—BLOCK: TABLE 1 FROM TO Oil Pickup Tube Oil Pump Oil Pump Oil Filter Oil Filter Block Main Oil Gallery Block Main Oil Gallery 1. Crankshaft Main Journal 2. Left Cylinder Head* 3. Right Cylinder Head* Crankshaft Main Journals Crankshaft Rod Journals Crankshaft Number One Main Journal 1.Front Timing Chain Idler Shaft 2.Both Secondary Chain Tensioners Left Cylinder Head See Table 2 Right Cylinder Head See Table 2 * The cylinder head gaskets have an oil restricter to control oil flow to the cylinder heads. ENGINE LUBRICATION FLOW CHART—CYLINDER HEADS: TABLE 2 FROM TO Cylinder Head Oil Port (in bolt hole) Diagonal Cross Drilling to Main Oil Gallery Main Oil Gallery (drilled through head from rear to front) 1. Base of Camshaft Towers 2. Lash Adjuster Towers Base of Camshaft Towers Vertical Drilling Through Tower to Camshaft Bearings** Lash Adjuster Towers Diagonal Drillings to Hydraulic Lash Adjuster Pockets ** The number three camshaft bearing journal feeds oil into the hollow camshaft tubes. Oil is routed to the intake lobes, which have oil passages drilled into them to lubricate the rocker arms. DIAGNOSIS AND TESTING—ENGINE OIL (1) Remove oil pressure sending unit (Fig. 96)and install gauge assembly C-3292. (2) Run engine until thermostat opens. • 3000 rpm—170 - 550 KPa (25 - 80 psi) Check for a clogged oil pick-up screen or a pressure DIAGNOSIS AND TESTING—ENGINE OIL LEAK Begin with a thorough visual inspection of the engine, particularly at the area of the suspected leak. (1) Do not clean or degrease the engine at this time because some solvents may cause rubber to (2) Add an oil soluble dye (use as recommended by manufacturer). Start the engine and let idle for 9 - 184 ENGINE 4.7L AN LUBRICATION (Continued) |