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The camshaft exhaust valve lobes and rocker arms are lubricated through a small hole in the rocker arm; oil flows 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* 4. Counterbalance Shaft Rear Journal Crankshaft Main Journals Crankshaft Rod Journals Crankshaft Number One Main Journal 1. Front Timing Chain Idler Shaft 2. Counterbalance Shaft - Front Journal 3. Both Secondary Chain Tensioners Left Cylinder Head Refer to Engine Lubrication Flow Chart - Cylinder Right Cylinder Head Refer to Engine Lubrication Flow Chart - Cylinder * 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 DIAGNOSIS AND TESTING ENGINE OIL LEAK Begin with a thorough visual inspection of the engine, particularly at the area of the suspected leak. If an oil leak 1. Do not clean or degrease the engine at this time because some solvents may cause rubber to swell, temporarily stopping the leak. 2. Add an oil soluble dye (use as recommended by manufacturer). Start the engine and let idle for approximately 15 minutes. Check the oil dipstick to make sure the dye is thoroughly mixed as indicated with a bright yellow color 9 - 1252 ENGINE - 3.7L SERVICE INFORMATION WK |