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DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - LUBRICATION CONDITION POSSIBLE CAUSES CORRECTION OIL LEAKS 1. Gaskets and O-Rings. 1. (a) Misaligned or damaged. (a) Replace as necessary. (b) Loose fasteners, broken or (b) Tighten fasteners, Repair or 2. Crankshaft rear seal 2. Replace as necessary (Refer to 9 3. Crankshaft seal flange. 3. Polish or replace crankshaft. 4. Oil pan flange cracked. 4. Replace oil pan (Refer to 9 - 5. Timing chain cover seal, 5. Replace seal (Refer to 9 - 6. Scratched or damaged vibration 6. Polish or replace damper. OIL PRESSURE DROP 1. Low oil level. 1. Check and correct oil level. 2. Faulty oil pressure sending unit. 2. Replace sending unit (Refer to 9 3. Low oil pressure. 3. Check oil pump and bearing 4. Clogged oil filter. 4. Replace oil filter (Refer to 9 - 5. Worn oil pump. 5. Replace oil pump (Refer to 9 - 6. Thin or diluted oil. 6. Change oil and filter. 7. Excessive bearing clearance. 7. Replace as necessary. 8. Oil pump relief valve stuck. 8. Replace oil pump (Refer to 9 - 9. Oil pump suction tube loose, 9. Replace as necessary. 9 - 128 ENGINE 4.7L AN ENGINE 4.7L (Continued) |