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ENGINE—LUBRICATION CONDITION POSSIBLE CAUSE CORRECTION Oil Leaks 1. Gaskets and O-Rings 1. (a) Misaligned, Torn or Deteriorated. (a) Replace. (b) Loose fastener, broken or porous metal. Tighten, repair or replace. 2. Crankshaft Rear Seal 2. (a) Misaligned, inverted or torn lip. (a) Replace seal. (b) Torn, cut or shaved seal back bead. (b) Replace Seal. 3. Crankshaft Seal Flange 3. (a) Scratched, nicked or grooved. (a) Replace or polish if necessary. 4. Cylinder block to mating surface. 4. (a) Inadequate sealant. (a) Apply sealant per service manual. (b) Oil hole burr. (b) Carefully stone or chamfer hole. 5. Oil Pan to Rear Main Cap Sealant. 5. (a) Inadequate or mislocated sealant. (a) Apply sealant per service manual. (b) Torn, cut or damaged oil pan gasket. (b) Replace gasket. (c) Cracked or damaged oil pan. (c) Replace oil pan. 6. Chain Case Cover Seal 6. (a) Misaligned, or misinstalled. (a) Replace. (b) Torn, cut or damaged seal casing or (b) Replace seal. (c) Scratched or damaged vibration damper (c) Minor damaged can be polished out; Oil Pressure Drop 1. Low Oil Level. 1. Check engine oil level correct as 2. Faulty Oil Pressure Sending Unit. 2. Replace sending unit. 3. Low Oil Pressure 3. Check main bearing oil clearance. 4. Clogged Oil Filter. 4. Replace oil filter. 5. Worn Parts in Oil Pump. 5. Replace oil pump. 6. Thin or Diluted Oil. Change oil to correct viscosity. 7. Oil Pump Relief Valve Stuck. 7. Replace oil pump. 8. Oil Pump Suction Tube Loose, Bent or 8. Replace suction tube. 9. Oil Pump Cover Warped or Cracked. 9. Replace oil pump. Oil Pumping at 1. Worn Scuffed or Broken Rings. 1. Hone cylinder bores and replace rings. Rings; Spark Plugs 2. Carbon in Oil Ring Slot. 2. Replace Rings. Fouling 3. Rings Fitted too Tightly in Grooves. 3. Measure piston grooves, if incorrect 4. Worn Valve Guides Service guides per service manual. 5. Leaking Intake Gasket 5. Replace intake gaskets. 6. Leaking Valve Guide Seals. 6. Replace seals. 9 - 74 4.7L ENGINE WJ DIAGNOSIS AND TESTING (Continued) |