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CAUTION: Use extreme caution when crankshaft (6) For bubbles that remain steady with shaft rotation, no further inspection can be done until dis- (7) After the oil leak root cause and appropriate corrective action have been identified, replace compo- ENGINE DIAGNOSIS Engine diagnosis is helpful in determining the causes of malfunctions not detected and remedied by These malfunctions may be classified as either mechanical (e.g., a strange noise), or performance Refer to the Engine Mechanical and the Engine Performance diagnostic charts, for possible causes and corrections of malfunctions (Refer to 9 - ENGINE For fuel system diagnosis, (Refer to 14 - FUEL SYSTEM/FUEL DELIVERY - DIAGNOSIS AND TESTING). Additional tests and diagnostic procedures may be necessary for specific engine malfunctions that can- • Cylinder Compression Pressure Test • Cylinder Combustion Pressure Leakage Test • Engine Cylinder Head Gasket Failure Diagnosis • Intake Manifold Leakage Diagnosis • Lash Adjuster (Tappet) Noise Diagnosis • Engine Oil Leak Inspection ENGINE MECHANICAL CONDITION POSSIBLE CAUSES CORRECTION VALVETRAIN NOISE 1. High or low oil level in 1. Check and correct engine oil 2. Thin or diluted oil. 2. Change oil to correct viscosity. 3. Thick oil 3. (a) Change engine oil and filter. (b) Run engine to operating (c) Change engine oil and filter 4. Low oil pressure. 4. Check and correct engine oil 5. Dirt in tappets/lash adjusters. 5. Replace rocker arm/hydraulic 6. Worn rocker arms. 6. Inspect oil supply to rocker arms. 7. Worn tappets/lash adjusters. 7. Install new rocker arm/hydraulic 8. Worn valve guides. 8. Replace cylinder head assembly. 9. Excessive runout of valve seats 9. Grind valve seats and valves. 10. Missing adjuster pivot. 10. Replace rocker arm/hydraulic TJ ENGINE 2.4L 9 - 7 ENGINE 2.4L (Continued) |