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VALVE STEM SEAL DESCRIPTION The valve stem seals are made of rubber and incor- porate a garter spring to maintain consistent lubrica- INTAKE MANIFOLD DESCRIPTION The intake manifold is made of cast aluminum and uses seven bolts to mount to the cylinder head. This EXHAUST MANIFOLD DESCRIPTION The exhaust manifold is log style and is made of high silicon molybdenum cast iron. The exhaust man- DIAGNOSIS AND TESTING ENGINE DIAGNOSIS—INTRODUCTION Engine diagnosis is helpful in determining the causes of malfunctions not detected and remedied by These malfunctions may be classified as either per- formance (e.g., engine idles rough and stalls) or Refer to the Service Diagnosis—Performance chart and the Service Diagnosis—Mechanical chart for pos- 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. Fig. 12 Intake and Exhaust Manifold 9 - 8 2.5L ENGINE XJ DESCRIPTION AND OPERATION (Continued) |