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Home >> Pontiac >> 2009 >> G3 Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 88 (Engine Mechanical - 1.6L (LDE, LLU, And LXV) Or 1.8L (2H0) - Repair Instructions - Off Vehicle) >> Valve Rocker Arm Cleaning and Inspection >> Valve Inspection Procedure

Valve Inspection Procedure

WARNING: This page is about a different car, the 2010 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Valve Damage
    GM2033830Courtesy of GENERAL MOTORS CORP.
  1. Inspect the valve for damage from the head to tip for the following conditions:
    • Pitting in the valve seat area (1)
    • Lack of valve margin (2)
    • Bending in the valve stem (3)
    • Pitting or excessive wear in the stem (4)
    • Worn valve key grooves (5)
    • Worn valve tip (6)
  2. Replace the valve if any of these conditions exist.
  3. Inspect the valve springs. If the valve spring ends are not parallel, replace the valve spring.
  4. Inspect the valve spring seating surface of the valve rotators for wear or gouges. Replace as required.
    5. Fig 2: Measuring Stem Diameter & Valve Guide Inside Diameter
    GM2033831Courtesy of GENERAL MOTORS CORP.
    NOTE: Valve guide is not movable. Replace the cylinder head if it is out of specification.
  5. Measure the valve stem diameter (1) and valve guide inside diameter (2). If it is out of specification, replace it. Refer to Engine Mechanical Specifications .
    6. Fig 3: Measuring Valve Spring Free Length
    GM2033832Courtesy of GENERAL MOTORS CORP.
  6. Measure the valve spring free length (a). If it is out of specification, replace it. Refer to Engine Mechanical Specifications .
    7. Fig 4: Measuring Valve Spring Right Angles
    GM2049765Courtesy of GENERAL MOTORS CORP.
  7. Measure the valve spring right angles (a). If it is out of specification, replace it. Refer to Engine Mechanical Specifications .
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