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Home >> Lincoln >> 2005 >> Aviator AWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine System-General Information >> General Procedures >> Valve Guide Inner Diameter

Valve Guide Inner Diameter

    NOTE: Valve guides tend to wear in an hourglass pattern. The ball gauge can be inserted into the combustion chamber side of the valve guide if necessary.
    Fig 1: Setting Ball Gauge Into Valve Guide Inner Diameter
    G03862297Courtesy of FORD MOTOR CO.
  1. Use a ball gauge to determine the inner diameter of the valve guides in 2 directions at the top, middle and bottom of the valve guide.
  2. Measure the ball gauge with a micrometer.
    • Refer to the appropriate article in ENGINE for the specification.
    Fig 2: Measuring Ball Gauge With A Micrometer
    G03862298Courtesy of FORD MOTOR CO.
  3. If the valve guide is not within specifications, ream the valve guide and install a valve with an oversize stem or remove the valve guide and install a new valve guide.
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