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Home >> Ford >> 2017 >> Flex SEL, AWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine System - General Information >> General Procedures >> Valve Guide Inner Diameter
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Valve Guide Inner Diameter

NOTE: Refer to the appropriate Engine article for the specification.

  1. 1.

    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.

    Use a ball gauge to determine the inside diameter of the valve guides in 2 directions at the top, middle and bottom of the valve guide.

GFD56535Courtesy of FORD MOTOR COMPANY

  1. 2.

    Measure the ball gauge with a micrometer.
GFD56536Courtesy of FORD MOTOR COMPANY

  1. 3.

    If the valve guide is not within specifications, install a new cylinder head assembly.
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