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Home >> Ford >> 2005 >> Freestar Base >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine System-General Information >> General Procedures >> Valve Stem to Valve Guide Clearance >> Guide Clearance

Guide Clearance

    NOTE: If necessary, use a magnetic base.
    Fig 1: Measuring Valve Stem To Valve Guide Clearance
    G03885047Courtesy of FORD MOTOR CO.
  1. Install a Valve Guide Clearance Gauge on the valve stem and install a Dial Indicator Gauge with Holding Fixture. Lower the valve until the Valve Guide Clearance Gauge contacts the upper surface of the valve guide.
  2. Move the Valve Guide Clearance Gauge toward the indicator and zero the indicator. Move the Valve Guide Clearance Gauge away from the indicator and note the reading. The reading will be DOUBLE the valve stem-to-valve guide clearance. Valves with oversize stems will need to be installed if out of specification.
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