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Valve Stem-To-Valve Guide Clearance

Fig 1: Identifying Dial Indicator With Bracketry & Valve Stem Checking Tool
G01941821Courtesy of FORD MOTOR CO.
NOTE: Valve stem diameter must be within specifications before checking valve stem to valve guide clearance.
    NOTE: If necessary, use a magnetic base.
    Fig 2: Measuring Valve Stem-To-Valve Guide Clearance
    G01941822Courtesy of FORD MOTOR CO.
  1. Install a Valve Stem Clearance Tool on the valve stem and install a Dial Indicator with Bracketry. Lower the valve until the Valve Stem Clearance Tool contacts the upper surface of the valve guide.
  2. Move the Valve Stem Clearance Tool toward the indicator and zero the indicator. Move the Valve Stem Clearance Tool 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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