General Procedure

NOTE: Refer to general specifications in the appropriate 303-01 engine section for the appropriate specification.

NOTE: The valve stem diameter must be within specifications before checking valve stem-to-valve guide clearance. REFER to Valve Stem Diameter .

NOTE: If necessary, use a magnetic base.

Fig 1: Measuring Valve Stem Diameter

Courtesy of FORD MOTOR CO.

Install a Valve Guide Clearance Gauge on the valve stem and install a Dial Indicator Gauge with Holding Fixture.
Lower the valve until the clearance gauge contacts the upper surface of the valve guide.
Move the Valve Guide Clearance Gauge toward the Dial Indicator Gauge with Holding Fixture and zero the Dial Indicator Gauge. Move the Valve Guide Clearance Gauge away from the Dial Indicator Gauge with Holding Fixture and note the reading. The reading will be DOUBLE the valve stem-to-valve guide clearance.