Valve Stem To Valve Guide Clearance

Fig 1: Identifying Special Tool(s)

Courtesy of FORD MOTOR CO.

NOTE: The valve springs must be removed before checking valve stem to valve guide clearance.

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

Courtesy of FORD MOTOR CO.

Install a Valve Guide Clearance Gauge on the valve stem and install a Dial Indicator Gauge with Holding Tool. Lower the valve until the Valve Guide Clearance Gauge contacts the upper surface of the valve guide.
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.