Valve Stem to Valve Guide Clearance

SPECIAL TOOL(S)

Courtesy of FORD MOTOR CO.	Dial Indicator with Bracketry 100-002 (TOOL-4201-C) or equivalent
Courtesy of FORD MOTOR CO.	Valve Stem Checking Tool 303-004 (TOOL-6505-E) or equivalent

NOTE: Valve stem diameter must be within specifications before checking valve stem to valve guide clearance.

NOTE: If necessary, use a magnetic base.

Fig 1: Measuring Valve Stem To Valve Guide Clearance

Courtesy of FORD MOTOR CO.

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.
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.