DSG-423 GENERAL INFORMATION
01-32
Valve Stem Diameter
• Measure the diameter of each intake and exhaust
valve stem at the points shown. Verify the diameter
is within specification.
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.
1. Install the Valve Stem Clearance Tool on the valve
stem and install the 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
Dial Indicator and zero the Dial Indicator. Move the
Valve Stem Clearance Tool away from the Dial
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.
Valve Inspection
Inspect the following valve areas:
• The end of the stem for grooves or scoring.
• The valve face and the edge for pits, grooves or
scores.
• The valve head for signs of burning, erosion,
warpage and cracking. Minor pits, grooves and other
abrasions may be removed.
• The valve head thickness for wear.
Special Tool(s)
Dial Indicator with Bracketry
TOOL-4201-C or Equivalent
Valve Stem Clearance Tool
TOOL-6505-E or Equivalent
Special Service Tools called for
by the procedures can be
obtained by calling:
1-800-ROTUNDA
(1-800-768-8632)
Valve Stem
Valve Face
Valve Head
Valve Head
Thickness
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