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VALVE - STEM DIAMETER Mercury Mountaineer II

Engine System-General Information 3 illustrations ~168 words

VALVE - STEM DIAMETER

  1. Measure the diameter of each intake and exhaust valve stem at the points shown. Verify the diameter is within specification. Refer to the appropriate ENGINE article for the procedure. If out of specification, install new components as necessary. Refer to the appropriate ENGINE article for the procedure.

Scheme 64

Scheme 64
Scheme 64

Scheme 65

Scheme 65: VALVE - STEM TO VALVE GUIDE CLEARANCE
Scheme 65: VALVE - STEM TO VALVE GUIDE CLEARANCE

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

Scheme 66

Scheme 66
Scheme 66
  1. NOTE: If necessary, use a magnetic base. 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.