TM 9-2320-260-34-1
3-77. INTAKE AND EXHAUST VALVES REFACING (Contd)
b. Grinding or Refacing Valves
NOTE
For valve refacer operating instructions, refer to TM 9-4910-484-10.
1. Install valve (1) stem in chuck.
NOTE
An out-of-round condition on valve will be marked by a small bright
spot on valve seating surface of valve head.
2. Move switch on valve refacer to "ON" position, turn wheel handle, and lightly touch valve (1) face
with grind wheel. Move grind wheel away from valve (1) and move switch on valve refacer to "OFF"
position.
3. Inspect valve (1) for bright spot. Mark position of bright spot. Rechuck valve (1) 180 from first
position. Mark position of second bright spot.
4. Note location of bright spots.
a. If bright spots are in the same position after chucking, the valve (1) is warped. Replace
valve (1).
b. If bright spots occur in different positions, the chuck is out of alinement and the valve (1) is
being incorrectly chucked. Runout should not exceed 0.001 in. (0.0254 mm).
5. Wet grind intake or exhaust valve (1) to specified angle. Refer to table 3-4, Valve Specifications, for
measurement.
6. Recheck valve (1) head thickness. If valve (1) head thickness is less than specified, replace valve (1).
c. Cleaning After Refacing
NOTE
Do not use cloth to wipe valves.
For general cleaning instructions, refer to para. 2-8.
FOLLOW-ON TASK: Install intake and or exhaust valve(s) (para. 3-51).
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