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					RECONDITIONING CYLINDER
         HEADS


     Chapter 9
 Page   209
  • Classroom Manual
 Page   207
  • Lab Manual
         CHAPTER OBJECTIVE
   Correct valve guide clearance by:
    •    Knurling.
    •   Reaming to accept oversize valve stems.
    •   Installing bronze guide liners.
    •   Installing cast iron guide inserts.
 Replace intregal and insert valve seats.
 Grind valve seats & correct contact
  pattern.
      CHAPTER OBJECTIVE
 Recondition valve faces & tips.
 Identify proper valve face-to-seat contact
  pattern.
 Correct valve stem seal allignment.
 Replace worn or damaged pressed-in
  rocker arm studs with oversize and
  threaded studs.
 Resurface cylinder head sealing surface.
      CHAPTER OBJECTIVE
 Measure & correct valve guide height.
 Measure & correct valve spring installed
  height.
 Measure & correct valve stem height.
     VALVES and VALVE
         SERVICE
 Exhaust Seat temperature 800 degrees
 Exhaust Valve neck temperature 1300
  degrees
 Depend on seat contact for cooling
Effect of Valve Lash on Cooling
 Tight valves will not allow proper seating
 Resulting in a burned valve
          UNLEADED GAS
 Valve seat wear
 Loss of valve lash
     Temperature Protection
 Positive valve rotators
 Rotators can cause excessive valve face
  wear
 Multi-Groove keepers allow passive
  rotation
 Check Multi-Groove valves for wear
 Sodium filled valves
  • Page 165
   Exhaust and Intake Valves
 Exhaust  valves are smaller
 Intake valves are larger
 Valve stem tips are hardened
   MEASURING the VALVE
         STEM
 .001   MAXIMUM WEAR
            STEM WEAR
 Rocker  arm side force
  on the valve stem causes
  valve stem and valve
  guide wear.
 Figure 9-15 Page 217
  Classroom Manual
       OIL CONSUMPTION
 Figure9-16
 Page 218
 Classroom
 Manual
      GUIDE PROTRUSION
       9-19 Page
 Figure
 221 Classroom
 Manual
           BEVELING GUIDE
 Figure9-25
 Page 224
 Classroom
 Manual
           SEAT ANGLES
 Figure9-26
 Page 224
 Classroom
 Manual
VALVE SEAT GRINDING




Page 227
   VALVE SEAT GRINDING
 Figure
 9-33
 Page
 228
           BEFORE TOPPING
 Figure
 9-36
 Page
 229
           AFTER TOPPING
 Figure
 9-36
 Page
 229
FINISHED SEAT

				
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posted:5/24/2012
language:English
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