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RECONDITIONING CYLINDER HEADS

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.

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RECONDITIONING CYLINDER HEADS

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  1. RECONDITIONING CYLINDER HEADS Chapter 9 • Page 209 • Classroom Manual • Page 207 • Lab Manual

  2. 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.

  3. 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.

  4. CHAPTER OBJECTIVE • Measure & correct valve guide height. • Measure & correct valve spring installed height. • Measure & correct valve stem height.

  5. VALVES and VALVE SERVICE • Exhaust Seat temperature 800 degrees • Exhaust Valve neck temperature 1300 degrees • Depend on seat contact for cooling

  6. Effect of Valve Lash on Cooling • Tight valves will not allow proper seating • Resulting in a burned valve

  7. UNLEADED GAS • Valve seat wear • Loss of valve lash

  8. 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

  9. Exhaust and Intake Valves • Exhaust valves are smaller • Intake valves are larger • Valve stem tips are hardened

  10. MEASURING the VALVE STEM • .001 MAXIMUM WEAR

  11. STEM WEAR • Rocker arm side force on the valve stem causes valve stem and valve guide wear. • Figure 9-15 Page 217 Classroom Manual

  12. OIL CONSUMPTION • Figure 9-16 Page 218 Classroom Manual

  13. GUIDE PROTRUSION • Figure 9-19 Page 221 Classroom Manual

  14. BEVELING GUIDE • Figure 9-25 Page 224 Classroom Manual

  15. SEAT ANGLES • Figure 9-26 Page 224 Classroom Manual

  16. VALVE SEAT GRINDING Page 227

  17. VALVE SEAT GRINDING • Figure 9-33 Page 228

  18. BEFORE TOPPING • Figure 9-36 Page 229

  19. AFTER TOPPING • Figure 9-36 Page 229

  20. FINISHED SEAT

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