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

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Presentation on theme: "RECONDITIONING CYLINDER HEADS Chapter 9 u Page 209 Classroom Manual u Page 207 Lab Manual."— Presentation transcript:

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

2 CHAPTER OBJECTIVE n Correct valve guide clearance by: Knurling. Reaming to accept oversize valve stems. Installing bronze guide liners. Installing cast iron guide inserts. n Replace intregal and insert valve seats. n Grind valve seats & correct contact pattern.

3 CHAPTER OBJECTIVE n Recondition valve faces & tips. n Identify proper valve face-to-seat contact pattern. n Correct valve stem seal allignment. n Replace worn or damaged pressed-in rocker arm studs with oversize and threaded studs. n Resurface cylinder head sealing surface.

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

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

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

7 UNLEADED GAS u Valve seat wear u Loss of valve lash

8 Temperature Protection u Positive valve rotators u Rotators can cause excessive valve face wear u Multi-Groove keepers allow passive rotation u Check Multi-Groove valves for wear u Sodium filled valves Page 165

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

10 MEASURING the VALVE STEM u.001 MAXIMUM WEAR

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

12 OIL CONSUMPTION u Figure 9-16 Page 218 Classroom Manual

13 GUIDE PROTRUSION u Figure 9-19 Page 221 Classroom Manual

14 BEVELING GUIDE u Figure 9-25 Page 224 Classroom Manual

15 SEAT ANGLES u Figure 9-26 Page 224 Classroom Manual

16 VALVE SEAT GRINDING Page 227

17 VALVE SEAT GRINDING u Figure 9-33 Page 228

18 BEFORE TOPPING u Figure 9-36 Page 229

19 AFTER TOPPING u Figure 9-36 Page 229

20 FINISHED SEAT


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