RECONDITIONING CYLINDER HEADS

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