RECONDITIONING CYLINDER HEADS - PowerPoint PPT Presentation

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RECONDITIONING CYLINDER HEADS

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Change in rocker arm geometry. Change in clearance volume. Misalignment of the intake manifold. Inaccurate cam timing on OHC engines. Surface finish. – PowerPoint PPT presentation

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Title: RECONDITIONING CYLINDER HEADS


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

2
CHAPTER OBJECTIVE
RK
  • 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.

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

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

5
INTRODUCTION
RK
  • Valve guide repair.
  • Reconditioning valve guides.
  • Grinding valves.
  • Reconditioning valve seats.
  • Resurfacing cylinder head.

Page
6
RESURFACING THE HEAD
RK
  • Types of resurfacing equipment
  • Belt sander
  • Surface grinder
  • Rotory broach
  • The amount of material removed, each pass,
    depends on the type of equipment used.
  • Resurfacing increases compression ratio.

Page
7
RESURFACING CONCERNS
  • Spark Knock .
  • Piston-to-valve interference.
  • Change in rocker arm geometry.
  • Change in clearance volume.
  • Misalignment of the intake manifold.
  • Inaccurate cam timing on OHC engines.
  • Surface finish.

8
MANIFOLD ANGLES
9
SURFACE FINISH
  • The rougher the surface thehigher the microinch
    finish.

10
COMPRESSION RATIO
  • Combustion chamber volume
  • Head gasket volume
  • Deck Height
  • Cylinder volume

11
Terms
  • Radius diameter /2
  • Squared number multiplied by itself
  • Pi 3.1416
  • Stroke Piston movement TDC to BDC

12
COMBUSTION CHAMBER
  • Measure combustion chamber in ccs

13
HEAD GASKET
  • Figure head gasket volume
  • Use formula Pi x radius2 x height
  • Convert to ccs, ci x 16.3866 cc

14
DECK HEIGHT
  • Bring piston to TDC
  • Measure from deck to piston
  • Figure area Pi x r2 x height

15
CYLINDER VOLUME
  • Bore divided by 2
  • Pi r2 x stroke

16
CLEARANCE VOLUME AT TDC
  • Combustion chamber volume in ccs
  • Head gasket volume in ccs
  • Deck height volume in ccs ______
  • Total

17
CLEARANCE VOLUME AT BDC
  • Combustion chamber volume in ccs
  • Head gasket volume in ccs
  • Deck height volume in ccs
  • Cylinder volume in ccs
    ______
  • Total

18
COMPRESSION RATIO
  • Clearance volume at TDC
  • ________________________ CR
  • Clearance volume at BDC
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