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RECONDITIONING CYLINDER HEADS. RK. Chapter 9 Page 209 Classroom Manual Page 207 Lab Manual. CHAPTER OBJECTIVE. RK. Correct valve guide clearance by: Knurling. Reaming to accept oversize valve stems. Installing bronze guide liners. Installing cast iron guide inserts. - PowerPoint PPT Presentation
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RECONDITIONING CYLINDER RECONDITIONING CYLINDER HEADSHEADS
Chapter 9Chapter 9Page 209 Classroom
ManualPage 207 Lab Manual
RRKK
Page Page
CHAPTER OBJECTIVECHAPTER 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.
RRKK
Page Page
CHAPTER OBJECTIVECHAPTER OBJECTIVE
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.
RRKK
CHAPTER OBJECTIVECHAPTER OBJECTIVE
Measure & correct valve guide height. Measure & correct valve spring installed
height. Measure & correct valve stem height.
Page Page
INTRODUCTIONINTRODUCTION
Valve guide repair. Reconditioning valve guides. Grinding valves. Reconditioning valve seats. Resurfacing cylinder head.
RRKK
Page Page
RESURFACING THE HEADRESURFACING THE HEAD
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.
RRKK
RESURFACING CONCERNSRESURFACING 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.
MANIFOLD ANGLESMANIFOLD ANGLES
SURFACE FINISHSURFACE FINISH
The rougher the surface thehigher the microinch finish.
COMPRESSION RATIOCOMPRESSION RATIO
Combustion chamber volumeCombustion chamber volume Head gasket volumeHead gasket volume Deck HeightDeck Height Cylinder volumeCylinder volume
TermsTerms
Radius = diameter /2Radius = diameter /2 Squared = number multiplied by itselfSquared = number multiplied by itself Pi = 3.1416Pi = 3.1416 Stroke = Piston movement TDC to BDCStroke = Piston movement TDC to BDC
COMBUSTION CHAMBERCOMBUSTION CHAMBER
Measure combustion chamber in cc’sMeasure combustion chamber in cc’s
HEAD GASKETHEAD GASKET
Figure head gasket volumeFigure head gasket volume Use formula Pi x radiusUse formula Pi x radius2 2 x heightx height Convert to cc’s, ci x 16.3866 = ccConvert to cc’s, ci x 16.3866 = cc
DECK HEIGHTDECK HEIGHT
Bring piston to TDCBring piston to TDC Measure from deck to pistonMeasure from deck to piston Figure area Pi x rFigure area Pi x r22 x height x height
CYLINDER VOLUMECYLINDER VOLUME
Bore divided by 2Bore divided by 2 Pi rPi r22 x stroke x stroke
CLEARANCE VOLUME AT CLEARANCE VOLUME AT TDCTDC
Combustion chamber volume in cc’s Combustion chamber volume in cc’s Head gasket volume in cc’s Head gasket volume in cc’s Deck height volume in cc’s Deck height volume in cc’s
____________ TotalTotal
CLEARANCE VOLUME AT CLEARANCE VOLUME AT BDCBDC
Combustion chamber volume in cc’s Combustion chamber volume in cc’s Head gasket volume in cc’s Head gasket volume in cc’s Deck height volume in cc’s Deck height volume in cc’s Cylinder volume in cc’s Cylinder volume in cc’s
____________ TotalTotal
COMPRESSION RATIOCOMPRESSION RATIO
Clearance volume at TDCClearance volume at TDC________________________ = CR________________________ = CR Clearance volume at BDCClearance volume at BDC