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2 A Systems Approach PowerPoint® Presentation Prepared by René Green

3 Chapter 9

4 yChapter Overview yThis chapter concentrates attention on the various types of combustion chambers and intake and exhaust valves. The discussion continues on to reconditioning aluminum cylinder heads, resurfacing cylinder heads, grinding valves, valve guide reconditioning, and reconditioning valve seats.

5 yChapter Objectives yDescribe the purpose of an engine's cylinder head, valves, and related valve parts. yDescribe the types of combustion chamber shapes found on modern engines. yExplain the procedures involved in reconditioning cylinder heads, valve guides, valve seats, and valve faces. yExplain the steps in cylinder head and valve reassembly.

6 zCylinder Head zCombustion Chamber yWedge Chamber y Hemispherical Chamber y Swirl Chamber y Chamber-in-Piston y Fast-Burn Combustion Chamber

7 zIntake and Exhaust Valves yPoppet Design

8 yValve Face yMargin

9 yValve Guides yValve Springs, Retainers, and Seals yValve Rotators yMultivalve Engines zAluminum Cylinder Heads yReconditioning Aluminum Cylinder Heads

10 zResurfacing Cylinder Heads ySurface Finish

11 yBelt Surfacers yMilling Machines yBroaching Machines ySurface Grinders yStock Removal Guidelines xCombustion chamber volumes Compression ratio Piston/valve interference and misalignment

12 zGrinding Valves

13 zValve Guide Reconditioning yKnurling yReaming and Oversized Valves yThin-Walled Guide Liners yValve Guide Replacement xIntegral guides xInsert guides

14 zReconditioning Valve Seats yInstalling Valve Seat Inserts

15 yReconditioning Integral Seats

16 yGrinding Valve Seats yCutting Valve Seats yMachining Valve Seats

17 zValve Stem Seals yInstalling Positive Valve Seals

18 yInstalling Umbrella- Type Valve Seats yInstalling O-Rings yValve Spring xFreestanding height test xSpring squareness test xOpen/close spring pressure test

19 yValve Spring Retainers and Keepers xValve rotators

20 zAssembling the Cylinder Head.