Chapter9Valvetraininspection

Chapter9Valvetraininspection - Valve train inspection...

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Valve train inspection Inspect . . . Cylinder head castings Valves Guides Springs Cam and lifters Rocker arms and push rods Timing chains and gears Copyright 2003 Gary Lewis – Dave Capitolo
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Valve train inspection Cylinder head castings Visual inspection – Anything inconsistent Gasket surfaces – Fire rings, water ports Crack detection – Magnaflux, dye penetrant Flatness – .004” Go/No Go on deck surfaces Top side of OHC – Cam rotation
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Valve train inspection Valves Stem wear - .001” to .0015” Margins – 1/32” or ½ new thickness Necking on stems Tulip valve heads Straightness – When refacing
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Valve train inspection Valves Keeper groove wear Stem tip wear caused by rotator failure
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Valve train inspection Valve burning Starts with unequal cooling Warpage, then burning
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Valve train inspection Valve springs Pressure – 10% of spec in closed position Square – Within 1/16” for each 2” of length Pitting & corrosion
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