SERVICE MANUALCYLINDER HEAD & VALVESSection 3GENERALThese engines are the overhead valve type with twovalves per cylinder. All turbocharged engines are builtwith "STELLITE" exhaust valves, which have specialwear characteristics.NOTE:DO NOT use an exhaust valve from anaturally aspirated engine in a turbocharged engine.non-stellite exhaust valves are used in naturallyaspirated engines.VALVE ROTATORS are used on all valves to prolongvalve life.The VALVE ARRANGEMENT in the cylinder head isintake-exhaust, intake-exhaust and so on, starting fromthe front of the engine.The exhaust VALVE FACE ANGLES are ground at 45degrees and the intake at 30 degrees.400 SERIES engines use valve seat inserts on both theintake and exhaust valves.The VALVE LEVER and SHAFT ASSEMBLY is mountedto the cylinder head. The valve lever shaft is lubricatedfrom a drilled passage in the crankcase through the rearstud hole of the cylinder head.Valve levers and valve lever shaft are subject to frictionalwear and hammering. During engine overhaul checkthese parts against "Specifications". Correct installationof valve lever shaft is important to valve train lubrication.The Cylinder Head Is Identified as follows:NATURALLY ASPIRATED ENGINES have a recessedletter "H" cast into the intake manifold side of the cylinderhead, which designates "High Swirl."Figure 2. - "H" (High Swirl)TURBOCHARGED ENGINES (except "B"& "C" Series)have NO markings, which designate "Low Swirl."Figure 3. - No Markings (Low Swirl)TURBOCHARGED "B" & "C" SERIES ENGINES have arecessed cross "+" cast into the side of the cylinderhead, which designates "Intermediate Swirl."Figure 4. - "+" (Intermediate Swirl)CGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 2
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