SERVICE MANUALCYLINDER HEAD & VALVESSection 3MEASURE VALVE SPRING FREE LENGTHa.Free Length: 59.4 mm (2.34 in.)b.Insert valve spring into spring test loader,as shown in Fig. 33.MEASURE MAXIMUM SPRING LENGTH IN USE(VALVE CLOSED)c.Maximum length in use:50.98 mm@294 to311N(2.007 in)(66 to 70 lbs.)MEASURE MINIMUM SPRING LENGTH IN USE(VALVE OPEN)d.Minimum length in use:39.42 mm694 to 730 N(1.552 in.)@ (156-164 lbs.)4.Replace any spring which is rusted, pitted,cracked or incapable of meeting tensionrequirements set forth.NOTE:Valve spring tension can be tested in aspring tester or while assembled on the engine.Figure 33. - Testing Valve SpringsInspect Valve Spring Locks as follows:1.Clean valve spring locks in a suitablesolvent.2.Check inside ribs of lock for wear whichmay cause looseness.3.Check outside of locks for wear whichmight allow valve spring retainer to slideover lock.NOTE:Wear on outside surface of locks can becaused by overspeeding engine.4.Replace any worn locks.Inspect Valve Rotators (Roto Coil) as follows:1.To properly test the rotator for function, avalve spring load must be applied to therotator.2.Place the valve spring, with the roto coil, inthe spring tester. Place a bearing ballbetween the roto coil and ram of the springtester, as shown in Fig. 30.3.Compress valve spring and observe rotocoil as it turns counterclockwise.4.Replace any roto coil which does NOT turn.5.Check oil seal (if equipped) for wear andreplace if necessary.CGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 25
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