TM5-6115-593-34NAVFAC P-8-631-34TO-35C2-3-463-2Figure 13-42. Head Capscrew Tightening Sequencec.Inspection.(1) Check valve seats and injector sleeve forcracks. Discard cylinder head if cracked.(2) Check all valve springs for damage.(3) Check for signs of metal erosion aroundwater holes.(4) Check cylinder head for worn or unevensurface at point of contact with gasket.(5) Examine fuse plug for signs of overheating.If plug shows signs of overheating, checkfor further damage and replace if necessary.d.Repair.(1) Replace any damaged valve springs.(2) Insert sleeves into water holes that havebecome enlarged due to metal erosion.Refer to paragraph 13-27 f.(3) Resurface head surface that is deeplyscratched or worn. Rework valve seat insertcounterbore by removing amount of stockequal to that removed during headresurfacing operations. Refer to paragraph13-27 f.(4) If exhaust ports are not flat, resurfaceexhaust ports. Exhaust ports should not bemore than 0.003 inch (0.08 mm).e.Overhaul.(1) Using a valve spring compressor, compressvalve springs (6), remove half collets (3),retainers (5), spring (6), valve spring guides(7), and guides (9).NOTEPerform the necessary tests to determinethe extent of overhaul or the scope ofrebuilding required to the cylinder head.(2) Hydrostatic Testing(a) Install injector sleeve holding tool or ascrap injector assembly in each injectorsleeve. Tighten tool or injector hold-down capscrews to 10 to 12 foot-pounds(14 to 16 joules) torque to seal lowerend of injector sleeve and place cylinderhead in the hydrostatic tester orequivalent.WARNINGOVERHEAD OPERATIONS HAVEINHERENT HAZARDS THAT CANNOT BEMECHANICALLY SAFEGUARDED. HARDHATS AND SAFETY SHOES AREREQUIRED.(b) Use hoist to position head and testerover13-80
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