TM 10-4320-310-145-10.INSPECT/REPLACE CYLINDER HEAD AND VALVE ASSEMBLY (Continued)CLEANING/INSPECTION:.Dry cleaning solvent P-D-680 (safety or Stoddard's Solvent) is potentiallydangerous. Avoid repeated and prolonged breathing of vapors and skincontact with the liquid. Do not use near open flame, arcing equipment, orother Ignition sources. Always wear eye protection and protective clothing.The flash point of P-D-680 Is 100°F to 138°F (38°C to 59°C).Death or serious injury could occur if compressed air Is directed against theskin. Do not use compressed air for cleaning or drying unless the pressureIs/has been reduced to 30 psi (2.06 bar) or less. When working withcompressed air always use chip guards, eye protection, and other personalequipment.1Clean all parts with a clean cloth dampened with dry cleaning solvent. Use wire brush where necessary. Dry withcompressed air.2Inspect all parts for cracks, rust, corrosion, and excessive heat damage.3Inspect for accumulated carbon around injector seat in cylinder head.4Replace cylinder head if it is damaged.5Measure rocker shaft (1) diameter. If rocker shaftdiameter is smaller than 0.7074 inch (17.967 mm), Rmust be replaced.6Measure rocker bore bushing (2) inside diameter. Ifrocker bore bushing inside diameter is greater than0.7076 inch (17.974 mm), replace bushing (2).7Inspect rocker (3) radius. No flattening or brinelling is permitted on the rocker radius. If there is evidence offlattening, the rocker must be replaced.NOTEWhen replacing rocker (3) you must also replace bushing (2). They arereplaced as an assembly. Bushing (2), however, can be replaced separately.8Inspect valve seats in cylinder head. If there is any evidence of damage, replace the cylinder head.NOTEWhenever a valve is replaced, the valve seat must be reconditioned.9Inspect valves. If there is any evidence of damage or distortion, replace valve and recondition valve seat.5-20
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