TM 9-2320-365-34-220-3. CYLINDER HEAD REPAIR (CONT)d. Inspection (Combustion Surface and Top Deck).WARNINGFollow these general precautions whenever using these methods of crack detection toprevent personnel injury. Never shine the black light directly into the eyes. Do not smokeor eat while using inspection chemicals. Avoid getting chemicals on clothing. Avoidinhaling spray mist, airborne powder dust and solvent vapors. Provide adequateventilation. Store chemicals away from open flames and sources of heat. Failure tocomply may result in injury to personnel.NOTE• Fluorescent penetrant inspection, using a black light, is the most desirable procedure forinspecting components for indications of cracks. The high intensity black light and fluorescentchemicals will identify cracks not normally found with other methods.• Use one of the following three methods to check for cracks on the combustion chamber surface.• Metal spray process can be used to restore (build up) gasket contact surfaces to originaldimensions.(1) Liquid Fluorescent Inspection.NOTEBlack light and test kit shall be in accordance with overhaul contract requirements.(a) Thoroughly clean surface to be inspected.(b) Spray cleaner/remover fluid on cylinder head to remove any contaminants from surface to be checked.(c) Spray penetrant on surface to be inspected. Allow penetrant to remain on surface for five to 30 minutes. Thiswill allow penetrant to enter the smallest cracks.(d) Remove excess penetrant from surface.NOTEPenetrant can be removed by washing with water or by using moist and dry paper towels to wipesurface clean. Care should be taken not to overwash surface. Surface must be dry and free ofpenetrant. Check surface with black light to see if chemical has been removed.(e) Spray developer on dry surface. Coat entire surface with developer. Low pressure air can be used to improvedrying time. Once developer has been applied and is dry, a minimum developing time of ten minutes isrequired. During this time developer will draw penetrant out of cracks and to the surface.(f) Check surface with black light to highlight location of any damage. Black light should be measured to assurecorrect output of 800 micro watts per sq mm at the part surface, 15.0 in. (38.1 cm) away from 125 watt bulb.20-16
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