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TM 5-4210-229-14&P 6-6. CYLINDER HEAD AND VALVES MAINTENANCE (Continued) (3) Test cylinder head pressure. (a)  Fabricate gasket as shown.  Use 1/8 inch 3 mm) rubber. (b)   Fabricate bottom pressure plate to cover water directors as shown.  Use 1/2 inch (1 3 mm) aluminum for a permanent plate or plywood of the same dimension for a temporary plate. (c)   Remove the valves and install injection nozzles. (d)   Attach fitting to thermostat housing with pressure gauge.  Run hot water at 10-12 psi (69-83 kPa) into head. (e)   Visually observe head for leakage at the injection nozzle sleeve flanges, upper deck, lower deck and all ports. (4)   Inspect lower deck for flatness. (a)    Use a straight edge long enough to span both length and width of head.  Follow checking pattern shown. (b) Insert feeler gauge under straight edge at each check point. (c) Replace cylinder head if 0.006 inch(0.15 mm) feeler gauge can be inserted under straight edge when checking the length or 0.004 inch (0.01 mm) feeler gauge can be inserted under straight edge when checking width. 6-7

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