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Page Title: REPAIR CYLINDER HEAD AND VALVE ASSEMBLY (Continued)
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TM 5-4320-308-13 5-2. REPAIR CYLINDER HEAD AND VALVE ASSEMBLY (Continued) 5 The cylinder contact surface of the cylinder head can be repaired by machining.  Remove up to a maximum of 0. 0196 inch (0.5 mm) of metal provided the minimum valve recession is maintained. 6 Replace any valves that show head warping, burning, or other damage. 7 Replace  valves  that  have  seriously  scratched  or  scuffed  stems,  or  pitted,  ridged,  or  cracked  tulips  faces,  or heads. 8 Replace valves that have a valve head diameter of less than 1.200 inch (30.5 mm). 9 Remove slight scratches or scuff marks. 10 If  the  cylinder  head  valve  seats  were  recut,  lap  the  valves  by  using  tool  604  581  00  and  600  grit  lapping  and grinding compound. 11    After lapping valves check valve recession. CAUTION The valve recession must not be less than 0.  018 inch (0.  45 mm), otherwise valve head may touch piston. The valve recession shall be a maximum of 0.  0275 inch (0.  70 mm) and a minimum of 0.  0180 inch (0.45 mm). TEST: 1 Insert valve (1) into cylinder head (2). 2 Install cap (3) over valve (1) stem. 3 Install washer (4) on cap (3). 4 Install spring (5) on washer (4). 5 Insert cup (6) into spring (5). 6 Install two collets (7) into cup (6) and over valve (1) stem. 7 Press   down   on   collets   (7)   and   cup   (6)   until spring (5) compresses and collets (7) are locked in slot in valve (1) stem. 5-4

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