VALVES, CAMSHAFT, AND TIMING GEARS (CONT)

VALVES, CAMSHAFT, AND TIMING GEARS (CONT) - TM-5-4320-300-14_452

TM-5-4320-300-14 Pump Centrifugal Self-Priming Gasoline Engine Driven; 6-Inch 1500 GPM Capacity At 60 Foot Head Manual
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TM 5-4320-300-14 6-9. VALVES, CAMSHAFT, AND TIMING GEARS (CONT) Location/Item Action Remarks CAUTION Equipment damage may occur if grinding wheels make contact with cyl- inder head. Grind valve seat inserts as true as possible. 37. Valve seat Install a 31 degree grinding wheel in valve seat The 31 degree face insert insert grinder and apply the wheel to the insert. of the insert may be adjustment Remove 31 degree grinding wheel from grinder adjusted relative to and install a 60 degree grinding wheel. Apply the center of the wheel to insert to open throat of insert. Grind top valve face with the surface of insert with a 15 degree wheel to narrow 15 degree and 60 the seat width to a range between 0.04688 and degree grinding 0.07813 inch (1.1908 and 1.9845 mm). wheels. WARNING Severe burns, illness, or death may result if personnel fail to handle diesel fuel properly. Observe the following precautions: Do not inhale vapor. Do not refuel near open flame, sparks, or excessive heat. Be certain fuel lines and connections are secure. Work in a well-ventilated area. 38. Concentricity Clean the valve seat insert check thoroughly with VV-F-800 diesel fuel and dry it with compressed air. Set con- centricity dial indicator in position and rotate it to determine the concentricity of each valve seat insert relative to the valve guide. If runout exceeds 0.002 inch (0.0508 mm), inspect valve guide for bend. If valve guide is not bent, regrind insert. 6-69

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