CYLINDER HEAD & VALVES - CONT - TM-5-3820-256-24-5

CYLINDER HEAD & VALVES - CONT - TM-5-3820-256-24-5_197

CYLINDER HEAD & VALVES - CONT - TM-5-3820-256-24-5_199

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL CYLINDER HEAD & VALVES Section 3 3. Inspect lower deck for flatness. a. Use a straight edge long enough to span both length and width of HEAD. Follow checking pattern shown below. Figure 18. - Cylinder Head Checking Pattern- b. Insert feeler gauge under straight edge at each check point. c. Resurface HEAD if 0.15 mm (0.006 in.) feeler gauge can be inserted under straight edge when checking the length or 0.01 mm (0.004 in.) feeler gauge can be inserted under- straight edge when checking width. NOTE: SUDDEN CHANGE IN CONTOUR SUCH AS SCRATCHES, GOUGES ETC. MUST NOT EXCEED 0.05 mm (0.002 in.) IN DEPTH. 4. Cylinder head resurfacing procedure. a. With a micrometer, measure distance from upper deck (valve cover seating surface) to lower deck (head gasket contact surface). As shown in Fig. 19. Minimum Allowable Deck to Deck Dimension 106.38 mm (4.188 in) Figure 19. - Measuring Cylinder Head b. DO NOT grind more than 0.25 mm (0.010 in) stock or go below the minimum allowable deck to deck dimension, or a cracked head at the lower deck may result. c. After head resurfacing, grind valve seats so installed valves meet valve recession specifications of: 0.00 mm (0.000 in) 0.36 mm (0.014 in) d. With valve assemblies installed, measure valve recession as shown in Fig. 20. Figure 20. - Measuring Valve Recession e. Replace valve seat inserts if valve recession exceeds maximum specifications. CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 18

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