FIGURE 5-37. CYLINDER MEASUREMENT POINTS

TM-5-4310-393-14 Air Compressor Diesel Engine Driven 20 CFM 3200 PSI Model KA7-DA Manual
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TM 5-4310-393-14 c. Clean cylinder seat in crankcase (Figure 5-36, Item 2) with dry cleaning solvent and dry with low pressure compressed air. Check that cylinder seat is smooth and flat. d. Clean cylinder thoroughly with dry cleaning solvent Dry with low pressure compressed air. Inspect for warpage, roundness, damage, rust or corrosion. If any of these conditions are found, replace with new cylinder and piston. NOTE For piston replacement instructions, refer to paragraph 5-6.6. e. Inspect cylinder for cracks. f. Inspect for scoring, glazing, or ridge on the upper portion of inner surface g Inspect for metal particles (fretting) on outer surface. h. Measure cylinder bore at (Figure 5-37), levels 1 to 4 of engine centerline axis "A" and crossline axis "B". A normal or new bore diameter should be 2.8740 to 2.8744 inches (73 00 to 73.01 mm) If wear limits for a normal bore cylinder have been reached. or exceeded, replace cylinder and piston. If measurements on axis "A" and "B" are different, cylinder is out of round or has high spots. Replace cylinder and piston Refer to Table 5-3 FIGURE 5-37. CYLINDER MEASUREMENT POINTS i. Check that top and bottom faces of cylinder are smooth and flat If damaged, replace cylinder and piston. B. Replacing/Reinstalling the Cylinder. CAUTION If a new cylinder is installed, use a new piston and rings also. If working on more than one unit at the same time, ensure that if the cylinder is reinstalled, the original piston is used with it in the same orientation as when removed. Always use a piston and cylinder as a matched pair. WARNING DEATH OR SERIOUS INJURY COULD OCCUR IF FUEL IS NOT HANDLED CAREFULLY. USE IN A 5-29

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