TM-9-2815-205-24 Technical Manual for M113 Engine 6V53 6V53T Download
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INSPECTION-ACCEPTANCE AND REJECTION CRITERIA - Continued NOTE Fit new or used piston to corresponding cylinder liner and retain as matched set for assembly in engine. 14. For fitting piston, using a micrometer set, measure piston skirt outside diameter (Figure 8, Item B) parallel to and perpendicular with piston pin bore at room temperature, 70° F (21° C). Skirt diameter for model 5063-5299 is 3.8699–3.8721 inches (98.3–98.35 mm). NOTE Thickness gages must be perfectly flat and free of nicks and bends. Select a thickness gage thickness requiring six pounds pull to move. Piston to liner clearance is 0.001 inch (0.025 mm) greater than thickness of thickness gage used. For example, a 0.004 inch (0.102 mm) thickness gage indicates 0.005 inch (0.127 mm) clearance when withdrawn with a six pound pull. 15. With cylinder liner (Figure 8, Item 1) in cylinder block, hold piston (Figure 8, Item 10) upside down in liner and measure clearance in four places, 90 degrees apart, using a thickness gage (Figure 8, Item 21) attached to a spring scale (Figure 8, Item 20). Clearance for model 5063-5299 must be 0.0027–0.0068 inch (0.069–0.173 mm) for new parts and to 0.010 inch (0.25 mm) for used parts. B B B B 90° 20 21 10 1 MAINT_360 Figure 8. Piston Fitting. 16. If binding occurs between piston and liner, remove piston and examine piston and liner for burrs. Remove burrs on piston with an X-fine sharpening stone. Remove burrs in liner with fine flat hone and recheck clearance. 17. For fitting piston rings, insert piston ring inside cylinder liner in normal area of ring travel. Using the piston, push ring down parallel with top of liner (Figure 9, Item 1). Measure ring gap with thickness gage. Repeat procedure for balance of compression and oil rings. TM 9-2815-205-24 0094 0094-10