TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
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TM 9-2815-220-24 PISTONS, RINGS, AND ASSOCIATED PARTS REPLACE/REPAIR 0142 00 INSPECTION (Continued) 7. Visually inspect piston rings. a. Look for scuffing, scoring, chipping, scratches or abrasions. Pay particular attention to rings that were found to be sticking in the piston ring grooves. b. Replace any rings that are scuffed, scored, chipped, or abraded. NOTE The width of the top piston ring cannot be accurately measured. When ring is installed in fixture, the end gap is the only measurement for the top ring. 8. Measure the width of intermediate compression rings (2) and oil control ring (3). Replace rings that do not meet the following limits. Location Sizes and Fits of New Parts inches (mm) Wear Limits 2 (Compression ring width) 0.0925 (2.3495) 0.0935 (2.3749) None 2 (Clearance when installed in second (A) ring groove) 0.0055L (0.1397L) 0.0075L (0.1905L) 0.0110 (0.2794) 2 (Clearance when installed in third (B) ring groove) 0.0045L (0.1143L) 0.0065L (0.1651L) 0.0100 (0.254) 3 (Oil control ring width) 0.1855 (4.7117) 0.1865 (4.7371) None 3 (Clearance when installed) 0.0015L (0.0381L) 0.0035L (0.0889L) 0.0055L (0.1397L) NOTE Clearances (A and B) will be measured with a thickness gauge at assembly. B A 2 2 3 WP 0142 00-8