TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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Section V. OVERHAUL OF PISTONS, RINGS, AND PISTON PINS 6-22. General Overhaul standards of individual components This section covers the overhaul of the pistons, follow the inspection components. Refer to the following table (table 6-12) for applicable rings, and piston pins. Specific instructions on disassembly, cleaning, inspection, repair, and illustrations and instructions for overhaul operations. assembly accompany the overhaul operations. Table 6-12. Pistons, Rings, and Piston Pins Component Disassembly Cleaning Inspection Repair Assembly Piston Para 6-23 Para 6-24 Para 6-25a Para 6-26a Para 6-27 Figs. 6-44 Table 6-13 Figs. 6-46 and 6-45 Piston Rings through 6-44 Para 6-25b Para 6-26b Table 6-13 Piston Pins Para 6-24 Para 6-25c Para 6-26c Table 6-13 6-23. Disassembly a. Pistons. Disassemble pistons following instructions which accompany figures 6-44 and 6-45. Note. Before removing compression rings and oil control ring, check to see if they are free in piston grooves. Mark ring grooves of sticking rings for further detailed inspection. 1. Place jaws of remover and replacer - 5120-795-0177 in the end gap of upper piston ring (A). Spread ring, lift out of groove, and remove from piston. Discard piston ring. 2. Remove and discard two intermediate compression rings (B) and oil control ring in the same manner. Figure 6-44. Removing or installing piston compression rings using remover and replacer-5120-795-0177. Remove 1. Remove oil control piston ring expander spring (A) by separating at parting line as shown. Discard spring. Install 1. Install new oil control ring expander spring (A) in oil control groove of piston and join ends of spring together as shown. Figure 6-45. Removing or installing oil control piston ring expander spring. 6-47