ARMY TM 9-6115-670-14&P 6-59 6.24. PISTON RINGS. This task covers: a. Test b. Replace INITIAL SETUP ToolsGeneral Mechanic's Tool Kit (Item 1, Appendix B) Piston Ring Expander (Item 40, Appendix B) Piston Compressor(Item 41, Appendix B) EquipmentConditionsPistons removed from cylinder (para 6.22.). Materials/PartsPiston Rings TEST a. Remove piston ring from piston (perform step a of REPLACE). b. Test piston ring gap. (1) Use piston compressor and piston to insert compression ring 1 into the least worn out part of the cylinder. (2) Measure the ring gap. (3) If gap exceeds 0.0472 in. (1.2 mm), replace ring. (4) Perform step 1 with compression ring 2 and measure ring gap. (5) If gap exceeds 0.0472 in. (1.2 mm), replace ring. NOTE Ensure that piston rings are reinstalled on same piston from which they were removed from (Figure 6-21, Sheets 3 and 4).
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