Figure 13-48. Piston Check Points

TM-5-6115-593-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 600 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 nuts that have distorted threads. (m) Check bolt hole diameter. If diameter exceeds 0.6249 inch (15.872 mm), discard rod. (n) Check bolt pad radius. (4) Piston rings. (a) New rings should be checked in cylinder liner in which they are to be used to make sure the gaps are correct. (b) Insert each ring in mating cylinder liner; position with head of piston so it is seated squarely in ring travel area of liner. (c) Measure ring gap with a feeler gauge. Gap should fall within limits specified in Chapter 1. (d) Do not file or stone chrome-plated rings; be certain top and intermediate rings are installed in chrome plated cylinder liners. (5) Piston and piston pin. (a) Check top and second piston ring grooves with a segment of new ring and a feeler gauge. Hold ring in groove, flush with land and insert 0.006 inch (0.15 mm) feeler gauge; if gauge enters groove without forcing or disengaging ring, wear is excessive and piston should not be used. (b) Measure piston skirt diameter with a micrometer at right angle to piston bore (A, figure 13-48 for the barrel-ground pistons), measure straight or tapered ground pistons at point B, 1 inch (25.4 mm) below ring groove and C, 1 inch (25.4 mm) above bottom of piston. Pistons should not be reused if worn more than indicated in Chapter 1. (c) Pistons should be checked at room temperature of 70 to 90°F (21 to 32°C); refer to tabulated data in Chapter 1. (d) Piston pin bore check at 70F (21°C) should fall within limits specified in table 13-2; add 0.005 inch (0.013 mm) per 10F (-12°C) up to 90F (32C). Figure 13-48. Piston Check Points (e) Check piston pin outside diameter with micrometer. Pins should not be reused if out-of-round more than 0.001 inch (0.03 mm) or worn smaller than indicated in Chapter 1. c. Installation. Refer to figure 13-47 and proceed as follows: (1) Insert one snap ring (9) in piston pin bore. (2) Heat piston in water or an oven to 220F (104C) for 5 minutes. (3) Insert piston pin (9) through piston and rod by hand. Lock pin in place with second snap ring. (4) Assemble rings to pistons 13-92

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