b. Repair. - TM-5-4310-387-14

Figure 6-5. Second Stage Piston and Connecting Rod Assembly, Replace

Figure 6-6. Second Stage Piston and Connecting Rod Assembly, Repair.

TM-5-4310-387-14 Compressor Unit Diesel Engine Driven 20 CFM 3200 PSI Model K-20-D Manual
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TM 5-4310-387-14 6-11. Second Stage Piston and Connecting Rod Assembly (Cont). (10) Install connecting rod (23), new connecting rod (22), and connecting rod (21) on crankshaft (15) in the same position as noted during removal. (11) Install balance weight (20) and secure with bolt (19), washer (18), and nut (17). (12) Install bearing (16) and crankshaft (15). (13) Install new preformed packing (14) and housing (13) and secure with six bolts (11) and washers (12). (14) Install piston assembly (10) and secure with wrist pin (9) and two new retaining rings (8). (15) Install first stage piston assembly (para. 6-9). (16) Install third stage crosshead assembly (para. 6-13). (17) Install oil pump cam (7) and secure with plate (6) and two screws (5). (18) Install new gasket (4) and plate (3) and secure with four screws (1) and washers (2). FOLLOW-ON MAINTENANCE (1) Install first stage cylinder (para. 6-8). (2) Install second stage cylinder (para. 6-10). (3) Install third stage cylinder (para. 6-12). (4) Install fanwheel (para. 5-36). b. Repair. (figure 6-6) (1) Remove piston and connecting rod assembly (para.a.). WARNING Cleanliness is imperative in maintaining and handling diving air system components. All tools and parts must be kept free of oil, grease, rust, or other contamination in accordance with Chapter 4, Section VI of this manual. Foreign substances within an assembly could result in equipment failure and possible injury or death to personnel. Ensure that all air lines and components removed or openings into the air system that provides breathing air are covered with a plastic bag and secured with a rubber band or taped shut. Small components should be stored in a plastic bag and sealed. Failure to do so will cause air system to become contaminated and could result in injury or death to the diver. (2) Remove three tapered rings (1) and one plain piston ring (2) from piston (3). (3) Inspect piston (3) and replace if scored or measurements taken 900 apart on piston differ by more than 0.03 in. (.762 mm) or diameter of piston (3) is less than 1.4173 in. (36 mm). 6-24

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