TM 5-4310-387-14
6-11. Second Stage Piston and Connecting Rod Assembly.
This task covers:
a.
Replace
b.
Repair
INITIAL SETUP
Tools
General Mechanic's Tool Kit (NSN 5180-00-177-7033)
Caliper Set (NSN 5210-00-554-7134)
TSP Ultrasonic Cleaner (NSN 4940-00-164-8997)
Pliers, Retaining Ring (NSN 5210-00-789-0492)
Materials/Parts
Preformed Packing
Gasket
Retaining Rings
Piston
Piston Rings
Rags, Wiping (Item 19, Appendix E)
Bands, Rubber (Item 4, Appendix E)
Materials/Parts (Cont)
Bags, Plastic (Item 3, Appendix E)
Tape, Pressure Sensitive (Item 22, Appendix E)
Equipment Condition
First stage cylinder removed (para. 6-8).
Second stage cylinder removed (para. 6-10).
Third stage cylinder removed (para. 6-12).
Fanwheel removed (para. 5-36).
References
Cleaning Procedures, Chapter 4, Section VI.
Appendix F Torque Values.
a.
Replace. (figure 6-5)
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.
(1) Remove four screws (1), washer (2), plate (3), and gasket (4). Discard gasket (4).
(2) Remove two screws (5), plate (6), and oil pump cam (7).
(3) Remove two retaining rings (8), wrist pin (9), and piston assembly (10). Discard retaining rings (8).
(4) Remove first stage piston assembly (para. 6-9).
(5) Remove third stage crosshead assembly (para. 6-13).
6-22
