TM 5-4310-387-14
6-9. First Stage Piston and Connecting Rod Assembly (Cont).
(6)
Remove six bolts (11) and washers (12).
(7)
Remove housing (13) and preformed packing (14). Discard preformed packing (14).
(8)
Remove crankshaft (15), balance weight (16) and bearing (17).
(9)
Remove bearing (17) from crankshaft (15).
(10)
Remove nut (18), washer (19), bolt (20), and balance weight (16).
(11)
Note orientation of connecting rods (21), (22), and (23) and remove from crankshaft (15).
(12)
Install three connecting rods (23), (22), and (21) in the same position as noted during removal.
(13)
Install balance weight (16) and secure with bolt (20), washer (19), and nut (18).
(14)
Install bearing (17).
(15)
Install crankshaft (15), counterweight (16), and bearing (17).
(16)
Install housing (13) and new preformed packing (14) and secure with six bolts (11) and washers (12).
(17)
Install piston (10), wrist pin (9) and two new retaining rings (8).
(18)
Install oil pump cam (7) and secure with plate (6) and two screws (5).
(19)
Install new gasket (4) and plate (3) and secure with four screws (1) and washers (2).
FOLLOW-ON MAINTENANCE
(1)
Install third stage cylinder (para 6-12).
(2)
Install second stage cylinder (para 6-10).
(3)
Install first stage cylinder (para 6-8).
(4)
Install fanwheel (para 5-36).
b. Repair. (figure 6-3)
(1)
Remove first stage 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 two tapered piston rings (1), one scraper piston ring (2), and plain ring (3).
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