FIGURE 5-39. PISTON

TM-5-4310-393-14 Air Compressor Diesel Engine Driven 20 CFM 3200 PSI Model KA7-DA Manual
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TM 5-4310-393-14 CAUTION When removing cylinder, make sure piston or connecting rod does not knock against crank-case. This could result in serious damage to piston or connecting rod. a. Remove retaining ring (Figure 5-39, Item 1). b. Press out piston pin (2) far enough to remove piston pin (2) and piston (3) from connecting rod (4). FIGURE 5-39. PISTON NOTE The piston pin can be moved by hand if the engine parts are warm. If the engine has al-ready cooled down, heat the piston to 122° F (50° C). If this is not possible, the piston pin can be knocked out. A suitable object must be held against the opposite side of the piston to avoid bending the connecting rod. c. Remove piston (Figure 5-39, Item 3) and piston pin (2). d. Remove retaining ring (5). CAUTION Piston rings may be broken if rings are opened more than necessary when removing or installing them. Do not strain rings. e. Remove piston ring set (Figure 5-40, Item 1) from piston (2). FIGURE 5-40. PISTON RINGS 2. Cleaning the Parts for Inspection WARNING DRY CLEANING SOLVENT P-D-680 (SAFETY OR STODDARD'S SOLVENT) IS POTENTIALLY DANGEROUS. AVOID REPEATED AND PROLONGED BREATHING OF VAPORS AND SKIN CONTACT WITH LIQUID. DO NOT USE NEAR OPEN FLAME, ARCING EQUIPMENT, OR OTHER IGNITION SOURCES. ALWAYS WEAR EYE PROTECTION AND PROTECTIVE CLOTHING. THE FLASH POINT OF P-D-680 IS 100 TO 138 DEGREES F (38 TO 59 DEGREES C). WARNING DEATH OR SERIOUS INJURY COULD OCCUR IF COMPRESSED AIR IS DIRECTED AGAINST THE SKIN. DO NOT USE COMPRESSED AIR FOR CLEANING OR DRYING UNLESS THE PRESSURE HAS BEEN REDUCED TO 30 PSI (2.06 BAR) OR LESS. WHEN WORKING WITH COMPRESSED AIR ALWAYS USE CHIP GUARDS, EYE PROTECTION, AND OTHER PERSONAL EQUIPMENT. 5-32

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