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 TM 55-1905-223-24-3
(3)
Steam clean the pistons and dry with compressed air.
(4)
Visually inspect the piston bowl, pin bore, and skirt for cracks or damage. Replace damaged
parts as required.
NOTE
Do not use pistons with dome cracks.
(5)
Use the piston ring groove wear gauge ST-560 to inspect the top and second grooves.
NOTE
The widest part (shoulder) of the tool must not come in contact with the piston.
Replace the piston if the shoulder touches the piston.
(6)
Hold a new ring in the groove. Install a 0.006 inch (0.152 mm) feeler gauge. If the feeler
gauge enters the groove without resistance, there is too much wear. Replace the piston.
(7)
Measure the outside diameter of the piston a follows:
s
(a) Measure at right angles to the piston pin bore.
(b) Piston temperature must be between 70 (21 ) to 90 (32 ).
F
C
F
C
(c) Replace piston that measure less than 5.483 inches (139.27 mm) outside diameter.
(8)
Measure the piston pin bore inside diameter when the piston temperature is 68 F (20 C).
It
should be between 1.9985 inches (50.762 mm) and 2.0000 inches (58.8 mm).
NOTE
Add 0.0005 inch (0.013) to the bore inside diameter per 10 (5 )
F
C
temperature rise up to 90 (32C).
F
(9)
Inspect the piston pin for scratches, grooves, or other damage. Replace the pin if damage.
(10)
Measure the piston pin outside diameter. It must be between 1.9985 inches (50.762 mm)
and
1.9990 inches (50.775 mm).
(11)
Discard the piston pin if it is more than 0.001 inch (0.03 mm) out-of- round.
4-78
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