TM 5-3805-262-34
4-1. ENGINE MAINTENANCE (CONT)
g. Pistons and confecting
Rods (CONT).
CLEANING
(1)
Break an old piston ring in half and use it to clean piston (3) ring
grooves.
(2)
Use a 0.156 inch diameter or smaller drill bit or fine wire to clean
piston (3) oil holes.
Dry cleaning solvent P-D-680 used to clean parts is toxic and flammable.
Wear protective goggles and gloves and use only in a well ventilated
area. Avoid contact with skin, eyes and clothes and don’t breathe
vapors . Do not use near open flame or excessive heat and don’t smoke
when using it. Failure to do so could cause serious injury. If you be-
come dizzy while using cleaning solvent, get fresh air and medical
attention immediately.
If contact with skin or clothes is made, flush
with
with
(3)
INSPECTION
(1)
(2)
(a)
(b)
(c)
large amounts of water. If contact with eyes is made, wash eyes
water and get medical aid immediately.
Clean all parts using cleaning solvent P-D-680. Dry using clean cloths.
AND REPAIR (SHEET 1 OF 2)
Measure and record piston pin (8) diameter using micrometer.
Measure inside diameter of bushing (9) using bore gage and micrometer
checking for wear. If inside diameter exceeds 1.6265 inches, press
bushing (9) from connecting rod
bushing:
Aline new bushing (9) oil
holes with connecting rod (2)
oil holes.
Using hydraulic press, press
bushing (9) into connecting
rod (2) until bushing is flush
with rod.
Using reamer, ream bushing (9)
0.0008 to 0.0014 inch larger
than piston pin (8) diameter
recorded above. If new piston
pin (8) is to be installed,
ream bushing to 1.6254 to
1.6258 inches.
new
(2) using hydraulic press. To install
4-46
