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 6-26. Repair
a. Pistons.
(1) Replace
pistons which are not within
limits specified in overhaul standards (table 6-
13).
(2) Replace pistons which are distorted,
cracked, worn, or abraded.
(3) Replace piston if oil holes in the ring
l a n d s cannot be cleared or if lands are damaged
or broken.
(4) Replace pistons that are badly burred,
n i c k e d , or scratched. Remove minor burs, nicks,
o r s c r a t c h e s f r o m p i s t o n s w i t h c r o c u s cloth
d i p p e d in dry-cleaning solvent or mineral spirits
paint thinner.
b. Piston Rings. Piston rings cannot be
r e p a i r e d . All piston rings must be replaced with
new rings at engine overhaul.
c. Piston Pins and Plugs. R e p l a c e p i s t o n p i n s
a n d plugs which are cracked, or have deep nicks
or scratches. Remove minor nicks or scratches
w i t h crocus cloth dipped in dry-cleaning solvent
or mineral spirits paint thinner. Replace piston
clearance.
pin plugs which have a large wear pattern on the
c. Install piston in bore of piston and install a piston pin
end. Replace piston pins and plugs not within
plug at each end of piston pin.
limits specified in overhaul standards (table 6-
d. Select pistons according to weight. Variations in the
weight of pistons in an engine should not exceed 0.5
13).
ounce.
6-27. Assembly
a. Check marking on new rings and install the
upper (tapered) compression ring and the two
i n t e r m e d i a t e compression rings with the marking
"UP" toward the piston dome. Install all rings
using remover and replacer - 5120-795-0177 as
shown in figures 6-44 and 6-45. Use care in
i n s t a l l i n g rings to avoid damaging ring lands or
distorting rings.
b. Measure side clearance of all new ring (fig.
not conform to limits specified in overhaul
standards (table 6-13).
6-50
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