TM-9-2815-205-34

ENGINE WITH CONTAINER; MODELS 5063-5299, 5063-5392, 5063-5393, 5063-5395, 5063-5398, 5063-539F, 5063-539L

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

AUGUST 1992

TM-9-2815-205-34 - Page 313 of 596

TM 9-2815-205-34

(b)

(d)

(e)

Examine piston for score marks,

cracks, damaged ring grooves, loss of

tin plating, or indications of

overheating. Using a crocus cloth,

remove light score marks from piston.

Replace any piston severely scored or

overheated. Discard piston if cracks

are found across internal struts.

(2) Piston Pin

CAUTION

Do not polish or refinish piston

pin. Hand polishing or refinish-

ing will destroy precision finish

and result in rapid bushing

wear.

(a)

(b)

Inspect piston pin for signs of fretting.

Discard piston pin if fretting is present.

Measure piston pin diameter.

Diameter of new piston pin is 1.3746

to 1.3750 inches.

(3) Connecting Rod

(a) Check connecting rod for visual damage. Discard if rod is bent, had previous bearing

failure, was overheated (blued) at top or bottom end, or is fretted at split line between rod

and cap.

(b) Check for cracks using the magnetic particle inspection method (reference MlL-C-1949).

NOT E

Overheated bushings may become loose and creep together, thus blocking off supply

of lubricating oil to piston pin and spray nozzle.

(c) Check connecting rod bushings for indications of scoring, overheating, or other damage.

Compressed air used for cleaning purposes will not exceed 30 PSI. Use only

with effective chip guarding and personal protective equipment (goggles/shield,

gloves, etc.)

Check spray nozzle at upper end of connecting rod for plugged holes. Blow compressed air

through drilled oil passage in rod to ensure spray nozzle holes are open.

Inspect connecting rod bearing bores for burrs or foreign particles, Clean up minor burrs

with crocus cloth using circular motion.

3-183

WARNING