TM-5-2815-241-34-P

ENGINE, DIESEL NTC-290

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT, MAINTENANCE (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)

MARCH 1987

TM-5-2815-241-34-P - Page 244 of 738

TM 5-2815-241-34&P

PISTON AND CONNECTING ROD - CONTINUED

ACTION

LOCATION

ITEM

REMARKS

CLEANING/INSPECTION

NOTE

For general cleaning procedures, see General Maintenance Instructions, page 2-3.

Pistons should be inspected at ambient temperatures of 70° to 90°F (2° to 32°C).

7.

Piston (1)

a.

Inspect wear surface for scoring, scuf-

fing, and cracks.

If scoring, scuffing, or cracks exist,

discard piston.

b.

Inspect piston pin bore (2) for fractures.

If fractures exist, discard piston.

c.

Using ST-560 ring groove gage (3)

check top and second ring groove lands

(4) depth for wear.

If shoulders of gage (5) touch ring

groove lands (4), discard piston.

d.

Using dial bore gage, measure piston

pin bore (2) Inside diameter.

If piston pin bore (2) exceeds 1.999

inch (50.775 mm) at 70°F (21°C)

discard piston. Add 0.0005 inch

(0.013 mm) per each 10°F (5.5°C)

over 70°F.

TA 242488

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