TM-9-2815-205-24

6V53/6V53T ENGINES, DIESEL WITH CONTAINERS; MODEL 5063-5299, MODEL 5063-5392, MODEL 5063-5393 AND MODEL 5063-539L

TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE

FEBRUARY 2013

TM-9-2815-205-24 - Page 680 of 856

INSPECTION-ACCEPTANCE AND REJECTION CRITERIA

NOTE

Trunk piston can come in two configurations as shown. The new configuration has eight or

sixteen oil drain holes and J-relief. The old configuration has eight oil drain holes and no

J-relief. Either configuration is acceptable and matching throughout an engine is

not required.

1.

For piston, check cylinder liner and block bore for excessive out of round, taper, or high spots, which could

cause failure of piston (WP 0097).

NOTE

Overheating or burned spots on piston may indicate an obstruction in connecting rod

oil passage.

2.

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.

PISTON SUITABLE FOR

INSTALLATION.

PISTON SLIGHTLY SCORED.

USE ONLY AFTER REMOVING

SCORE MARKS BY POLISHING

WITH CROCUS CLOTH OR

HARD INDIA STONE.

PISTON BADLY SCORED-

UNFIT FOR USE.

MAINT_356

Figure 4.

Piston Inspection.

CAUTION

Do not polish or refinish piston pin. Hand polishing or refinishing will destroy precision

finish and result in rapid bushing wear.

3.

For piston pin, inspect for signs of fretting. Discard piston pin if fretting is present.

4.

Measure piston pin diameter. Diameter of new piston pin is 1.3746–1.3750 inches (34.915–34.925 mm).

TM 9-2815-205-24

0094

0094-6