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

  TM-9-2815-205-24 - Page 706 of 856

INSPECTION-ACCEPTANCE AND REJECTION CRITERIA - Continued
NOTE
Fit new or used piston skirt to corresponding cylinder liner and retain as a matched set for
assembly in engine.
12.
Using micrometer set, measure piston skirt outside diameter (Figure 7, Item B) parallel and perpendicular to
piston pin bore at room temperature 70°F (21°C). Diameter must be 3.8695–3.8717 inches
(98.285–98.341 mm).
NOTE
Thickness gage must be perfectly flat and free of nicks and bends.
Select thickness gage thickness requiring six pounds pull to move. Piston to liner
clearance will be 0.001 inch greater than thickness of thickness gage used. For
example, a 0.004 inch thickness gage indicates 0.005 inch clearance when
withdrawn with a six pound pull.
13.
With cylinder liner (Figure 7, Item 1) installed in cylinder block, hold piston skirt (Figure 7, Item 18) upside
down in liner and check clearance in four places, 90 degrees apart, using a thickness gage
(Figure 7, Item 27) attached to spring scale (Figure 7, Item 26). Clearance must be 0.0035–0.0072 inch
(0.089–0.183 mm) with new parts and a maximum of 0.012 inch (0.30 mm) for used parts.
14.
If binding occurs between piston and liner, remove piston and examine piston and liner for burrs. Remove
burrs on skirt with X-fine sharpening stone. Remove burrs in liner with fine flat hone and recheck clearance.
B
B
B
B
90°
26
27
18
1
MAINT_377
Figure 7.
Fitting Piston.
15.
Insert top piston ring inside cylinder liner (Figure 8, Item 1) in normal area of ring travel. Using piston skirt,
push ring down parallel with top of liner. Measure ring gap with piston-liner thickness gage set. Refer to
Table 2 for specifications. Repeat procedure for balance of compression and oil rings.
Table 2.
Piston Ring Specifications.
MINIMUM
MAXIMUM
RING GAP
Fire Ring
0.0230 in. (0.584 mm)
0.0380 in. (0.965 mm)
TM 9-2815-205-24
0095
0095-10


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