INSPECTION/REPLACEMENT/REPAIR - CONTINUED

TM 9-2320-269-34-1

PISTONS AND CONNECTING RODS - CONTINUED

ACTION

LOCATION

ITEM

REMARKS

INSPECTION/REPLACEMENT/REPAIR - CONTINUED

33.

Piston (1) and

To figure piston-to-bore clearance,

cylinder block

subtract piston diameter measurement

bore (2)

from bore inside diameter measure-

ment.

Normal piston-to-bore clearance

for

new parts is 0.006 to 0.007 Inch

(0.15 to 0.18 mm).

Using thickness gage free of nicks and

bends, and spring scale, check piston-

to-bore clearance in four places,

90 degrees apart, while holding piston

(1) upside down in bore.

Actual clearance is 0.001 inch

(0.0254 mm) greater than

thickness

of gage that can be withdrawn

from

between piston (1) and bore (2)

with

a 6 lb (2.7216 kg) pull.

CAUTION

Do not try to change the gap clearance of chrome faced rings by filing the ends of the rings. Chrome plating

will be damaged.

NOTE

Always use new piston rings whenever a piston has been removed for inspection or replacement.

34.

New piston

Check ring gap In cylinder bore (2) by

rings (3)

Inserting rings (3) one at a time Into

cylinder bore (2), pushing ring down far

enough to be in normal area of ring

travel, and using top of piston (1) to

keep ring (3) parallel with top of

bore (2).

Using thickness gage, measure ring gap

between ends of ring (3).

See Repair and Replacement

Standards (page 1-6) for ring gap

limits.

2-150