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TM 10-3930-643-34
GENERAL SUPPORT ENGINE, FUEL, EXHAUST AND COOLING MAINTENANCE. (cont)
13-8.
Pistons, Connecting Rods and Connecting Rod Bearings. (Sheet 8 of 12)
CLEANING/INSPECTION (cont)
20•
21.
22.
23.
24.
25.
26.
27.
28.
Push new rings (6 and 7) down into
cylinder sleeve with the top of a
piston positioning ring squarely in
the sleeve.
Using a feeler gage, measure ring
gap.
Replace ring if gap is too
wide.
File ring to
specification.
Ring (6) gap should be between 0.010
and 0.029 inches.
Ring (7) gap
should be between 0.020 and
0.033
inches for narrow gap
and between
0.065 and 0.078 inches for wide gap.
Inspect pin (10) and replace if worn,
etched or corroded.
Inspect two bolts (1) for nicks or
thread damage, replace if necessary.
NOTE
Rods have a special rolled thread.
Do no retap rods.
Lubricate thread of two bolts
(1)
with SAE 30 engine oil.
Screw two
bolts (1) into connecting rod (4)
face by hand.
If two bolts (1) does
not screw into connecting
rod (4)
freely, replace connecting rod (4).
Using a
micrometer,
measure
and
record the three inside diameters of
each rod at points “A”, “B” and “C”.
Inspect two bearing halves (3) for
deep scratches, wear or burned areas.
Insert two bearing halves (3) into
connecting rod (4) and cap (2).
Check crank pin diameter of
crankshaft, refer to paragraph 13-4.
Go to sheet 9
13-56
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