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TM 10-3930-660-34
3-15.
CONNECTING RODS AND BEARINGS - REPLACE (Cont’d)
INSPECTION
1.
VISUALLY INSPECT CONNECTING RODS (6) FOR
DAMAGE OR OBVIOUS WEAR.
2.
CHECK I-BEAM SECTION (9) OF CONNECTING
RODS (6) FOR DENTS OR OTHER DAMAGE. ANY
DAMAGE IN THIS AREA CAN CAUSE STRESS
WHICH WILL LEAD TO BREAKAGE.
3.
MEASURE I.D. OF PISTON PIN BORE IN
CONNECTING ROD (6), AT FOUR POINTS AS
SHOWN, TO CHECK FOR WEAR. TAKE AVERAGE
OF ALL READINGS. AVERAGE READING MUST
NOT EXCEED RANGE FROM 1.5769 TO 1.5784
INCH.
4.
CHECK ROD BEARING CLEARANCE.
a.
Assemble connecting rod (6), rod
bearings (5) and cap (2).
b.
Install capscrews (4) and tighten
to 73 lb. ft.
c.
Record smallest diameter measured at various
points around bore.
d.
Measure and record mean diameter of rod journal
on crankshaft (10). Take four readings on each
journal at points noted.
e.
Subtract rod journal mean diameter, STEP d,
from smallest rod bearing diameter, STEP c, to
determine rod bearing clearance.
NOTE
Maximum allowable rod bearing clearance is 0.0035 inch.
Select required undersized bearing set to compensate
for excessive rod bearing clearance.
3-101
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