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TM 9-2815-220-24
CRANKSHAFT MAIN BEARINGS INSPECTION
0138 00
INSPECTION (Continued)
8. Tighten main bearing cap (6,7) nuts (11).
a. Make sure that nuts (11) are loose, then
measure and record the height of four
main bearing cap (7) studs (15) at
number 4 location. Use a flat surface
16
plate (16) and dial indicator (17)
(item 65, WP 0176).
17
b. At number 4 main cap (7), in a
15
11
crosshatch pattern, torque-tighten four
slotted nuts (11) to 42 foot-pounds
6,7
(57 Nm) using torque wrench (item 127,
WP 0176). Using the same crosshatch
pattern, torque-tighten the same four
nuts (11) to 58 foot-pounds (79 Nm).
c. Using a flat surface plate (16) and dial
indicator (17) (item 65, WP 0176),
measure and record the height of four
main bearing cap studs (15) at number 4
location. Subtract the first reading from
the second, this is the stud stretch.
d. Tighten nuts (11) to attain a stretch of 0.019 to 0.024 inch (0.4826 to 0.6096 mm).
e. Any stud that exceeds the maximum stretch (0.024 inch, or 0.6096 mm) prior to the nut
obtaining minimum torque (58 foot-pounds, or 79 Nm) must be replaced.
f. Any stud that its nut reaches maximum torque (69 foot-pounds, or 94 Nm) prior to
obtaining minimum stretch (0.019 inch, or 0.4826 mm) may be loosened and tried again.
Loosening of a single nut is not allowed; all nuts on that bearing cap must be loosened. If
the condition exists after the second try, the stud must be replaced.
g. Repeat for remaining caps in the following order: 3, 5, 2, 6, 1, and 7.
WP 0138 00-7

 


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