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 TM 55-1905-223-24-5
Table 4-8. Connecting Rod Torque Specifications
Minimum
Maximum
ft-lb.
ft-lb.
Step 1.
Tighten to
70
75
Step 2.
Tighten to
140
150
Step 3.
Loosen completely
Step 4.
Tighten to
25
30
Step 5.
Tighten to
70
75
Step 6.
Tighten to
140
150
(c)
Measure the crankshaft bore in the connecting rod (1, FIGURE 4-31) with a dial bore gauge. The
connecting rods must have a crankshaft bore with a diameter between 3.3157 to 3.3167 inches
(84.219 to 84.244 mm).
(d)
Measure the inside diameter of the piston pin bushing (2). Use a dial bore gauge. The inside
diameter must measure between 2.0010 to 2.0022 inch (50.825 to 50.838 mm).
(e)
If the crankshaft bore is not correct, the connecting rod (1) must be machined to the correct size or
replaced.
(f)
Discard all connecting rods (1) that have cuts, scratches or other damage that is deeper than 1/32
inch (0.80 mm) on the "I-Beam."
(8)
Calibrate the rod checking fixture, ST-561, and locating mandrel, ST-563, and check the connecting
rod length.
(a)
Use a new connecting (master) rod that measures 12.000 inches (304.80 mm) between the
centers of the crankshaft bore and the piston pin bore to calibrate the fixture.
(b)
Select the correct piston pin mandrel from the locating mandrel and install it in the piston pin bore.
(c)
Install the arbor in the crankshaft bore and expand the arbor.
(d)
Make sure the pin on the arbor is down and locked in position in the center of the connecting rod.
(e)
Put the connecting rod (1) in the fixture. Move the dial holder so that the contact points of the
indicators are touching the mandrel in the piston pin bore.
(f)
Tighten the bracket to hold the indicators and set the indicator dials at zero.
(g)
Remove the connecting rod (1) from the fixture.
4-70
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