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 TM 55-1905-223-24-3
(h) Turn the rod (1) horizontally 180 degrees and put the rod (1) in the fixture.
(i) If the dial indicators show any change from the first reading, adjust the dials to half of the
indicated change.
(j) In either position that the connecting rod (1) is put in the fixture, the dials will show the same
reading, but in opposite directions on the dials. At this point the fixture is calibrated.
(9)
Check the alignment of the connecting rod (1).
(a) Install the mandrel and arbor in the connecting rod (1) to be checked. See steps (12) (b), (c)
and (d) in the calibration procedure above.
(b) Put the connecting rod (1) in the fixture.
(c) Measure the length. The rod (1) must be no longer than the master rod and no more than
0.002 inch (0.05 mm) shorter.
(d) Check the bore alignment by using the difference between the indicator readings. It must not
be more than 0.10 inch (0.25 mm) without a bushing installed or 0.004 inch (0.10 mm) with a
bushing installed.
(10)
Measure the amount of twist in the rod (1).
(a) Measure with a feeler gauge between the mandrel and the dial indicator holding plate.
(b) Without a piston pin bushing (2), the twist must be no more than 0.020 inch (0.51 mm).
(c) With a bushing (2) installed and machined to the correct size, the twist must be no more than
0.010 inch (0.25 mm).
(11)
Measure the connecting rod machine bolts (10).
(a) Check the smallest diameter. Discard if the diameter is less than 0.583 inch (14.81 mm).
(b) Replace any machine bolts (10) that have damaged threads.
(12)
Measure the pilot bore in the bolt holes.
(a) If the pilot bore in the rod (1) is larger than 0.6249 inch (15.872 mm), discard the rod.
(b) If the pilot bore in the cap (11) is larger than 0.6252 inch (15.880 mm), discard the cap (11).
(13)
Check the radius on the bolt pad.
(a) The pad must have a fillet radius of 0.045 to 0.055 inch (1.14 to 1.40 mm). See Figure 4-32.
4-76
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