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ARMY TM 9-2815-254-24
AIR FORCE TO 38G1-94-2
3-30.3. Inspect and Measure.
3-30.3.1. Idler Gear and Shaft.
a. Using a micrometer, measure idler gear shaft OD, refer to FIGURE 3-103. standard 00 is 1.769 to 1.770
in. (44.95 to 44.98 mm), with a limit of 1.767 in. (44.96) If OD is less than limit, replace shaft.
b.
Using inside micrometer, measure idler gear ID. Standard ID is 1.7717 to 1.7718 in. (45.0 to 45.03 mm), with
a limit of 1.7756 in. (45.10 mm).
c.
Standard clearance between idler gear shaft OD and idler gear ID is 0.0010 to 0.0033 in. (0.025 to 0.085 mm)
. If clearance exceeds limit of 0.608 in. (02 mm), replace idler gear.
3-30.3.2. camshaft.
a.
Inspect journals, cams, oil pump drive gear, and camshaft bearing for excessive wear and damage. If exces-
sive wear or damage is found, replace camshaft and bearings.
b.
Standard camshaft journal diameter is 1.88 to 1.89 in. (47.94 to 47.97 mm). Using a micrometer, measure
journal diameter two places, 180 degrees apart, refer to FIGURE 3-104. If measured diameter is less than
limit of 1.87 in. (47.6 mm), replace camshaft.
3-154
FIGURE 3-103. Idler Gear Shaft Outside Diameter
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