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.
FIGURE 3-103. Idler Gear Shaft Outside Diameter
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).
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.
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.
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.