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 TM 55-1905-217-34
(6) The idler gear bearing should be clean and lubricated with clean light engine oil prior to the pre-load
test. Idler gear assemblies which include new bearings should be "worked in" by grasping the gear firmly by
hand and rotating the gear back and forth several times.
(7) To check the pre-load by the first method:
(a) Mount the idler gear assembly on the engine.
(b) Install the center bolt and washer through the gear hub and thread into the cylinder block (effective
with 3A-48440, 4A-96718, 6A- 101509 a 1/2 "-13 x 2 1/2 " bolt replaced the 1/2 "-13 x 2" bolt). Tighten the bolt
to 80-90 lb-ft torque.
(c) Place steel plate (lower plate shown in figure 3-65) against hub and bearing. Insert three 3/8"-16
bolts through plate and thread into hub. Tighten the bolts to 25-40 lb-ft torque.
(d) Tie one end of a piece of lintless 1/8" cord around a 1/8" round piece of wood (or soft metal stock).
Place the wood between the teeth of gear, then wrap the cord around the periphery of the gear several times.
Attach the other end of the cord to spring scale, J 8129 (fig. 3-66). Maintain a straight, steady pull on the
scale, 90 o to the axis of the hub, and note the pull, in pounds and ounces, required to start the gear rotating.
Make several checks to obtain an average reading. If the pull is within 1/2 lb. minimum to 6 lbs. 12 ounces
maximum and does not fluctuate more than 2 lbs. 11 ounces, the idler gear and bearing assembly are
satisfactory for use.
3-87
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