3-166.3 IDLER GEAR AND BEARING ASSEMBLY - MAINTENANCE INSTRUCTIONS (Continued).
PRE-LOAD CHECK OF BEARING (Cont)
To check the pre-load by the second method:
Attach the plates (two upper plates) to the idler gear with 1/2-13 inch center bolts, washers and
nut as shown. Tighten the bolt to 80-90 lb. ft.(108.5-122 Nm) torque.
Attach the other plate to the idler gear with three 3/8-16 inch bolts. Tighten the bolts to 25-40 lb.
ft. (37.9-54.2 Nm) torque.
Clamp the idler gear assembly and fixture in the vise as shown.
Attach the cord to the idler gear and spring scale and check the pre-load as outlined in item 4 of
the first method.
If the scale reading is within the specified 1 1/4 to 6 3/4 lbs. but fluctuates more than the permissible 2
lbs. 11 ounces, the idler gear and bearing assembly must NOT be installed on the engine. Fluctuations in scale
reading may be caused by the races not being concentric to each other, damaged races or rollers, or dirt or
foreign material within the bearings. In these cases, the bearing should be inspected for the cause of
fluctuation in the scale readings and corrected or a new bearing installed.