Measure the O.D. of the idler gear shaft [Figure 70-100-39].
Measure the I.D. of the idler gear bushing [Figure 70-100-39].
If the clearance exceeds the allowable limit, replace the bushing.
To replace the idler gear bushing, make a driver tool as shown in figure [Figure 70-100-40].
Use a press and special driver tool, to remove the old bushing and install the new bushing [Figure 70-100-41].