Reverse Idler Gear: Inspection

Move the reverse shifter rod toward the reverse side. Check the clearance between the reverse idler gear and the timing case wall surface. If out of specification, select an appropriate reverse shifter lever and adjust.
Clearance A:

6.0 - 7.5 mm (0.236 - 0.295 in)

Fig 1: Identifying Clearance Between Reverse Idler Gear And Timing Case Wall Surface
Courtesy of SUBARU OF AMERICA, INC.
After installing a suitable reverse shifter lever, shift into neutral. Check the clearance between the reverse idler gear and the timing case wall surface. If out of specification, select the appropriate washer and adjust.
Clearance:

0 - 0.5 mm (0 - 0.020 in)

Fig 2: Checking Clearance Between Reverse Idler Gear And Timing Case Wall Surface
Courtesy of SUBARU OF AMERICA, INC.
Check the reverse idler gear and shaft for damage. Replace if damaged.