6A-20 - LOWER UNIT 90-817643R1 DECEMBER 1996
7. The correct clearance between the gauging surface
(b) and the pinion gear (c) is .025 in. (0.64mm).
8. To obtain .025 in. (0.64mm), add or subtract shims be-
low the upper bearing race (b) to lower or raise the pin-
ion gear.
9. After final adjustment to pinion height, and forward
gear backlash has been established, apply Loctite
271 to threads and torque new pinion nut to 50 lb. ft. (67
N·m).
51263
51285
a
b
c
d
c
a - Bearing Race
b - Shim(s)
c - Pinion Nut [Recessed Side (d) Toward Pinion]
d - Recessed Side Toward Pinion
DETERMINING FORWARD GEAR BACKLASH
NOTE: Read entire procedure before attempting any
change in shim thickness.
1. Obtain correct pinion gear location; refer to “Determin-
ing Pinion Gear Location”, preceding.
2. Install Bearing Preload Tool on driveshaft; refer to “De-
termining Pinion Gear Location”, preceding.
3. Install components.
4. Torque to 45 lb. in. (5 N·m)
51119
a
b
c
d
a - Propeller Shaft*
b - Bearing Carrier* (Assembled)
c - Puller Jaws (91-46086A1)
d - Puller Bolt (91-58716) Torque to 45 lb. in. (5.1 N·m).
*Refer to “Bearing Carrier and Propeller Shaft Installation”, following.
5. Rotate driveshaft 10 revolutions to properly seat for-
ward gear tapered roller bearing.
6. Re-torque puller bolt to 45 lb. in. (5.1 N·m).
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