Determining Forward Gear Backlash - Mercury 40 Service Manual

7. The correct clearance between the gauging sur-
face and the pinion gear is .025 in. (0.64mm).
8. To obtain .025 in. (0.64mm), add or subtract
shims below the upper bearing race to lower or
raise the pinion gear.
9. After final adjustment to pinion height, and for-
ward gear backlash has been established, ap-
ply Loctite 271 to threads and torque new pinion
nut to 50 lb. ft. (67 N·m).
a
c
Loctite "271" (92-809819)
7
a - Bearing Race
b - Shim(s)
c - Pinion Nut (Recessed Side Toward Pinion)
6B-26 - LOWER UNIT
c
51285
b
7
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Determining Forward Gear Backlash

NOTE: Read entire procedure before attempting any
change in shim thickness.
1. Obtain correct pinion gear location; refer to "De-
termining Pinion Gear Location", preceding.
2. Install Bearing Preload Tool on driveshaft; refer to
"Determining Pinion Gear Location", preceding.
3. Install components.
4. Torque to 45 lb. in. (5 N·m)
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
forward gear tapered roller bearing.
6. Re-torque puller bolt to 45 lb. in. (5.1 N·m).
b
a
c
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90-852572R1 JANUARY 1998