LOWER UNIT - 6B-2790-817643R1 DECEMBER 1996
DETERMINING FORWARD GEAR BACKLASH
NOTE: Read entire procedure before attempting any
change in shim thickness.
1. Obtain correct pinion gear depth; refer to “Deter-
mining Pinion Gear Depth,” preceding.
2. Install Bearing Preload Tool (91-14311A1) on
drive shaft; refer to “Determining Pinion Gear
Depth,” preceding.
3. Install components as shown.
53936
d
a
b
c
a - Propeller Shaft*
b - Bearing Carrier* (Assembled)
c - Puller Jaws (91-46086A1)
d - Puller Bolt (91-85716); Torque to 45 lbs. in.
(5.0 N·m)
*Refer to “Bearing Carrier and Propeller Shaft Installation,” fol-
lowing.
4. Rotate drive shaft 5 to 10 revolutions. This should
properly seat forward gear tapered roller bearing.
5. Install components as shown.
51117
e
f
d
c
a
c
b
a - Threaded Rod (Obtain Locally)
b - Washers
c - Nuts
d - Dial Indicator Adaptor Kit (91-83155)
e - Dial Indicator (91-58222A1)
f - Backlash Indicator Tool
6. Position Dial Indicator on appropriate line (from
chart) marked on Backlash Indicator Tool.
MODEL
ALIGN POINTER OF
DIAL INDICATOR WITH MARK
60 Big Foot, 60
SeaPro/Marathon
Backlash
Indicator
Tool (91-78473)
4
75-thru-90
(3 Cylinder)
Backlash
Indicator
Tool (91-78473)
4
100/115/125
(4 Cylinder)
Backlash
Indicator
Tool (91-19660)
1
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