Shift Shaft Installation - Mercury 25 EFI Service Manual

12. Remove the water pump cover and screws.
g
h
Forward Gear
Backlash
Driveshaft Holding Tool
Pinion Nut Tool
Dial Indicator
Dial Indicator Adapter
Backlash Indicator Arm
NOTE: The values in the following table represent possible dial indicator readings and the resultant shim changes required
to achieve the recommended backlash. (+) requires a shim value to be added; (‑) requires a shim value to be subtracted.
0.00–0.05 mm (0.00–0.002 in.)
0.06–0.20 mm (0.002–0.008 in.)
0.21–0.32 mm (0.008–0.012 in.)
0.33–0.54 mm (0.013–0.021 in.)
0.55–0.65 mm (0.022–0.026 in.)
0.66–0.80 mm (0.026–0.031 in.)
0.81–0.95 mm (0.032–0.037 in.)
0.96–1.11 mm (0.038–0.044 in.)
1.12–1.30 mm (0.044–0.051 in.)
1.31–1.45 mm (0.052–0.057 in.)
1.46–1.60 mm (0.057–0.063 in.)
1.61–1.75 mm (0.063–0.069 in.)
1.76–1.90 mm (0.069–0.075 in.)
1.91–2.05 mm mm (0.075–0.081 in.)
2.06–2.25 mm (0.081–0.089 in.)

Shift Shaft Installation

1. Install the shift shaft with the bushing into the gearcase.
90-8M0105568 eng MARCH 2016
f
i
a
Gauge Reading
a - Water pump base
e b - Water pump cover
c - Screws
d - V notch
d
e - Backlash Indicator Arm
f - Adapter
c
g - Dial Indicator
h - Threaded rod (obtain locally)
i - Nuts and washers (obtain locally)
b
17063
0.33–0.54 mm (0.013–0.021 in.)
91‑853996 14
91‑853996 12
91‑58222A1
91‑83155
91‑803133 12
© 2016 Mercury Marine
Gear Housing
Shim Adjustment
–0.15 mm (–0.006 in.)
–0.10 mm (–0.004 in.)
–0.05 mm (–0.002 in.)
0.00 mm (0.000 in.)
+0.05 mm (+0.002 in.)
+0.10 mm (+0.004 in.)
+0.15 mm (+0.006 in.)
+0.20 mm (+0.008 in.)
+0.25 mm (+0.010 in.)
+0.30 mm (+0.012 in.)
+0.35 mm (+0.014 in.)
+0.40 mm (+0.016 in.)
+0.45 mm (+0.018 in.)
+0.50 mm (+0.020 in.)
+0.55 mm (+0.022 in.)
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