Shift Link Rod Adjustment - Mercury 25 EFI Service Manual

4. Temporarily install the water intake housing in order to check for impeller clearance. The clearance between the impeller
and liner should be 0.76 mm (0.03 in.). Shim washers can be transferred to either side of the impeller to raise or lower the
impeller to the correct clearance setting. The water intake housing can be shifted sideways a small amount in order to
center the liner.
5. After setting the impeller height, tighten the impeller nut snug with a wrench. Secure impeller nut by bending tabs against
the flats on the impeller nut.
b
NOTE: If the outboard is used in saltwater, apply Extreme Grease around the entire mounting flange on the water intake
housing and also to the threads on the six mounting bolts.
Tube Ref No.
Extreme Grease
6. Install the water intake housing with six bolts. Check clearance around the impeller to ensure the water intake housing is
centered and not rubbing against the liner. Tighten the mounting bolts to the specified torque.
Description
Water intake housing mounting bolts

Shift Link Rod Adjustment

Pressurized water hitting the reverse gate may cause it to engage, causing sudden and unexpected slowing of the boat. This
can cause serious injury or death from occupants being thrown within or out of the boat. Adjust the shift link rod to lock the
reverse gate, preventing it from interfering with water flow.
90-8M0105568 eng MARCH 2016
a -
b -
a
b
29080
a - Tabs
b - Impeller nut
a
29082
Description
Water intake housing mounting flange and mounting bolts
Shims
Clearance between impeller edge and liner
Where Used
29081
WARNING
!
© 2016 Mercury Marine
Maintenance
Part No.
8M0071842
Nm lb‑in. lb‑ft
13 120
Page 1B-17
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