Mercury 25 EFI Service Manual page 530

Jet Drive Outboard
Description
Lower bolts (4)
Upper bolt
Tube Ref No.
Loctite 271 Threadlocker
7
5. Lubricate the driveshaft and impeller bore with 2‑4‑C with PTFE.
Tube Ref No.
2-4-C with PTFE
95
6. Place the plastic sleeve inside the impeller and install the impeller, as shown.
7. Tighten the impeller nut on the shaft to remove any play between the impeller and shaft. If the tabs on the nut retainer do
not line up with the flats on the nut, remove the impeller nut and turn the nut retainer over. Tighten the impeller nut again.
8. Temporarily install the water intake housing to check the 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.
Clearance between impeller and liner
Page 9A-18
Description
Description
a - Plastic sleeve
b - Impeller
c - Shear key
d - Shims
e - Nut retainer
a f - Impeller nut
b
c
d
e
f
25730
a -
b -
a
25824
b
© 2016 Mercury Marine
Where Used
Jet drive mounting bolt threads
Where Used
Driveshaft and impeller bore
Shim washers
Impeller clearance
Jet Drive
Nm lb. in.
34.0
31.0
Part No.
92-809819
Part No.
92-802859A 1
0.76 mm (0.03 in.)
90-8M0105568 eng MARCH 2016
lb. ft.
25
23