Mercury 25 EFI Service Manual page 525

4. Pull the impeller straight off the shaft. If the impeller is tight, use a hammer and a block of wood to rotate the impeller
clockwise on the shaft until the keyway is directly above the flat on the shaft. This will free the jammed key and allow
removal.
5. Remove the five bolts securing the jet drive to the driveshaft housing. Remove the jet drive.
a
a - Bolt (4)
b - Bolt (1)
90-8M0105568 eng MARCH 2016
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
© 2016 Mercury Marine
Jet Drive Outboard
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Page 9A-13