Installing Jet Drive To Drive Shaft Housing - Mercury 75 Service Manual

Installing Jet Drive to Drive Shaft
Housing
1. Apply a light coat of 2-4-C w/Teflon to the drive
shaft splines. DO NOT APPLY GREASE TO THE
TOP OF THE DRIVE SHAFT AS THE GREASE
WILL PREVENT THE DRIVE SHAFT FROM
FULLY ENGAGING THE CRANKSHAFT AND
DAMAGE TO THE POWERHEAD AND/OR
GEAR CASE WILL RESULT.
2. Carefully slide jet drive into drive shaft housing
while aligning drive shaft splines with crankshaft
and the water tube with the water pump cover
seal.
3. Secure jet drive to drive shaft housing with 4
bolts. Torque bolts to 25 lb. ft. (33.9 N·m)].
a
a - Bolts [Torque to 25 lb. ft. (33.9 N·m)]
4. Secure aft end of jet drive to drive shaft housing
with bolt and washer. Torque bolt to 22.5 lb. ft.
(30.5 N·m).
a
a - Bolt and Washer [Torque to 22.5 lb. ft. (30.5 N·m)]
90-830234R3 DECEMBER 1997
5. Grease the drive shaft, shear key, and impeller
bore. Place the plastic sleeve (a) inside the im-
peller (b) and install impeller, shear key (c), shims
(d) nut retainer (e), and impeller nut (f). Turn the
nut tight on the shaft to remove any play between
the impeller and shaft. If the tabs on the retainer
do not line up with the flats on the nut, remove the
nut and turn the retainer over and re-tighten the
nut again.
a
a - Plastic Sleeve
b - Impeller
c - Shear Key
d - Shims
54165
e - Nut Retainer
f - Impeller Nut
6. Temporarily reinstall the water intake housing in
order to check for impeller clearance. The clear-
ance between the impeller and liner should be
0.030 in. (0.8 mm). Shim washers can be trans-
ferred to either side of the impeller to raise or low-
er the impeller to the correct clearance setting.
The water intake housing can be shifted side
ways a small amount in order to center the liner.
a
b
c
d
e
f
.03 in. (.8mm)
LOWER UNIT - 6B-21