Suzuki DF 25 Service Manual page 244

10-20 LOWER UNIT
LOWER UNIT INSTALLATION
Insert dowel pins 1.
Coat the driveshaft splines with Water Resistant Grease.
Apply a light coat of Suzuki Silicone Seal to mating surfaces of
gearcase and driveshaft housing.
Slide the lower unit 2 into place, making sure that the top of
the driveshaft engages properly with the crankshaft and that
water tube locates in the water pump case outlet.
Apply Suzuki Silicone Seal to the retaining bolts 3 and tighten
them to specified torque.
99000-25160 : Water Resistant Grease
99000-31120 : Suzuki Silicone Seal
Gearcase bolt : 23 N . m (2.3 kg-m, 16.5 lb.-ft.)
NOTE:
Apply Suzuki Silicone Seal to the six (6) gearcase bolts.
GEAR OIL
Fill the gearcase with specified gear oil.
(See the "PERIODIC MAINTENANCE / GEAR OIL" section on
page 2-6.)
99000-22540 : Suzuki Outboard Motor Gear Oil