Suzuki DF 25 Service Manual page 240

10-16 LOWER UNIT
PINION NUT
Apply Thread Lock 1342 to the threads of the pinion nut before
threading it onto the driveshaft.
Tighten nut to the specified torque.
Pinion nut : 18 N . m (1.8 kg-m, 13.0 lb.-ft.)
99000-32050 : Thread Lock 1342
09921-29510 : Drive shaft holder
CHECKING DRIVESHAFT THRUST PLAY
Before installing reverse gear, driveshaft thrust play should be
checked.
(See the "GEARS-SHIMMING AND ADJUSTMENT / CHECK-
ING DRIVESHAFT THRUST PLAY" section on page 10-26)
09951-09511 : Gear adjusting gauge
PROPELLER SHAFT
Slide the clutch dog shifter 2 onto the propeller shaft 1.
NOTE:
For correct installation, the side of the clutch dog shifter which
must face towards forward gear is marked with the letter "F".
Insert the return spring 3, push pin 4 and push rod 5 into
propeller shaft.
Align the holes in the shifter dog and push pin. Depress the
push rod and slide the dog pin 6 through both dog and push
pin.
Install the dog pin retaining spring 7, ensuring that it fits snugly
into the groove on the dog shifter.