TOHATSU BFT115A Service Manual page 527

GEAR CASE (STANDARD ROTATION)
Apply marine grease to the needle bearing rollers (1)
and install them into the needle bearing outer ring (2).
Install the forward bevel gear/taper bearing (3).
(2)
(3)
(1)
Install the vertical shaft (1) into the gear case (2).
Apply gear oil to the threads and seating surface of the
(4)
(1)
(2)
lock nut (3).
Tighten the lock nut to the specified torque using the
special tool and a torque wrench (4).
(5)
TOOL:
Lock nut wrench, 36 × 47.8 mm (5) 07916-MB00002
TORQUE: 123 N·m (12.5 kgf·m, 91 lbf·ft)
To tighten the lock nut, read the torque as follows.
Formula:
(3)
Torque wrench reading =
[A x B] / [A + C]
A: Torque wrench effective length [m (ft)] (6) (4)
(5)
B: Specified torque [N·m (kgf·m, lbf·ft)]
C: Lock nut wrench effective length [m (ft)] (7)
Example:
Torque wrench reading using a torque wrench with an
effective length of 0.4 m (1.31 ft) and lock nut wrench
with an effective length of 0.05 (0.164)
(6)
(7)
Torque wrench reading =
[0.4 (1.31) x 123 (12.5, 91)]
/ [0.4 (1.31)] + [0.05 (0.164)]
= 109 [N·m (11.1 kgf·m, 80 lbf·ft)]
A: Torque wrench effective length = 0.4 m (1.31 ft)
B: Specified torque = 123 N·m (12.5 kgf·m, 91 lbf·ft)
C: Lock nut wrench effective length = 0.05 (0.164)
I.e. torque wrench reading is 109 N·m (11.1 kgf·m, 80
lbf·ft).
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