TOHATSU BFT115A Service Manual page 579

GEAR CASE (COUNTER ROTATION)
Apply marine grease to the needle bearing rollers (1)
and install them into the needle bearing outer ring (2).
(2)
(1)
Install the vertical shaft (1) into the gear case (2).
• Be careful not to drop the needle bearing rollers.
(4)
(1)
(2)
Apply gear oil to the threads and seating surface of the
lock nut (3).
(5)
Tighten the lock nut to the specified torque using the
special tool and a torque wrench (4).
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.
(3)
Formula:
Torque wrench reading =
[A x B] / [A + C] (4)
(5)
A: Torque wrench effective length [m (ft)] (6)
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
(6)
(7)
with an effective length of 0.05 (0.164)
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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