Honda BF40D Manuel D'utilisation page 312

5) While applying the specified air pressure to the gear case,
turn the vertical shaft five or six turns clockwise.
1
NOTICE
Be sure to turn the vertical shaft clockwise, or damage to
2
the pump impeller can occur.
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4
5
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6) While applying the specified air pressure to the gear case,
turn the propeller shaft right and left two or three turns.
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7) Leave the gear case for five minutes and then check that the
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air pressure is maintained.
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10
11
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8) If the air pressure drops, soak the gear case in a container
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filled with water. Apply the specified air pressure to the
gear case again, move the shift rod B, vertical shaft and the
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propeller shaft, and locate the point where the air is
leaking.
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9) Remove the water seal or O-ring from the rod or shaft
16 where the air is leaking.
10) After replacing the water seal or O-ring, perform pressure
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check again and be sure that the air is not leaking.
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11) Remove the gear case pressure tester and the adapter from
the gear case.
19 Install a new 6.9 x 1.45 mm O-ring on the oil check bolt, and
tighten the oil check bolt to the specified torque.
20
TORQUE: 6.5 N . m (0.7 kgf . m, 4.8 lbf . ft)
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[1]
VERTICAL
SHAFT
[1]
PROPELLER
SHAFT