Honda BF40D Manuel D'utilisation page 264

13) Remove the 3 x 14.8 mm roller from the push rod, and
remove the push rod from the shift rod B using a
commercially available pin driver.
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14) Remove the seal holder from the shift rod B.
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15) Check the 7 mm water seal lip for cuts and replace it if
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necessary.
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16) Remove the 7 mm water seal from the seal holder.
Replace the water seal with a new one on reassembly.
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17) Remove the 47 x 3.1 mm O-ring from the seal holder.
16 Replace the O-ring with a new one on reassembly.
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11-22
[1]
SEAL HOLDER
[4]
PUSH ROD
[1]
SEAL HOLDER
[3]
47 x 3.1 mm O-RING
264
[2]
SHIFT ROD B
[3]
3 x 14.8 mm
ROLLER
[2]
7 mm WATER
SEAL