Honda BF40D Manuel D'utilisation page 260

6) Remove the impeller cover and the impeller gasket B.
Replace the gasket with a new one on reassembly.
Remove the 5 x 200 mm tube assembly from the gear case
1
assembly.
2
3
4
5
6
7
8
9
10
11
12
7) Remove the water pump housing and the water pump
13
gasket.
Replace the gasket with a new one on reassembly.
14
8) Remove the 41.7 x 3.5 mm O-ring from the water pump
15
housing.
Replace the O-ring with a new one on reassembly.
16
17
18
19
20
11-20
[1]
5 x 200 mm TUBE
[2]
ASSEMBLY
IMPELLER
GASKET B
[1]
WATER PUMP
HOUSING
[2]
41.7 x 3.5 mm
O-RING
[3]
WATER PUMP
GASKET
260
[3]
IMPELLER COVER