Checking The Lower Unit For Air Leakage - Yamaha F30B 2018 Service Manual

2. Install:
• Impeller key "1"
• Impeller "2"
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a. Install the impeller key "1".
b. Align the slot "a" in the impeller "2" with the
impeller key "1", and then install the impel-
ler "2".
2
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3. Install:
• Insert cartridge "1"
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a. Aligning the protrusion "a" on the insert
cartridge with the groove "b" of the water
pump housing "2".
2
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4. Install:
• O-ring "1"
New
• Water pump housing assembly "2"
• Seal "3"
• Cover "4"
Do not turn the drive shaft counterclock-
wise, otherwise the water pump impeller
may be damaged.
a
1
a
1
b
TIP:
When installing the water pump housing, apply
grease to the inside of the insert cartridge, and
then turn the drive shaft clockwise while push-
ing down on the water pump housing.
2

Checking the lower unit for air leakage

1. Check:
• No air leakage
Air leakage  Repair the location of the
leak.
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a. Remove the oil level plug "1", and then in-
stall the leakage tester "2".
1
Leakage tester "2"
90890-06840
Leakage tester "2"
(commercially available)
8-21
Drive shaft and lower case
4
3
1
2