Yamaha F400A 2022 - Installing the Fuel Injector and Fuel Rail

Direct injection pump and fuel injector
6-20
2. Check:
• Electrical performance of the fuel injec-
tors. See “Checking the fuel injector”
(5-29).
Installing the fuel injector and fuel rail
Be careful not to scratch the installation
area of the O-ring or the nozzle.
1. Clean the fuel injector and special service
tool to remove any foreign material.
2. Install:
• Spring
•Backup ring
•O-ring
• Stopper
a. Install a new backup ring “1” and O-
ring “2”.
TIP:
Make sure to face the tapered end of the
backup ring “1” toward the O-ring.
b. Put a new stopper “3” into the hole in
the special service tool “4”.
TIP:
Install the stopper so that the side of the stop-
per with the notch is facing toward the special
service tool.
c. Fit the injector end into the stopper,
and then push the injector down to in-
stall it.
3. Install:
• Nozzle seal
a. Set the fuel injector onto the special
service tool “1”.
b. Install the special service tools “2” and
“3” and a new nozzle seal “4”.
TIP:
• Make sure to face the stepped section of
special service tool “2” toward the injector
body.
• Make sure that the special service tool “3”
does not contact the end of the nozzle.
• Make sure that the nozzle seal “4” is not de-
formed.
c. Install the nozzle seal “1” onto the spe-
cial service tool “2” up to the bottom of
the tool using the special service tool
“3”.
New
New
New
New
4
3
1 2
Stopper “4”
90890-06699
Stopper “1”
90890-06699
Seal fitter “2”
90890-06708
Nozzle cap “3”
90890-06697
1
2
3
4
New
3
4
2
1