Yanmar 4BY, Service Manual

Page: 145 / 275

FUEL SYSTEM
6-16
BY Service Manual
Repair
13. Install fuel injector and high-pressure line. See
Installation of Fuel Injector on page 6-16 .
14. Run engine and check for fuel leaks.
Installation of Fuel Injector
1. Make sure that the old gasket is not at the
bottom of the injector seat. Clean the sealing
surfaces of the injector seat.
See Cleaning Fuel
Injector Cavities on page 6-14 .
IMPORTANT
Always install new copper gasket when
installing an injector. Make sure all sealing
surfaces are clean.
Figure 6-15
2. Inspect the O-ring and replace as necessary.
Lubricate the O-ring with petroleum jelly.
3. Install new gasket (Figure 6-15, (1)) on tip of
injector (Figure 6-15, (2)) .
4. Place the retainer (Figure 6-15, (3)) on the
injector as shown.
Note: If installing used fuel injectors, clean the
stem and nozzle prior to installation.
Figure 6-16
5. Install the injector and retainer as an assembly.
6. Install two nuts (Figure 6-16, (1)) and tighten to
8 N·m (71 in.-lb)
7. Install the high-pressure fuel line
(Figure 6-16, (2)) . See Removing and Installing
High-Pressure Fuel Lines on page 6-17.
8. If removed, install clamp (Figure 6-16, (3)) .
A
WARNING
HIGH PRESSURE HAZARD!
• Avoid skin contact with high pressure
diesel fuel spray caused by a fuel
system leak such as a broken fuel
injection line. High pressure fuel can
penetrate your skin and result in
serious injury. If you are exposed to
high pressure fuel spray, obtain
prompt medical treatment.
• NEVER check for a fuel leak with your
hands. ALWAYS use a piece of wood
or cardboard. Have your authorized
Yanmar marine dealer or distributor
repair the damage.
• Failure to comply could result in death
or serious injury.
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