Yanmar BY Series Service Manual page 257

ELECTRICAL AND ECU
IMPORTANT
When working on the oil, coolant or fuel
circuits you must protect the alternator from
contamination. Cover alternator with
suitable materials. Failure to comply may
result in an alternator failure.
1. Disconnect battery negative (-) cable.
2. Shut off fuel supply valve at fuel tank.
( 1 )
( 1 ) ( 2 )
Figure 12-32
3. Disconnect electrical connector from sensor
(Figure 12-32, (1)).
CAUTION
Immediately cap or plug all openings to
prevent contamination of system.
4. Hold sensor hex (Figure 12-32, (2)) with
wrench and loosen retaining nut
(Figure 12-32, (3)).
5. Remove sensor from fuel rail.
6. Inspect threads of sensor. Replace sensor if
damage is evident.
7. Inspect the O-ring and replace if necessary.
8. Apply a light coating of petroleum jelly to O-ring.
12-30
( 3 ) ( 1 )
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IMPORTANT
The high-pressure fuel sensor can be
installed a maximum of ten times. After ten
installations, a new sensor must be
installed.
9. Install sensor in fuel rail. Ensure orientation is
correct.
10. Hold hex of sensor and tighten retaining nut to
70 N·m (52 ft-lb).
11. Connect battery negative (-) cable.
12. Bleed fuel system. See Bleeding the Fuel
System on page 6-29.
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.
13. Start engine and check for fuel leaks.
14. Check and delete any trouble codes that are
registered in the ECU after the work has been
completed.
BY Service Manual
Repair
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