Remove And Install High-Pressure Fuel Lines - Yanmar BY Series Service Manual

FUEL SYSTEM
Remove and Install High-Pressure
Fuel Lines
NOTICE: When working on the oil, coolant or fuel
systems you must protect the alternator from
contamination. Cover alternator with suitable
materials. Failure to comply may result in an
alternator failure.
Note: The procedures for high-pressure
injection lines or high-pressure line from
high-pressure fuel pump are essentially
the same. Differences are called out
within the steps.
1. Disconnect the battery negative (-) cable.
2. Shut off all valves in the fuel supply system.
3. Remove intake manifold and cover intake ports
to prevent foreign objects from entering engine.
See Intake Manifold on page 5-66.
4. If removing only one line, remove the clamp
joining the fuel injector lines to each other.
5. Loosen union nuts on high-pressure fuel line(s)
using special tool OEM No. 13 5 020 (or similar)
(Figure 6-19, (1)).
Figure 6-19
Figure 6-19
Note: Identify lines to ease installation.
6-14
( 1 )
0003678
© 2009 Yanmar Marine International
6. If removing high-pressure line between
high-pressure pump and fuel rail
(Figure 6-20, (1)), disconnect glow plug
connector (if equipped) (Figure 6-20, (2)).
4BY2 Engines: Rubber mount
(Figure 6-20, (3)) will be removed with the line.
Figure 6-20
Figure 6-20
7. Remove high-pressure fuel line(s). NOTICE:
Immediately cap or plug all openings to prevent
contamination of system.
8. Install line(s) and start all union nuts before
tightening any. Hand-tighten all union nuts.
NOTICE: Use care not to mix new
high-pressure fuel injection lines.
- Injection lines having an even numbered last
digit are used on even-numbered cylinders.
- Injection lines having an odd numbered last
digit are used on odd-numbered cylinders. Start
both union nuts on high-pressure line before
tightening either one.
Note: ALWAYS use special tool OEM No.
13 5 020 (or similar) when loosening or
tightening high-pressure fuel line union
nuts.
9. Tighten union nuts to 23 N·m (204 in.-lb).
10. Install intake manifold. See Intake Manifold on
page 5-66.
11. Open all fuel supply valves.
12. Connect the battery negative (-) cable.
13. Bleed fuel system. See Bleed the Fuel System
on page 6-22.
14. Start engine and check for fuel leaks.
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