Yanmar 4BY, Service Manual

Page: 147 / 275

FUEL SYSTEM
6-18
BY Service Manual
Repair
Figure 6-17
Note: Identify lines to ease installation.
5. Loosen union nuts on high-pressure fuel line(s)
using special tool OEM No. 13 5 020 (or similar)
(Figure 6-17, (1)) .
Figure 6-18
6. If removing high-pressure line between
high-pressure pump and fuel rail
(Figure 6-18, (1)) , disconnect glow plug
connector (if equipped) (Figure 6-18, (2)) .
Rubber mount (Figure 6-18, (3)) will be
removed with the line.
7. Remove high-pressure fuel line(s).
IMPORTANT
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.
8. Install line(s) and start all union nuts before
tightening any. Hand-tighten all union nuts.
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 5-70.
11. Bleed fuel system. See Bleeding the Fuel
System on page 6-29.
CAUTION
Immediately cap or plug all openings to
prevent contamination of system.
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