Yanmar 3TNV82A-B, Service Manual

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FUEL SYSTEM
TNV DI Service Manual 7-35
Fuel Injectors
9. Tighten the fuel injection pump mounting nuts
and rear bracket(s).
10. Remove the dial indicator and adapter. Replace
the plug in the pump plunger opening and
tighten it to specification. If removed, install the
intake manifold and pump insulator. Tighten the
high-pressure injection line nuts to
specification. Open the fuel supply valve,
remove the clamp from the fuel return line and
prime the fuel system. Operate the engine and
check it for leaks.
FUEL INJECTORS
Removal of Fuel Injectors
2-Valve Cylinder Head
1. Close any fuel valves in the fuel supply line.
2. Remove the high-pressure fuel injection lines
as an assembly (Figure 7-48, (1)).
Figure 7-48
Note: To prevent “rounding” the fuel line nuts
always use a “line” or “flare nut” wrench.
When loosening the fuel line nuts,
always hold the fuel injection pump
delivery valves with a “back up” wrench
to prevent loosening.
• Loosen the fuel line nuts at the fuel injectors
and then at the fuel injection pump.
• Finish loosening all the fuel line nuts and
remove the high-pressure fuel lines as an
assembly being careful not to bend any of the
fuel lines. Be sure to protect the fuel system
from contamination by covering all open
connections.
3. Remove the return fuel hoses (Figure 7-49, (1))
from one side of each fuel injector.
4. Remove the bolts and washers that secure the
fuel injector retainers (Figure 7-49, (2)) to the
cylinder head.
5. Remove the fuel injector retainer.
(1)
0000154A
CAUTION
Remove or install the high-pressure fuel
injection lines as an assembly whenever
possible. Disassembling the
high-pressure fuel injection lines from
the retainers or bending any of the fuel
lines will make it difficult to reinstall the
fuel lines.
0000047en
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