Yanmar 4TNE98, Service Manual

Page: 150 / 246

4TNV98 & 4TNE98 Diesel Engine Section 4. Fuel System 148
Fuel Injection Pump
Removal of Fuel Injection Pump
1. Loosen the cooling fan V-belt.
2. Remove the engine coolant fan guard (if
equipped), engine coolant fan (Figure7-6, (2)) ,
spacer (Figure7-6, (3)) if equipped, V-pulley
(Figure7-6, (4)) and cooling fan V-belt (Figure7-
6, (1)) .
Figure 7-6
3. Close any fuel valves in the fuel supply line.
4. Place a drain pan under the fuel injection pump
to catch any spillage.
5. Remove the high-pressure fuel injection lines as
an assembly (Figure 7-7, (1)) .
NOTICE
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 of
the delivery valves.
6. First loosen the fuel line nuts at the fuel injectors
and then at the fuel injection pump.
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.
7. 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.
8. Disconnect the coolant lines from the cold start
device (Figure 7-7, (3)) on the fuel injection
pump. Plug the open ends of the lines to
minimize leakage and prevent contamination.
9. Disconnect the fuel return lines from the fuel
return fitting (Figure 7-7, (2)) . Plug the open
ends of the lines to minimize leakage and
prevent contamination.
Figure 7-7
10. Remove the fuel supply line (Figure 7-7, (4)) .
Plug the open end of the line to minimize
leakage and prevent contamination.
11. Remove the throttle cable from the fuel injection
pump.