4TNV98 & 4TNE98 Diesel Engine
Section 4. Fuel System
174
Regulating Valve
Figure 7-8
The regulating valve regulates the fuel feeding
pressure of the feed pump so that the fuel pressure
in the pump chamber is maintained within the
specified pressure range.
When the injection pump revolutions increase to
increase the fuel feeding pressure of the feed pump,
the fuel compresses the regulating valve spring to
lift the piston. The fuel is then returned to the
suction side as shown by the arrow in the figure.
It is therefore possible to regulate the pump
chamber pressure by changing the set force of the
regulating valve spring.
Figure 7-9
Figure 7-9
shows typical relationships between
pump revolutions and pump chamber pressure. The
hydraulic timer directly uses the pump chamber
pressure for controlling the injection timing.
Summary of Contents for 4TNV98
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Page 89: ...4TNV98 4TNE98 Diesel Engine Section 3 Engine 87 4TNE98 Engine Figure 6 1...
Page 171: ...4TNV98 4TNE98 Diesel Engine Section 4 Fuel System 169 Fuel System Components Figure 7 1...
Page 225: ...4TNV98 4TNE98 Diesel Engine Section 7 Starter Motor 223 Starter Motor Troubleshooting...
Page 242: ...4TNV98 4TNE98 Diesel Engine Section 8 Troubleshooting 240 Troubleshooting Charts...
Page 243: ...4TNV98 4TNE98 Diesel Engine Section 8 Troubleshooting 241...
Page 244: ...4TNV98 4TNE98 Diesel Engine Section 8 Troubleshooting 242...
Page 246: ...4TNV98 4TNE98 Diesel Engine Section 8 Troubleshooting 244 4TNE98 Engine...