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Volvo Trucks North America
Greensboro, NC USA
Fuel System
This information covers the design and function of the fuel system on the Volvo D16F
engine.
Contents
•
"Fuel System" page 2
•
"Fuel System Components" page 4
Note: Information is subject to change without notice.
Illustrations are used for reference only and may differ slightly from the actual
vehicle being serviced. However, key components addressed in this information are
represented as accurately as possible.
PV776-20177053
D
Service Bulletin
Date
11.2006
Trucks
Group
No.
230
247
1(11)
Fuel System
Design and Function
D16F
W2005772
USA22609.ihval
Page
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Table of Contents
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Summary of Contents for Volvo D16F
-
Page 1: Design And Function
11.2006 1(11) Fuel System Design and Function D16F Fuel System W2005772 This information covers the design and function of the fuel system on the Volvo D16F engine. Contents • “Fuel System” page 2 • “Fuel System Components” page 4 Note: Information is subject to change without notice. - Page 2 Volvo Trucks North America Date Group Page Service Bulletin 11.2006 2(11) Design and Function Fuel System When fault tracing, it is important to understand the function of the system in order to avoid replacing non-defective components. System Function W2005904 Fuel is drawn up the fuel lines by the supply pump (1)
- Page 3 Volvo Trucks North America Date Group Page Service Bulletin 11.2006 3(11) Supply Pump Valves Two valves are located in the supply pump (1). The safety valve (11) allows fuel to flow back to the suction side if the pressure becomes too high, e.g., if the fuel filter is blocked or is too restricted.
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Page 4: Fuel System Components
11.2006 4(11) Fuel System Components W2004976 Current Volvo engines are electronically controlled diesel engines designed to meet today’s strict environmental standards. Meeting these standards requires optimum combustion. This demands, among other things, injecting the exact amount of fuel into the combustion chamber... - Page 5 Volvo Trucks North America Date Group Page Service Bulletin 11.2006 5(11) Fuel Line Compression Fitting Always replace the fuel line compression sealing washers when: • Troubleshooting for fuel aeration and/or • Performing any Service Procedure that requires the removal of engine fuel lines.
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Page 6: Unit Injectors
Volvo Trucks North America Date Group Page Service Bulletin 11.2006 6(11) Unit Injectors W2005194 1. Pump Element 9. Needle 2. Pump Chamber 10. Nozzle 3. High Pressure Fuel 11. Needle Control Valve Line (NCV) 4. Return Spring 12. Needle Control Valve Armature 5. - Page 7 Volvo Trucks North America Date Group Page Service Bulletin 11.2006 7(11) Unit injectors for diesel engines have both injector pump element and the nozzle assembly in the same body. The pump stroke is activated by a camshaft lobe which rotates at one half crankshaft speed in 4 stroke engines.
- Page 8 Volvo Trucks North America Date Group Page Service Bulletin 11.2006 8(11) To make the nozzle opening freely adjustable, a second valve is used, the Needle Control Valve (NVC). The NVC is a three port, two position valve, located between the high pressure fuel line, the low pressure fuel line and a needle backing chamber.
- Page 9 Volvo Trucks North America Date Group Page Service Bulletin 11.2006 9(11) Injector Operational Phases Fill Phase During the filling phase, the pump plunger is on its way up, the camshaft lobe is passing its highest point and the rocker arm is on its way toward the camshaft base circle.
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Page 10: Fuel Filter
Volvo Trucks North America Date Group Page Service Bulletin 11.2006 10(11) Fuel Filter W2005849 The system is equipped with a large fuel filter located on the left-hand side of the engine. The filter insert consists of a special corrugated filter paper with a high resistance to water and very good filtering properties. - Page 11 Volvo Trucks North America Date Group Page Service Bulletin 11.2006 11(11) Engine Electronic Control Unit (EECU) W2003778 The engine electronic control unit is the central part of the injection system. It is located on the left-hand side of the engine. The EECU receives continuous information from the accelerator pedal and from several other sensors on the engine.
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