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D

Service Bulletin

Volvo Trucks North America

Greensboro, NC USA

Date

Group

No.

Page

11.2006

230

247

1(11)

Trucks

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.
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

USA22609.ihval

Summary of Contents for D16F

Page 1: ...ign 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 USA22609 ihva...

Page 2: ... fuel filter housing can be equipped with a pre filter 5 and a water separator 6 where fuel is filtered through the primary filter that separates any water from the fuel The supply pump 1 forces the fuel into the fuel filter housing through the main filter 7 to a cylinder head longitudinal fuel gallery 8 This channel supplies each unit injector 9 with pressurized fuel by a circular groove around e...

Page 3: ...lied Manual Hand Pump The manual hand pump 13 is located on the fuel filter housing and is used to pump fuel when the engine is not running after the fuel system has been drained for repair etc The non return valve 22 for the hand priming pump is also located in the fuel filter housing Other The fuel filter housing eliminates the need to drain the fuel when replacing the filter The valve pegs 17 a...

Page 4: ...re equipped with an electronically controlled injection system An Engine Electronic Control Unit EECU receives electrical signals from the accelerator pedal and a number of other sensors on the engine These sensors provide speed pressure and temperature signals sent to the EECU which in turn governs the fuel injection procedure The EECU has a built in diagnostic system which electronically detects...

Page 5: ...6 230 247 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 W2005847 Typical Compression Sealing Washers ...

Page 6: ...le 2 Pump Chamber 10 Nozzle 3 High Pressure Fuel Line 11 Needle Control Valve NCV 4 Return Spring 12 Needle Control Valve Armature 5 Needle Backing Chamber 13 Needle control Valve Electrical Coil 6 Needle Control Piston 14 Spill Valve Electrical Coil 7 Needle Closing Spring 15 Spill Valve Armature 8 Needle Chamber 16 Spill Valve SV ...

Page 7: ... power stages capable of driving the solenoids The injected fuel quantity per pump cycle is determined by how long the SV is closed during the pump stroke The start of injection i e injection timing is determined by when the SV is closed The injection pressure achieved is balanced out by a number of factors 1 The pumping capacity pump element diameter cam rate verses the restriction in the nozzle ...

Page 8: ... the same pressure acting on both areas the acting force is spring force plus the pressure force do to the difference of the two effective areas This keeps the needle closed When the desired pressure in the needle chamber is achieved the NCV is activated closing the high pressure line to the back of the needle control piston and at the same time connecting the back of the piston to the low pressur...

Page 9: ... now flow through the fuel valve through the holes in the unit injector and out through the fuel gallery The spill phase continues as long as the fuel valve is open Injection Phase The injection phase begins when the fuel valve closes The camshaft lobe and rocker arm continue to press down the pump plunger and injection occurs as the route through the fuel valve closes The injection phase continue...

Page 10: ... water and very good filtering properties In addition a fine gauge net filter on the fuel suction line in the fuel tank separates any possible solid impurities before the fuel is pumped up into the system Fuel Feed Pump The capacity of the pump has been adapted to give the correct pressure and flow to the unit injectors Filling the unit injectors requires relatively high pressure The flow must be ...

Page 11: ...sensors on the engine It calculates the amount and the time to inject fuel into the cylinders Electrical wiring to the unit injector fuel valves transmits control signals to the injectors The EECU uses the flywheel sensor to monitor engine rotation and engine speed variations during a revolution This allows the EECU to ensure that each unit injector receives exactly the correct amount of fuel The ...

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