955340 Volvo.Penta Hexagon screw

Illustration 1 g00647085
(1) Crankshaft position sensor
(2) Camshaft position sensor
(3) Injectors
(4) Retarder solenoid
(5) Rail for fuel supply
(6) Boost pressure sensor
(7) 2 Micron secondary fuel filter
(8) Atmospheric pressure sensor
(9) Fuel pump
(10) Primary fuel filter
(11) Fuel tank
(12) Fuel pressure regulator
(13) Engine oil pressure sensor
(14) Engine coolant temperature sensor
(15) Inlet air temperature sensor
(16) Fuel temperature sensor
(17) Ambient air temperature
(18) Engine coolant level sensor
(19) Accelerator pedal
(20) Accelerator pedal position sensor
(21) Batteries
(22) Engine Control Module (ECM)
(23) SAE J1587/J1708 Data link
(24) SAE J1922/J1708 Data link
(25) SAE J1939 Data link
(26) Warning and check engine lamps
(27) 2 Lamp outputs
(28) Timing calibration connector
(29) 6 Programmable outputs
(30) Cooling fan relay or solenoid
(31) Engine retarder switch
(32) PTO on/off & set/resume switches
(33) Cruise on/off & set/resume switches
(34) 7 Programmable inputs
(35) Vehicle speed sensor
(36) Speedometer & tachometer
(37) Service brake pedal position switches.
(38) Neutral & clutch pedal position switches
(39) keyswitch The Electronic Unit Injector system consists of the following systems: the mechanical system and the electronic system. The mechanical system is made up of the low pressure fuel supply system and the electronic unit injectors. The electronic system provides complete electronic control of all engine functions. The electronic control system consists of the following three types of components: input, control and output. Most changes to engine horsepower or to the performance are accomplished by installing new electronic software or upgrading mechanical components.There are five major components of the Electronic Unit Injector fuel system:
Electronic Unit Injectors
Fuel transfer pump
Engine Control Module (ECM)
Sensors
ActuatorsThe Electronic Unit Injectors produce fuel injection pressures up to 207000 kPa (30000 psi). The Electronic Unit Injectors also fire up to 19 times per second at rated speed. The fuel transfer pump supplies the injectors by drawing fuel from the tank and by pressurizing the tank between 60 and 125 PSI. The ECM is a powerful computer which controls all major engine functions. Sensors are electronic devices which monitor engine performance parameters. Engine performance parameters measure pressure, temperature and speed. This information is sent to the ECM via a signal voltage. Actuators are electronic devices which use electronic currents from the ECM to change engine performance. An example of an actuator is the Injector solenoid.Low Pressure Fuel System
Illustration 2 g00647032
(1) Crankshaft position sensor
(2) Camshaft position sensor
(3) Injectors
(4) Retarder solenoid
(5) Rail for fuel supply
(6) Boost pressure sensor
(7) 2 Micron secondary fuel filter
(8) Atmospheric pressure sensor
(9) Fuel pump
(10) Primary fuel filter
(11) Fuel tank
(12) Fuel pressure regulator
(13) Engine oil pressure sensor
(14) Engine coolant temperature sensor
(15) Inlet air temperature sensor
(16) Fuel temperature sensor
(17) Ambient air temperature
(18) Engine coolant level sensor
(19) Accelerator pedal
(20) Accelerator pedal position sensor
(21) Batteries
(22) Engine Control Module (ECM)
(23) SAE J1587/J1708 Data link
(24) SAE J1922/J1708 Data link
(25) SAE J1939 Data Link
(26) Warning and check engine lamps
(27) 2 Lamp outputs
(28) Timing calibration connector
(29) 6 Programmable outputs
(30) Cooling fan relay or solenoid
(31) Engine retarder switch
(32) PTO on/off & set/resume switches
(33) Cruise on/off & set/resume switches
(34) 7 Programmable inputs
(35) Vehicle speed sensor
(36) Speedometer and tachometer
(37) Service brake pedal position switches.
(38) Neutral & clutch pedal position switches
(39) keyswitch The low pressure fuel system supplies fuel from the fuel tank to the injectors. The low pressure fuel system has three basic functions:
The low pressure fuel system supplies fuel to the injectors for combustion.
The low pressure fuel system supplies fuel to the injectors for cooling.
The low pressure fuel system supplies fuel to the fuel system in order to remove air.The major parts in a low pressure fuel system consist of the following components:
Fuel tank
Fuel transfer lines
Primary fuel filter or water separator
Fuel transfer pump
Secondary fuel filter
Fuel priming pump
Fuel pressure regulator valveThe electronic unit injectors, the fuel transfer pump, the engine control module, sensors, and actuators are part of the low pressure fuel system.In the low pressure fuel system, the fuel is pulled from the fuel tank to the primary fuel filter or to the water separator. The primary fuel filter removes large debris from the fuel before the fuel flows into the transfer pump. The fuel transfer pump is a gear pump that contains a pressure relief valve. Fuel flows from the outlet port of the transfer pump to the secondary fuel filter. All 1999 and newer engines use a 2 micron fuel filter. The 2 micron filter removes small abrasive contaminants from the fuel system, which can cause damage to the unit injectors. The fuel filter base contains a hand operated fuel priming pump. The fuel priming pump removes air from the system when a fuel filter has been changed or a unit injector has been changed. The priming pump pulls fuel from the tank, around the transfer pump and into the filter. The transfer pump pushes fuel through the supply passage in the cylinder head and back to the tank.The fuel pressure regulator consists of a check valve that is spring loaded. The pressure relief valve opens at approximately 60 to 125 PSI. When the engine is in the off position and the fuel pressure drops below 60 PSI, the check valve closes. The check valve closes in order to prevent the fuel in the cylinder head from draining back into the fuel tank. Retaining the fuel in the head maintains a supply of fuel for the injectors during start-up requirement.The engine control module controls major engine functions. Sensors are electronic devices that monitor engine performance parameters. The pressure sensor, the temperature sensor and the speed sensor provide information to the electronic control module by a signal voltage. Actuators are electronic devices which use electrical currents from the engine control module to change engine performance. An example of an actuator is an injector solenoid.Electronic Controls
The electronic control system provides complete electronic control of all engine functions. The electronic control system consists of the following three types of components: input, control and output. Sensors monitor engine operating conditions. This information is sent to the Engine Control Module (ECM). The ECM has three main functions. The ECM provides power for the engine electronics and monitors input signals from the engine sensors. The ECM also acts as a governor to control engine rpm. The ECM stores active faults, logged faults, and logged events. The Personality