Yanmar 6LY3 series - Section 6 Fuel System

6LY3 Service Manual
6-1
© 2007 Yanmar Marine International
6LY3 Service Manual
Section 6
FUEL SYSTEM
Page
Safety Precautions .......................................................................... 6-3
Introduction...................................................................................... 6-4
Specifications .................................................................................. 6-5
Fuel Injection Pump / Governor / Timer .......................................... 6-7
Fuel Injection Pump Components ............................................. 6-8
Governor Components and Functions..................................... 6-10
Timer Components and Functions .......................................... 6-11
Removing the Fuel Injection Pump.......................................... 6-14
Installing the Fuel Injection Pump............................................ 6-17
Troubleshooting the Fuel Injection System ............................. 6-24
Fuel Injection Nozzle Components and Functions ........................ 6-26
Fuel Injection Nozzle Functions .............................................. 6-26
Fuel Feed Pump Components and Functions............................... 6-28
Fuel Feed Pump Components................................................. 6-29
Fuel Feed Pump Specifications............................................... 6-30
Disassembling the Fuel Feed Pump ....................................... 6-30
Inspecting the Fuel Feed Pump .............................................. 6-30
Assembling the Fuel Feed Pump ........................................... 6-30
Testing the Fuel Feed Pump ................................................... 6-31
Fuel Filter Components and Functions ......................................... 6-33
Inspecting the Fuel Filter ......................................................... 6-34
Electronic Control System ............................................................. 6-35
Engine Control System Diagram ............................................. 6-36
Sensors and Actuators ............................................................ 6-37
Injection Quantity Control Diagram.......................................... 6-38
Injection Timing Control Diagram ............................................ 6-39
Timer Phase Detection ............................................................ 6-40
ECU Control Data Management.............................................. 6-41
ECU Data Flow........................................................................ 6-43