Yanmar 4TNV98 Service Manual

TNV DI Service Manual
7-1
TNV DI Service Manual
Section 7
FUEL SYSTEM
Page
Before You Begin Servicing ............................................................ 7-3
Introduction...................................................................................... 7-8
Fuel Injection Pump................................................................... 7-8
Stop Solenoid............................................................................ 7-9
Cold Start Device....................................................................... 7-9
Trochoid Fuel Pump................................................................ 7-10
Electronically controlled governor............................................ 7-10
Fuel System Specifications ........................................................... 7-11
Special Torque Chart............................................................... 7-11
Test and Adjustment Specifications ........................................ 7-12
Special Service Tools.................................................................... 7-13
Measuring Instruments.................................................................. 7-13
Fuel System Diagram.................................................................... 7-14
Fuel System Components............................................................. 7-15
2-Valve Cylinder Head............................................................. 7-15
4-Valve Cylinder Head............................................................. 7-17
Fuel Injection Pump....................................................................... 7-19
Removal of Fuel Injection Pump.............................................. 7-19
Installation of Fuel Injection Pump........................................... 7-24
Checking and Adjusting Fuel Injection Timing .............................. 7-30
Determining the Fuel Injection Timing Specification................ 7-30
Checking Fuel Injection Timing ............................................... 7-31
Adjusting Fuel Injection Timing................................................ 7-34
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Yanmar 4TNV98 Specifications

General

Engine Model	4TNV98
Displacement	3.319 L
Bore x Stroke	98 mm x 110 mm
Number of Cylinders	4
Fuel System	Direct injection
Cooling System	Water-cooled
Starting System	Electric starter
Engine Type	Vertical, water-cooled, 4-cycle diesel
Aspiration	Naturally aspirated
Emission Regulation	EPA Tier 4
Rated Speed	2500 rpm
Lubrication System	Forced lubrication