Yanmar 4TNV98, Service Manual

Page: 146 / 246

4TNV98 & 4TNE98 Diesel Engine Section 4. Fuel System 144
Test and Adjustment Specifications
Model
Engine
Class
Injector
ID mark*
Fuel Injector Pressure Fuel Injection Timing
4TNV98 VM V
3133-3278 psi
(21.6-22.6 MPa;
220-230 kgf/cm²
See Checking and Adjusting
Fuel Injection Timing on page
157
NOTE: Fuel injection pressure of a new fuel injector is reduced approximately 72.5 psi (0.5 MPa; 5.0 kgf/cm²)
after about 5 hours of operation due to the initial break in of the engine. When adjusting a new fuel injector or
after it has been disassembled for service, adjust the fuel injector 72.5 psi (0.5 MPa; 5.0 kgf/cm²) higher than
the above standard.
NOTE: All fuel injectors have a three character identification mark (Figure7-2, (1)) . The first character starts
with “V” or “W”.
Figure7-2
** Fuel injector identification is critical as each engine has a unique fuel injection pressure. The fuel nozzle is
specifically matched to the fuel injector by engine model and / or engine speed.