Service manual

FUEL INJECTION NOZZLE
INTRODUCTION
This section of the Service Manual describes the
operation and procedures necessary to
disassemble and reassemble the fuel injection
nozzles.
Yar~mar MP fuel injection pumps are designed for
use on TNV
(Dl) Direct lnjection engines, equipped
with hole type nozzles.
A list of Yanmar MP fuel
injection pump equipped engines is provided in the
following chart.
Yanmar Engines equipped with MP Fuel
Injection Pumps
3TNV82A
SPECIFICATIONS
All TNV fuel injectors have a three character
identification mark
(Figure 7-1, (1)). The first
character starts with
"V" or "W.
00041 05
Figure 7-1
*
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 engine speed.
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 spring.
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.
MP Series Service Manual YANMAR*