Reassembly Of Fuel Injectors; Installation Of The Fuel Injectors - Yanmar 3TNV82A Service Manual

Fuel Injectors
CAUTION
Each pressure adjusting shim removed
or added changes the pressure
threshold by approximately 275 psi
(1.9 MPa, 19 kgf/cm
shims increases the threshold pressure.
Removing adjusting shims reduces the
pressure threshold.
1. Disassemble the fuel injector assembly. See
Disassembly and Inspection of Fuel Injectors
on page 7-35.
2. Remove or add adjusting shims as needed.
3. Reassemble the fuel injector assembly. See
Reassembly of Fuel Injectors on page 7-37.
4. Retest the fuel injector. See Testing of Fuel
Injectors on page 7-33. If the injector cannot be
adjusted to the appropriate pressure, discard
the fuel injector.

Reassembly of Fuel Injectors

1. Secure the injector in a soft-jawed vise with the
nozzle end up.
2. Reinstall the shims, nozzle spring, nozzle
spring seat, valve stop spacer, nozzle valve,
and nozzle body.
3. Reinstall the nozzle case nut. Tighten it to
specification. See Special Torque Chart on
page 7-8.
TNV DI Service Manual
2
). Adding adjusting
0000081en

Installation of the Fuel Injectors

2-Valve Cylinder Head
1. Reinsert a new nozzle seat (Figure 7-55, (4))
and nozzle protector (Figure 7-55, (3)) in the
cylinder head for each injector.
2. Reinstall a O-ring on to each injector body.
3. Reinsert each fuel injector into the cylinder
head.
4. Reinstall the fuel injector retainers
(Figure 7-55, (2)) and torque the retaining bolts
to specification.
5. Reinstall the fuel return hoses
(Figure 7-55, (1)), one on each side of each
injector.
6. Reinstall the fuel high-pressure fuel line
assembly and tighten the nuts using a "line" or
"flare nut" wrench.
(1)
(2)
Figure 7-55
7. Prime the fuel system. See Priming the Fuel
System on page 4-12.
8. Operate the engine and check for fuel and
coolant leaks.
FUEL SYSTEM
(3)
(4)
0002092A
7-37