Linhai ATV 500-D T3 EFI, Service Manual

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CHAPTER 3 ENGINE
LH500ATV-D T3 EFI SERVICE MANUA 19.0
CHAPTER 3 ENGINE PAGE. 3- 125
system leak test at engine/vehicle assembly to
reseat injector valves.
after shipping and handling resulting in
false leakage.
DO : Avoid any liquid contamination in the
injector area.
Coil could short circuit.
DO : Use care during connection of harness to
injector.
Avoid terminal damage.
DO : Use recommended terminal lubricant on
mating connector.
Minimize potential for terminal fretting
corrosion.
DO : Return any dropped, damaged, or suspect
material with a tag that describes the
problem.
Ensure fast and correct diagnosis of root
cause.
3.6.2.2.10 Installation guide lines
Follow these guidelines to prevent damage to the injector and its electrical
interface during the replacement or re-installation process.
Lubrication: Apply a light coating of lubricant to the lower injector seal ring. ISO
10 light mineral oil or equivalent is recommended.
The preferred technique is to apply the lubricant to the sockets the injectors are
being installed into, rather than directly to the seal ring itself. This will help
minimize the possibility of injector contamination.
Avoid applying lubricant over the director plate holes – this may restrict injector
flow. Do not dip the injector tip in lubricant.
All Multec 3 and Multec 3.5 injectors come from the factory with the seal rings
attached. The re-use of seal rings is not preferred when replacing an injector. If
an injector is to be re-used, and no new seal rings are available, take care to
inspect each seal ring for signs of damage. Even minor defects in the seal ring
can lead to leakage. Take extra care in installing seal ring over flange of
injector inlet.
Carefully installing the harness connector will prevent terminal damage. Listen
for a positive audible click from the connector retention device — this ensures
that it is fully engaged.
Avoid unnecessarily disconnecting/reconnecting the harness connector.
Wires routed in a manner that can allow them to become pinched between
components can result in a short circuit and a stuck open injector.
For injectors that require orientation for spray pattern, do not rotate the injector
in the fuel rail assembly to install the injector electrical connector. This may
dislodge the retaining clip, and result in improper spray orientation
3.6.2.2.11 Replacement Techniques
The following procedure outlines standard Multec 3 and Multec 3.5 Fuel Injectors
removal and replacement.
Warning: The injector and all associated hardware may be extremely hot.
Shut off ignition.
Disconnect negative battery cable to avoid possible fuel discharge if an
accidental attempt is made to start the engine.
Disconnect the electrical connector from the injector wiring harness.
Relieve fuel pressure
Remove the retaining clip from the fuel injector.
Remove the fuel line connection from the injector
Carefully clean debris from the interface surfaces. Do not damage seal mating
surfaces.
Remove the injector from the manifold
Apply a light coating of a lubricant to both the upper and lower injector seal ring
of the replacement injector.
Install the new injector into the manifold. Check that the injector is installed in
the original orientation to maintain proper spray targeting, and that the retaining
clip is properly seated on the injector and the fuel line