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Use proper lubricants on seal ring
DO:
surfaces to install injector in engine.
Minimize time between applying lubricant
and inserting injector / rail.
DO: Pulse (actuate) stuck closed or tip-leak
suspected injector (Actuate consists of one
pulse <5 sec duration at 9 to 15V).
DO: Pulse (actuate) injectors prior to a dry
fuel system leak test at engine/vehicle
assembly to reseat injector valves.
DO: Avoid any liquid contamination in the
injector area.
Use care during connection of
DO:
harness to injector.
DO: Use recommended terminal lubricant
on mating connector.
Return any dropped, damaged, or
DO:
suspect material with a tag that describes
the problem.
3. Installation guidelines
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.
•
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. 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.
ENGINE MANAGEMENT SYSTEM
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Avoid damage to seal ring during installation.
Avoid contamination at seal.
To verify the injector failure
Injector valves may not reseat without fuel
after shipping and handling resulting in false
leakage.
Coil could short circuit.
Avoid terminal damage.
Minimize
potential
corrosion.
Ensure fast and correct diagnosis of root
cause.
for
terminal
fretting
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Table of Contents
Troubleshooting
