Cub Cadet Challenger Series Service Manual page 236

Engine Management System
Avoid applying lubricant over the director plate holes – this may restrict injector
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flow. Do not dip the injector tip in lubricant.
Multec 3.5 injectors come from the factory with the seal rings attached. The re-
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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
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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
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accidental attempt is made to start the engine.
• Disconnect the electrical connector from the injector wiring harness.
Relieve fuel pressure
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Remove the retaining clip from the fuel injector.
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Remove the fuel line connection from the injector
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• Carefully clean debris from the interface surfaces. Do not damage seal mating
surfaces.
Remove the injector from the manifold
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Apply a light coating of a lubricant to both the upper and lower injector seal ring
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of the replacement injector.
Install the new injector into the manifold. Check that the injector is installed in the
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original orientation to maintain proper spray targeting, and that the retaining clip
is properly seated on the injector and the fuel line
• Install the retaining clip after connecting the fuel line
Tighten the injector mounting to the desired torque as mentioned in
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this manual
Tighten the fuel line
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Re-install the injector electrical connector
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• Check for fuel leaks with the key "on" and the engine "off"
Start engine and verify proper operation.
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