2000 RENAULT SCENIC Technical Note 3426A Workshop Manual

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Injector rail
13
13-30
NOTE: it is imperative that you replace the fuel return pipe (5) placed on the
injectors during removal.
16192-1R

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Injector rail
13
13-31
Reprime the circuit using a fuel cock (R) placed on the
diesel filter (depending on version).
NOTE: certain vehicles are not fitted with a fuel cock.
In this case, ignore the repriming procedure.
16870R3
After any intervention, check that there are no
leaks in the diesel circuit. Start the engine at idling
speed until the fan starts up, then accelerate several
times under no load.

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Injectors
13
13-32
Injectors
IT IS FORBIDDEN TO REMOVE THE INTERIOR OF
AN INJECTOR OR TO SEPARATE THE INJECTOR
HOLDER FROM THE PIPE.
IMPORTANT: before any intervention, connect the
after-sales diagnostic tool, query the injection
computer and check that the injection rail is not under
pressure. Take note of the fuel temperature.SPECIAL TOOLING REQUIRED
Elé. 1294 -01 Tool for removing windscreen
wiper arms
Mot. 1383 Tool for removing high pressure
pipes
TIGHTENING TORQUES (in daN.m)
Injector clamp mounting bolt 2 ± 0.2
High pressure pipe nut 2.5 ± 0.2

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Injectors
13
13-33
REMOVAL
If necessary, remove:
– the bulkhead panel using tool Elé. 1294-01,
– the scuttle panel,
– the air unit.
NOTE: the injectors may be replaced individually.
Remove the HP pipe using the tool Mot. 1383.
Insert the plugs to maintain cleanness.
Remove:
– the injector mounting clamp,
– the injector,
– the flame shield washer.YOU SHOULD FOLLOW THE CLEANNESS INSTRUCTIONS CLOSELY
16192-2S

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Injectors
13
13-34
CLEANING
It is absolutely forbidden to use the following when
cleaning the injector:
– a metallic brush,
– an emery cloth,
– an ultrasound cleaner.
To clean the nose of the injector, let it soak in
degreaser, then wipe is with a lint-free cloth.
Clean the injector point.REFITTING
Change the washer beneath the injector.
DI1326

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Injectors
13
13-35
NOTE: be careful when refitting that you do not stress the HP pipe. Remove
the injection rail.
Fit:
– the injector,
– the diesel return pipe.
16192-1S

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Injectors
13
13-36
Fit the high pressure pipe.
Loosen the high pressure pump/rail pipe.
Tighten to torque:
– the injector,
– the injector side connections, then the injection rail connections,
– the rail.
– the pump/rail pipe (high pressure pump side under pressure).
NOTE: it is essential that you replace the fuel return pipe placed on the
injectors during removal.
16192S
After any intervention, check that there are no leaks in the diesel circuit.
Start the engine at idling speed until the fan starts up, then accelerate
several times under no load.

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Checking diesel pressure and flow
13
13-37
Checking diesel pressure and flow
It is possible to check the pressure and flow in the low pressure fuel circuit.
The low pressure is delivered by the supercharging pump (electric pump located under the diesel filter designed to
feed the high pressure pump).
SPECIAL TOOLING REQUIRED
Mot. 1311-01
Pressure gauge or
Mot. 1328
Mot. 1311-08 Pressure measuring connector
ESSENTIAL SPECIAL TOOLING
Graduated 2000 ml test tube
CHECK LOW PRESSURE
(SUPERCHARGING PUMP)
Place a "T" connector Mot. 1311-08, to position the
pressure gauge Mot. 1311-01 or Mot. 1328 at the
outlet (S) of the fuel filter or at the HP pump inlet.
Turn the fuel pump using the diagnostic tool or by
directly feeding the pump (each time the ignition is
switched on the low pressure pump is supplied for
30 seconds).
Measure the pressure which should be between
2.5 and 4 bars.CHECK THE FLOW (SUPERCHARGING PUMP)
Make the pump flow into a 2000 ml graduated test
tube. Turn on the ignition to run the pump. The pump is
supplied for 30 seconds if the engine is not started.
The flow read should be 80 to 100 litres/hour
minimum.
IMPORTANT: it is forbidden to measure the
pressure and the flow of the high pressure pump.
15773R1