RENAULT SCENIC 2000 J64 / 1.G Technical Note 3426A Service Manual

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Pressure adjustment
12
12-3
Pressure adjustment
TURBOCHARGING PRESSURE LIMITATION
VALVE (WASTEGATE)
NB: the limitation valve operates in the opposite
way to the usual fittings.
The absence of control pressure causes a
turbocharging pressure limitation.
Check that there are no leaks between the vacuum
pump and the limitation valve.
Checking calibration pressure
Fit on vehicle.
Use a dial gauge which should be positioned at the
end of the wastegate rod (as far as possible in the
wastegate axis).
An underpressure is progressively generated on the
wastegate using a manual vacuum pump.Calibration values
Fitting on the vehicle
When checking the calibration pressure it may be
necessary to adjust the wastegate rod length (A) (if
the pressure is not within tolerance).
This adjustment is made with the turbocharger in
place.
Loosen the lock nut then loosen or tighten the
adjusting nut (B).
Validate the repair in a road test, checking the "RC0
turbocharging limiter valve" parameters and the
"turbocharging pressure" on the diagnostic tools.
17827S
Underpressure
valuesRod movement
(mm)
120 mb Between 1 and 4 mm
400 mb Between 10 and 12 mm
> 450 mb Rod at stop
17827-1R3

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Turbocharger
12
12-4
Turbocharger
SPECIAL TOOLING REQUIRED
Elé. 1294 -01 Tool for removing windscreen
wiper arms
REMOVAL
NOTE: to slacken the turbocharger mounting nuts
more easily on the exhaust manifold, it is useful to
spray a releasing agent on the nuts when still hot, just
before removal.
Disconnect the battery.
Remove the engine cover.
From below
Remove:
– the engine undertray,
– the mounting stay (5),
– the two bolts fixing the turbo oil return pipe (7) to the
engine,
– the lower turbo mounting nut on the exhaust
manifold.
Disconnect the turbo pre-catalytic converter (6)
(priming catalytic converter). TIGHTENING TORQUES (in daN.m )
Turbo mounting nuts (1) 2.4
Oil inlet connection (4) 2.4
Oil inlet connection (3) 2.6
Oil return connection bolt (7) 1.2
Primer catalytic converter mounting bolt
to turbo (2) 2.4
16156R1
16155R1

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Turbocharger
12
12-5
From above
Remove (for the Scénic):
– the windscreen wiper arms using tool Elé. 1294-01,
– the scuttle panel,
– the bulkhead panel,
Disconnect the flow meter and remove the air unit.Remove:
– the turbo oil inlet connection (4),
– the two air intake and outlet ducts connected to the
turbo,
– the two upper turbo mounting nuts on the manifold.
Disconnect the rubber hose (9) (connected to the
wastegate).
11020R
11036R2
12415R6

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Turbocharger
12
12-6
REFITTING
For refitting operations, use the same procedure as for
removal in reverse.
IMPORTANT: you must change the copper gasket at
the turbo oil inlet connection.
IMPORTANT:
Before starting the engine disconnect the pressure
regulator manifold on the high pressure pump.
Then run the starter motor until the oil pressure
warning light goes out (wait a few seconds).
Reconnect the regulator, preheat and start the engine.
Run the engine at idling speed and check that there
are no leaks at the oil connections.
Erase the fault and check the turbocharging pressure
solenoid valve sensor.
16869S
Special precautions
!Before refitting, make sure that the lubrication is
correct for the turbocharger bearings. To do this
activate the starter motor having first
disconnected the high pressure manifold regulator
(do not start the engine) (erase the computer
memory). Sufficient oil should arrive via the oil
pressure pipes (place a container below). If this is
not the case, change the lubrication pipe.
!Ensure that no foreign bodies enter the turbine or
compressor during the refitting operation.
!If there has been a fault in the turbocharger, check
that the air-air exchanger is not full of oil.
If the air-air exchanger is full of oil, it must be
removed, flushed with a cleaning agent and then
left to drain properly.
!Check that the turbocharger oil return pipe is not
partially or completely blocked by scale. Check
also that it is perfectly tight. If not, replace it.

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Air-air exchanger
12
12-7
Air-air exchanger
REMOVAL
It is necessary to remove the bumper to access the air-
air exchanger.
To do this, remove:
– the two upper side mounting bolts (A) (torx 20) and
the lower side mounting bolt (B) (torx 20) from the
front section of the front wing inner protector,
– the three mounting clips (C),
– the mounting clip (D) and separate the front section
of the right and left wing protector.If the vehicle is fitted with fog lights.
Disconnect:
– the battery,
– the fog light wiring harness connector (E) located in
the front section of the left-hand front wheel arch.
Remove:
– the upper side mounting bolt (F) on the bumper (on
each side),
– the two front engine underbody mounting bolts,
98710R2
99184R
99147R

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Air-air exchanger
12
12-8
– the central mounting bolt (torx 40).
Remove the two side positioning centring fittings on
the bumper in relation to the wing.
Remove:
– the bumper by pulling forwards,– the flexible air inlet and outlet ducts on the
exchanger (1),
– three mounting bolts,
– the air-air exchanger.
REFITTING
Refit the unit proceeding in the reverse order to
removal.
98836-1R1
99301R94965R
10320R

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Manifolds
12
12-9
FUEL MIXTURE
Manifolds
REMOVAL
NOTE: Removal of the manifolds requires that you
remove the turbocharger (see section 12
"Turbocharging"). The two manifolds cannot be
removed separately.
Disconnect:
– the battery,
– the air inlet pipe from the intake manifold (2),
– the pipe leading to the pressure sensor on the
manifold (1),
– the EGR (5) solenoid valve.Remove (for the Scénic):
– the windscreen wiper arms,
– the scuttle panel,
– the bulkhead panel,
– the air unit,
– the turbocharger. TIGHTENING TORQUES (in daN.m )
Manifold mounting stud 0.8
Manifold mounting stud 2.8
EGR valve mounting bolt 2.1
16869R2
12415R1

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Manifolds
12
12-10
Remove the EGR solenoid valve pipe and the lifting bracket (4).
16157R

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Manifolds
12
12-11
Remove the nuts securing the manifolds.
If replacement of the inlet manifold is planned, remove the EGR valve (consult section 14 "Antipollution" for the
method).
REFITTING
Proceed in the reverse order to removal.
Change the manifold gasket and take care to replace it properly.Manifolds

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Priming catalytic converter
12
12-12
Priming catalytic converter
REMOVAL
Put the vehicle on a two post lift.
Disconnect the battery.
Remove the cover and the under body protection.
Disconnect the exhaust downpipe.Remove (for the Scénic) :
– the windscreen wiper arms using tool Elé. 1294-01,
– the scuttle panel,
– the bulkhead panel,
Disconnect the flow meter and remove the air unit.
Remove:
– the priming catalytic converter mounting stay,
– the mounting nuts,
– the pre-catalytic converter. TIGHTENING TORQUES (in daN.m )
Priming catalytic converter mounting nuts
(pre-catalytic converter) 2.4
Lower mounting bolt 2.4
Priming catalytic converter stay bolt 6
16156S
11020R
11036R2