torque RENAULT SCENIC 2000 J64 / 1.G Technical Note 3426A User Guide

Downloaded from www.Manualslib.com manuals search engine TURBOCHARGING
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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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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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

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Special notes
13
13-4
OPERATION
The common rail direct high pressure injection system is a sequential diesel injection system (based on the
operation of multipoint injection for petrol engines).
This new injection system reduces operating noise, lowers the quantity of polluting gas and particles and produces
significant engine torque at low engine speeds thanks to a pre-injection procedure.
The low pressure pump (also called the supercharging pump) supplies the HP pump, through the filter with pressure
of between 2.5 and 4 bars.
The HP pump generates the high pressure sent to the injection rail. The pressure regulator located on the pump
modulates the value of the high pressure via the computer. The rail supplies each injector through a steel pipe.
The computer:
– determines the value of injection pressure necessary for the engine to operate well and then controls the pressure
regulator. It checks that the pressure value is correct by analysing the value transmitted by the pressure sensor
located on the rail,
– determines the injection time necessary to deliver the right quantity of diesel and the moment when injection should
be started,
– controls each injector electrically and individually after determining these two values.
The injected flow to the engine is determined depending on:
– the duration of injector control,
– the injector opening and closing speed,
– the needle stroke (determined by the type of injector),
– the nominal injector hydraulic flow (determined by the type of injector),
– the high pressure rail pressure controlled by the computer.
FOR ANY INTERVENTION IN THE HIGH PRESSURE INJECTION SYSTEM YOU MUST RESPECT THE
CLEANING AND SAFETY ADVICE SPECIFIED IN THIS DOCUMENT.

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Special notes
13
13-5
POST-REPAIR CHECK
A fuel cock is fitted to the fuel filter at the level of the diesel return pipe leading to the tank. It should be in open
position for normal operation.
However, to carry out a circuit reignition after an intervention, a filter change or a fuel fault, you should:
– close the fuel cock,
– start the low pressure pump by switching on the ignition several times,
– start the engine,
– OPEN THE FUEL COCK (the valve is open when the two coloured lines are aligned).
NOTE: certain vehicles are not fitted with a fuel cock. In this case, ignore this operation.
IMPORTANT: the engine must not run with diesel containing more than 10 % diester.
The system can inject the diesel into the engine up to a pressure of 1350 bars. Before any intervention, check
that the injector rail is depressurised.
It is absolutely vital that you observe the tightening torque:
– of the high pressure pipes,
– of the injector on the cylinder head,
– of the pressure regulator,
– of the pressure sensor.
When the high pressure pump, injectors, supply, return and high pressure output unions are repaired or
removed, the bores should be fitted with new and appropriate core seals to avoid impurities.
When replacing a high pressure pipe, the following procedure should be observed:
– remove the high pressure pipe,
– fit the cleanliness plugs,
– loosen the high pressure rail and the pump/rail pipe,
– fit the high pressure pipe,
– tighten the injector side union to torque,
– tighten the connection on the high pressure pump side to torque,
– tighten the high pressure rail fastenings to torque.
– tighten the pump/rail pipe to torque (pump side first).
It is prohibited to remove the interior of the pump.
It is vital that you replace the fuel return pipe placed on the injectors during removal.
The diesel temperature sensor is not removable. It is part of the fuel return rail.
It is forbidden to loosen a high pressure pipe connection when the engine is running.After any operation, check that there are no diesel leaks. Start the engine at idling speed until the fan starts up,
then accelerate several times under no load.

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Heater plugs
13
13-18
Heater plugs
The resistance of a heater plug is 0.6 Ω.
Plugs may be removed without having to open the
high pressure circuit.
REMOVAL
Unclip the plug connector.
Clean the plug exterior to avoid any dirt entering the
cylinder.
Undo and then remove the plugs.
To undo the plug on cylinder 4 use a 10 mm long radio
socket attached to a universal joint. Once the plug is
loosened use a pipe socket to unscrew it completely.
REFITTING
Proceed in the reverse order to removal.TIGHTENING TORQUES (in daN.m)
Heater plug 1.5
15762S

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High pressure pump
13
13-23
High pressure pump
IT IS PROHIBITED TO REMOVE THE INTERIOR OF
THE PUMP.
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
Mot. 1054 TDC setting pin
Mot. 1200-01 Pump-pulley retaining tool
Mot. 1383 Tool for removing high pressure
pipes
Mot. 1525 Pulley extractor
Mot. 1525-01 Extractor adaptor for F9Q
ESSENTIAL SPECIAL TOOLING
"Low torque" torque wrench
TIGHTENING TORQUES (in daN.m)
High pressure pipe 2.5±0.2
High pressure pump mounting 3.2± 0.3
High pressure pump pulley nut 5 ± 0.5
Suspended mounting cover bolt 6.2 ± 1
Torque reaction arm bolt 15

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High pressure pump
13
13-25
REFITTING
Refitting is the reverse of removal.
NOTE: be careful not to place the high pressure pipe under stress. Undo the
high pressure rail.
Offer up the high pressure pipe nuts on the pump and rail side.
Tighten the high pressure rail.
Tighten the high pressure pipe connections to torque (high pressure pump
side first).
You must replace the diesel return pipe after each removal.
16192-1S

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Injector rail
13
13-27
Injector rail
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
Mot. 1294 -01 Tool for removing windscreen
wiper arms
Mot. 1383 Tool for removing high pressure
pipes
ESSENTIAL SPECIAL TOOLING
"Low torque" torque wrench
TIGHTENING TORQUES (in daN.m)
High pressure pipe nut 2.5±0.2
Injection rail mounting bolt 2.2±0.2
REMOVAL
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.
11020R
11036R2

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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