catalytic converter RENAULT TWINGO RS 2009 2.G Engine And Peripherals Service Manual

17B-15
PETROL INJECTION
Oxygen sensors: Removal - Refitting
D4F, and 780 or 782
17B
REMOVAL
I - REMOVAL PREPARATION OPERATION
aPosition the vehicle on a two-post lift (see Vehicle:
Towing and lifting) (02A, Lifting equipment).
II - OPERATION FOR REMOVAL OF PART
CONCERNED
1 - Removing the upstream oxygen sensor
aRemove the air filter unit (see 12A, Fuel mixture,
Air filter unit: Removal - Refitting, page 12A-13) .aDisconnect the upstream oxygen sensor connector
(1) .
aUnclip the upstream oxygen sensor connector from
the rocker cover.
aUnclip the upstream oxygen sensor wiring (2) .
aRemove:
-the bolts (3) from the exhaust manifold heat shield,
-the turbocharger heat shield,
-the upstream oxygen sensor (4) from the catalytic
converter using the tool (Mot. 1495-01). Special tooling required
Mot. 1495-0122 mm socket for removal -
refitting of oxygen sensors.
Tightening torquesm
upstream oxygen sen-
sor45 N.m
turbocharger heat shield
bolts8 N.m
downstream oxygen
sensor45 N.m
WARNING
Do not use any product designed to improve the
electr ical contact in the injection computer and oxy-
gen sensor connectors or on the bodies of the oxy-
gen sensors.
Failure to respect this advice causes the oxygen
sensor to malfunction and results in failure to com-
ply with the emission control standard.
WARNING
If the connections are corroded, repair the wiring
(see Wiring: Precautions for repair) (Technical
Note 6015A, 88A, Wiring).
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120957

17B-16
PETROL INJECTION
Oxygen sensors: Removal - Refitting
D4F, and 780 or 782
17B
2 - Removal of the downstream oxygen sensor
aDisconnect the catalytic converter downstream oxy-
gen sensor connector (5) .
aUnclip the downstream oxygen sensor connector
from the catalytic converter.
aUnclip the wiring of the catalytic converter down-
stream oxygen sensor at (6) .
aRemove the downstream oxygen sensor (7) from
the catalytic converter using the tool (Mot. 1495-01).
REFITTING
REFITTING OPERATION FOR PART CONCERNED
1 - Refitting the upstream oxygen sensor
aRefit the upstream oxygen sensor.
aTorque tighten the upstream oxygen sensor (45
N.m) using the (Mot. 1495-01).
aRefit:
-the turbocharger heat shield,
-the turbocharger heat shield bolts.
aTorque tighten the turbocharger heat shield bolts
(8 N.m).
aClip:
-the upstream oxygen sensor wiring,
-the upstream oxygen sensor connector onto the
rocker cover.aConnect the upstream oxygen sensor connector.
aRefit the air filter unit (see 12A, Fuel mixture, Air fil-
ter unit: Removal - Refitting, page 12A-13) .
2 - Refitting the downstream oxygen sensor
aRefit the downstream oxygen sensor.
aTorque tighten the downstream oxygen sensor
(45 N.m) using the tool (Mot. 1495-01).
aClip the downstream oxygen sensor wiring onto the
catalytic converter.
aClip the downstream oxygen sensor connector onto
the catalytic converter.
aConnect the downstream oxygen sensor connector.
121774

17B-18
PETROL INJECTION
Oxygen sensors: Removal - Refitting
K4M
17B
REFITTING THE UPSTREAM OXYGEN
SENSOR
I - REFITTING PREPARATION OPERATION
aClean the threading of the upstream oxygen sensor
using a WIRE BRUSH.
aUse SURFACE CLEANER (see Vehicle: Parts
and consumables for the repair) (04B, Consuma-
bles - Products) to clean and degrease:
-the thread hole of the upstream oxygen sensor on
the exhaust manifold,
-the threading of the upstream oxygen sensor if it is
to be reused.
II - REFITTING OPERATION
aRefit the upstream oxygen sensor.
aAngle tighten the upstream oxygen sensor ( 90˚).
aAttach the upstream oxygen sensor wiring.
aConnect the upstream oxygen sensor connector.III - FINAL OPERATION
aRefit:
-the engine undertray.
-the front right-hand wheel arch liner (see Front
wheel arch liner: Removal - Refitting) (55A, Ex-
terior protection),
-the front right-hand wheel (see Wheel: Removal -
Refitting) (35A, Wheels and tyres).
REMOVAL OF THE DOWNSTREAM
OXYGEN SENSOR
I - REMOVAL PREPARATION OPERATION
aDisconnect the battery (see ) (80A, Battery).
aRemove:
-the windscreen wiper arms (see Windscreen wip-
er arm: Removal - Refitting) (85A, Wiping -
Washing),
-the scuttle panel grille (see Scuttle panel grille:
Removal - Refitting) (56A, Exterior equipment),
-the scoop under the scuttle panel grille (see Scoop
under the scuttle panel grille: Removal - Refit-
ting) (56A, Exterior equipment).
132539
Note:
For angular tightening, make a mark (6) on the
catalytic pre-converter in the middle of the flat
surface of the upstream oxygen sensor. Move the
upstream oxygen sensor stop (7) to the mark (6)
.

19B-8
EXHAUST
Exhaust: Precautions for the repair
19B
I - PARTS AND CONSUMABLES FOR THE REPAIR
1 - Parts always to be replaced:
- the exhaust trunking (if fitted)
- the seal or sealing ring on the connection between the
catalytic converter or catalytic pre-converter and the
rest of the exhaust system
- the exhaust clip(s) (if fitted)
2 - Consumables (see part no. in Technical Note
5068, 04B, Consumables - Products):
- exhaust mastic
- surface cleaner
- abrasive pads
II - ADVICE TO OBSERVE
1 - During removal and refitting, the catalytic converter
or catalytic pre-converter must not receive any knocks
or impacts as this could damage it.
2 - The whole exhaust pipe is made of stainless steel.
3 - After working on the bracket between the catalytic
converter or catalytic pre-converter and the rest of the
exhaust system, ensure that the connection is perfectly
sealed.
To do this:
-clean the pressure faces of the connection using the
ABRASIVE PADS,-degrease the pressure faces of the connection using
SURFACE CLEANER and clean cloths,
-always replace the seal or sealing ring on the connec-
tion.
III - SPECIAL NOTES ON THE SINGLE UNIT
EXHAUST PIPE
1 - Cutting the single unit exhaust pipe
The exhaust pipe is a « single unit type » .
To replace different parts of the exhaust system it must
be cut.
To do this be sure to carry out these precautions in the
following order:
-correctly identify the area to be cut, as explained be-
low,
-use the cutting tool correctly (Mot. 1199-01),
-position the exhaust trunking correctly.
2 - Identifying the area of the exhaust system to be
cut
Two marks made on the exhaust system define the
area to be cut (see Exhaust: Parts and consumables
for the repair) (see MR for vehicle concerned, 19B,
Exhaust).
Example of cutting area Special tooling required
Mot. 1199-01Exhaust pipe cutter (diame-
ter 35/50 mm and diameter
50/65mm). Complete kit in a
case.
IMPORTANT
Do not park and run the engine in a place where
combustible substances and materials such as
grass or leaves can come into contact with the hot
exhaust system.
IMPORTANT
Catalytic converters contain ceramic fibres , these
are contained within a closed unit, and cannot dis-
perse. Drilling or cutting catalytic converters is pro-
hibited.
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19B-12
EXHAUST
Catalytic converter: Removal - Refitting
K9K
19B
PARTS AND CONSUMABLES FOR THE REPAIR
Pièces à remplacer systématiquement :
-air inlet pipe seals,
-the catalytic converter seal on the turbocharger,
-any stud and/or nut on the turbocharger or damaged
catalytic converter,
-The exhaust system sealing ring on the catalytic con-
verter.
Ingrédients :
-ABRASIVE PADS,
-SURFACE CLEANER.
REMOVAL
I - REMOVAL PREPARATION OPERATION
aPosition the vehicle on a two-post lift ( (see Vehicle:
Towing and lifting) ).
aDisconnect the battery ( (see Battery: Removal -
Refitting) ).
aRemove:
-the windscreen wiper arms ( (see Windscreen
wiper arm: Removal - Refitting) ),
-the scuttle panel grille ( (see Scuttle panel grille:
Removal - Refitting) ),
-the scoop under the scuttle panel grille ( (see
Scoop under the scuttle panel grille: Removal -
Refitting) ),
-the air filter box (see 12A, Fuel mixture, Air filter
unit: Removal - Refitting, page 12A-13) .
II - OPERATION FOR REMOVAL OF PART
CONCERNED
aRemove the catalytic converter bolts (1) on the tur-
bocharger.
aRaise the vehicle.
aRemove the engine tie-bar (see 19D, Engine
mounting, Lower engine tie-bar: Removal - Refit-
ting, page 19D-18) . Tightening torquesm
catalytic converter studs
on the turbocharger9 Nm
catalytic converter nuts
on the turbocharger26 Nm
catalytic converter
upstream strut bolts on
the engine44 Nm
catalytic converter
downstream strut bolts
on the gearbox21 Nm
catalytic converter
downstream strut nut on
the gearbox21 Nm
catalytic converter
upstream strut bolts on
the catalytic converter26 Nm
catalytic converter
downstream strut bolt
on the catalytic con-
verter21 Nm
exhaust pipe bolts on
the catalytic converter21 Nm
IMPORTANT
Consult the safety and cleanliness advice and oper-
ation recommendations before carrying out any
repair (see 19B, Exhaust, Exhaust: Precautions
for the repair, page 19B-8) .
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19B-13
EXHAUST
Catalytic converter: Removal - Refitting
K9K
19B
aRemove:
-the catalytic converter downstream strut bolts (2) ,
-the catalytic converter downstream strut nut (3) .aRemove:
-the exhaust pipe springs and bolts (4) on the cata-
lytic converter,
-the sealing ring of the exhaust pipe on the catalytic
converter and throw it in the bin.
aRemove the exhaust pipe towards the rear of the ve-
hicle.
aRemove the catalytic converter upstream strut bolts
(5) .
aRemove the catalytic converter from the studs on
the turbocharger.
aRemove the seal between the catalytic converter
and the turbocharger and throw it in the bin.
REFITTING
I - REFITTING PREPARATION OPERATION
aUse ABRASIVE PADS to clean the bearing faces:
-the turbocharger and the catalytic converter,
-the catalytic converter and the exhaust system.
aNext, clean the bearing faces with SURFACE
CLEANER ( (see Vehicle: Parts and consum-
ables for the repair) ) and clean cloths.
106199112328
Note:
Remove the exhaust pipe from its underbody
mountings to push it back further, if necessary.

19B-14
EXHAUST
Catalytic converter: Removal - Refitting
K9K
19B
aIf they are replaced, torque tighten the catalytic
converter studs on the turbocharger (9 Nm ).
II - REFITTING OPERATION FOR PART
CONCERNED
aFrom underneath the vehicle, fit:
-the catalytic converter on the turbocharger fitted
with a new seal between the catalytic converter
and the turbocharger,
-one of the catalytic converter nuts on the turbo-
charger.
aIn order, fit (without tightening):
-the catalytic converter upstream strut bolts on the
engine,
-the catalytic converter downstream strut bolt and
nut on the gearbox,
-the catalytic converter upstream strut bolts on the
catalytic converter,
-the catalytic converter downstream strut bolt on the
catalytic converter,
-the catalytic converter nuts on the turbocharger,
aTorque tighten and in order:
-the catalytic converter nuts on the turbocharger
(26 Nm),
-the catalytic converter upstream strut bolts on
the engine (44 Nm),
-the catalytic converter downstream strut bolts
on the gearbox (21 Nm),
-the catalytic converter downstream strut nut on
the gearbox (21 Nm),
-the catalytic converter upstream strut bolts on
the catalytic converter (26 Nm),
-the catalytic converter downstream strut bolt
on the catalytic converter (21 Nm).
aFit in order:
-a new exhaust system sealing ring on the catalytic
converter,
-the exhaust pipe on the catalytic converter,
-the exhaust pipe springs and bolts on the catalytic
converter.aTorque tighten the exhaust pipe bolts on the cata-
lytic converter (21 Nm).
aCheck the following and deal with if necessary:
-that there is no contact with the underbody,
-the presence and correct positioning of all the ex-
haust pipe heat shields.
III - FINAL OPERATION.
aRefit:
-the engine tie-bar (see 19D, Engine mounting,
Lower engine tie-bar: Removal - Refitting, page
19D-18) ,
-the air filter box (see 12A, Fuel mixture, Air filter
unit: Removal - Refitting, page 12A-13) ,
-the scoop under the scuttle panel grille ( (see
Scoop under the scuttle panel grille: Removal -
Refitting) ),
-the scuttle panel grille ( (see Scuttle panel grille:
Removal - Refitting) ),
-the windscreen wiper arms ( (see Windscreen
wiper arm: Removal - Refitting) ).
aConnect the battery ( (see Battery: Removal - Re-
fitting) ).
aStart the engine.
aCheck that there are no leaks and deal with them if
necessary. Note:
Check that there is no contact between the cata-
lytic conver ter and the turbocharger oil return
pipe during the entire catalytic converter tighten-
ing operation.

19B-15
EXHAUST
Catalytic converter: Removal - Refitting
D4F, and 772 – D7F
19B
REMOVAL
I - REMOVAL PREPARATION OPERATION
aPosition the vehicle on a two-post lift (see Vehicle:
Towing and lifting) (02A, Lifting equipment).
aDisconnect the downstream oxygen sensor connec-
tor.
aUnclip the wiring harness from the downstream oxy-
gen sensor.
aDisconnect the upstream oxygen sensor connector.
aUnpick the wiring harness from the upstream oxy-
gen sensor.
II - OPERATION FOR REMOVAL OF PART
CONCERNED
aRemove:
-the clip (1) between the catalytic converter and the
intermediate pipe,
-the bolts (2) from the exhaust flange,
-the catalytic converter,
-the exhaust pipe sealing ring on the catalytic con-
verter.
Dismantling the catalytic converter
aUsing the (Mot. 1495-01), remove:
-the downstream oxygen sensor,
-the upstream oxygen sensor.
REFITTING
I - REFITTING PREPARATION OPERATION
Reassembling the catalytic converter
aUsing the (Mot. 1495-01), refit:
-the upstream oxygen sensor,
-the downstream oxygen sensor.
II - REFITTING OPERATION FOR PART
CONCERNED
a
aRefit:
-the catalytic converter,
-the exhaust bracket bolts,
-the clip between the catalytic converter and the in-
termediate pipe.
aTighten:
-the exhaust bracket bolts,
-the clip between the catalytic converter and the in-
termediate pipe.
III - FINAL OPERATION
aClip the upstream oxygen sensor wiring harness into
place.
aConnect the upstream oxygen sensor connector.
aAttach the downstream oxygen sensor wiring har-
ness.
aConnect the downstream oxygen sensor connector. Special tooling required
Mot. 1495-0122 mm socket for removal -
refitting of oxygen sensors.
121731
WARNING
Always replace the sealing ring between the cat-
alytic con verter and the exhaust pipe with a new
component.

19B-16
EXHAUST
Catalytic converter: Removal - Refitting
D4F, and 780 or 782
19B
REMOVAL
I - REMOVAL PREPARATION OPERATION
aPosition the vehicle on a two-post lift (see Vehicle:
Towing and lifting) (MR 411, 02A, Lifting equip-
ment).
aDisconnect the battery (see Battery: Removal - Re-
fitting) (MR 411, 80A, Battery).
aRemove:
-the air filter unit (see 12A, Fuel mixture, Air filter
unit: Removal - Refitting, page 12A-13) ,
-the air filter box strut bolt,-the air filter box strut,
-the upstream oxygen sensor (see 17B, Petrol in-
jection, Oxygen sensors: Removal - Refitting,
page 17B-13) . Tightening torquesm
catalytic converter lower
bracket bolt on the gear-
box44 N.m
bolts of the catalytic
converter lower bracket
on the engine25 N.m
side bracket bolts on the
catalytic converter21 N.m
side bracket bolts on the
engine21 N.m
catalytic converter nuts
on the turbocharger (ini-
tial torque)20 N.m
catalytic converter nuts
on the turbocharger30 N.m
bolts of the catalytic
converter lower bracket
on the catalytic con-
verter (initial torque)20 N.m
bolts of the catalytic
converter lower bracket
on the catalytic con-
verter30 N.m
exhaust downpipe bolts21 N.m
catalytic converter strut
nut21 N.m
catalytic converter strut
bolt on the rocker cover21 N.m

19B-17
EXHAUST
Catalytic converter: Removal - Refitting
D4F, and 780 or 782
19B
aRemove the turbocharger air outlet rigid pipe bolt (1)
from the throttle valve.
aDetach the turbocharger air outlet pipe from the tur-
bocharger in the direction of the arrow (2) .
aDisconnect the turbocharger air outlet pipe from the
turbocharger.aMove aside the turbocharger air outlet pipe.
aRemove:
-the catalytic converter strut nut (4) ,
-the catalytic converter strut bolt (5) from the rocker
cover,
-the turbocharger strut.
-the rear suspended engine mounting (see 19D,
Engine mounting, Lower engine tie-bar: Re-
moval - Refitting, page 19D-18) .
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122673
Note:
Removing the heat-resistance protector clip (3)
requires the turbocharger air outlet pipe to be
replaced.
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