RENAULT MEGANE SCENIC 1995 Service Repair Manual

COOLING
Diagram
19
1 Engine
2 Radiator
3 Expansion bottle with degassing after ther-
mostat
4 Heater matrix
5 Thermostat mounting
6 3 mm diameter restriction
7 6 mm diameter restrictionWater pump
Thermostat
Bleed valve
Temperature switch
The rating of the expansion bottle cap is 1.2 bar
(brown).
99416R
F8Q ENGINE / AC
19-7

COOLING
Diagram
19
1 Engine
2 Radiator
3 Expansion bottle with degassing after ther-
mostat
4 Heater matrix
5 Thermostat mounting
6 Throttle body
7 3 mm diameter restriction
8 8 mm diameter restrictionWater pump
Thermostat
Bleed valve
Temperature switch
The rating of the expansion bottle cap is 1.6 bar
(blue).
99415R
F3R ENGINE
19-8

COOLING
Diagram
19
1 Engine
2 Radiator
3 Expansion bottle with degassing after ther-
mostat
4 Heater matrix
5 Thermostat mounting
6 Inlet manifold
7 10 mm diameter restriction
8 3 mm diameter restrictionWater pump
Thermostat
Bleed valve
Temperature switch
The rating of the expansion bottle cap is 1.2 bar
(brown).
99414R
E7J ENGINE
19-9

COOLING
Diagram
19
1 Engine
2 Radiator
3 Expansion bottle with degassing after ther-
mostat
4 Heater matrix
5 Thermostat mounting
6 3 mm diameter restrictionWater pump
Thermostat
Bleed valve
Temperature switch
The rating of the expansion bottle cap is 1.6 bar
(blue).
99413R
K7M ENGINE
19-10

COOLING
Diagram
19
1 Engine
2 Radiator
3 Expansion bottle with degassing after ther-
mostat
4 Heater matrix
5 Thermostat mounting
6 Automatic transmission oil temperature ex-
changer
7 3 mm diameter restriction
8 6 mm diameter restrictionWater pump
Thermostat
Bleed valve
Temperature switch
The rating of the expansion bottle cap is 1.6 bar
(blue).
99412R
K7M ENGINE / AT
19-11

EXHAUST
General
19
EXHAUST PIPE MOUNTINGS UNDER THE BODY
The exhaust pipe is attached under the body using
rubber mountings.
These may generally be released by hand by lif-
ting the exhaust pipe.
In certain cases however, the retaining bolts for
mounting (A) under the body may have to be
slackened to release the rubber mountings more
easily. The catalytic converter reaches high temperatures
during operation and consequently the vehicle
should never be parked in an area where there is
combustible material which could come into
contact with the exhaust and pose a fire risk.
Under certain conditions, this type of material
could catch fire.
IMPORTANT:
- sealing between the exhaust manifold gasket
face and the catalytic converter must be per-
fect,
- any seals removed
MUST be renewed (especial-
ly at the catalytic converter flange),
- during removal and refitting the catalytic
converter should not be subjected to repeated
mechanical impacts as it may be damaged.
CUTTING THE EXHAUST PIPE
The exhaust pipes are of monoblock construction.
This means there is no break between the inlet to
the catalytic converter or the expansion chamber
and the silencer outlet.
If one of the components requires replacement as
an After Sales operation, the exhaust pipe must
be cut.
To do this:
- mark up the cutting line correctly,
- use the cutting tool Mot. 1199,
- fit the After Sales sleeve.
99225R
19-12

EXHAUST
General
19
MARKING UP THE CUTTING LINE
The cutting line is marked by two punched marks
in the exhaust pipe.
DI1901
99226-1R
There are a maximum (depending on engine) of
two cutting zones on the exhaust pipe, located
between the catalytic converter and the expan-
sion chamber and between the expansion cham-
ber and the silencer.
The distance between the two markers is 90 mm.
To cut the pipe, mark the centre point (D) bet-
ween the two markers (P
1 and P2).
90 mm
P
1P
2 D
USING TOOL MOT. 1199
Fit tool Mot. 1199 to the exhaust pipe.
99226R
Slacken the chain as far as possible (unscrew) and
pass it around the pipe. Attach the chain to the
tool.
Tighten and pivot the tool around the pipe, while
tightening the chain (screw in) as cutting proceeds
(do not tighten the tool on the pipe too much to
ensure it cuts without deforming the pipe).
19-13

EXHAUST
General
19
POSITIONING THE AFTER SALES SLEEVE
95478R1
Once a clip has been fitted once, do not re-use it.
To avoid any leaks from the exhaust, it is impor-
tant to position the sleeve over the two exhaust
pipes correctly. This means that the pipe should fit
against the lugs inside the sleeve.
Begin by positioning the sleeve on the old section
of the exhaust pipe then adjust the diameter of
the clip by tightening it gently.
Check the positioning of the pipe on the lugs.
Fit the new replaced part.
Before fitting the sleeve on the pipe, mastic may
be applied to the inner ring of the sleeve to pre-
vent a leak.
(Exhaust mastic Part Number : 77 01 421 161
SODICAM).
IMPORTANT :
the bolt and nut assembly on the
sleeve must be aligned vertically to avoid any risk
of contact with the body.The nut on the clip has a groove (A) to ensure the
clip is tightened to the correct torque. When tigh-
tening, when this groove is no longer visible, it
clicks and the nut is then tightened correctly (2.5
daN.m).
NOTE:
there are 2 sleeves of different diameters :
- 50 mm diameter : F3R- K7M - E7J engines
- 45 mm diameter : F8Q engine
IMPORTANT:
- check there is no contact between the exhaust
pipe and the body,
- check the exhaust pipe heat shields are in good
condition and are all present.
99227S
19-14

EXHAUST
Catalytic converter
19
NOISE FROM THE EXHAUST PIPE
The vehicle should be tested in order to localise
the source of the noise (if necessary with the cu-
stomer present). The fault should then be repro-
duced when the vehicle is stationary, if possible.
To do this, accelerate sharply in order to cover a
wide range of engine resonance.
Having reproduced the noise:
- ensure there is no contact between the
exhaust pipe and the vehicle body,
- check the alignment, conformity and
condition of the exhaust system,
- attempt to eliminate the noise noted by
tightening the exhaust pipe or the heat
shields at fault.
If the noise is found to be caused by the catalytic
converter, remove it and carry out the following
checks:
- visual examination of the inside of the shell
(melted monolyth).
- listen to the catalytic converter after shaking
it (split monolyth or foreign body present).
If the monolyth has melted, the cause must be
determined (see chapter 14: checks to be made
before the anti-pollution test) and check that
catalytic particles have not blocked the exhaust
system further down the pipe.
Only if one of the observations specified above is
noted should the catalytic converter be replaced.
19-15

EXHAUST
Exhaust pipe assembly
19
PRESENTATION OF EXHAUST PIPES AND CUTTING ZONES
99233R
1 Expansion chamber
2 Silencer
ZC Exhaust pipe cutting zone
99237R
E7J engine K7M engine
19-16