RENAULT MEGANE SCENIC 1995 Service Repair Manual

EXHAUST
Exhaust pipe assembly
19
PRESENTATION OF EXHAUST PIPES AND CUTTING ZONES
99236R
1 Catalytic converter
2 Expansion chamber
3 Silencer
ZC Exhaust pipe cutting zone
99235R
F3R engine F8Q engine
without catalytic converter
19-17

EXHAUST
Exhaust pipe assembly
19
PRESENTATION OF EXHAUST PIPES AND CUTTING ZONES
99234R
1 Catalytic converter
2 Silencer
ZC Exhaust pipe cutting zoneF8Q engine
with catalytic converter
19-18

Mot. 1199 Exhaust pipe cutting tool
Mot. 1265
Pliers for removing quick release
unions
Mot 1265-01
FUEL TANK
Fuel tank
19
IMPORTANT :
during the complete removal and refitting opera-
tion, do not smoke and keep all heat sources
away from the working area.
DRAINING THE FUEL TANK (petrol version)
Remove the plastic access cover (under the rear
right hand seat).
Remove the clip (if fitted).
Disconnect the quick release union (1), Mot. 1265
(see below for details on fitting the pliers).
EQUIPMENT REQUIRED
INTAIRCO pneumatic pump for draining the fuel tank
(petrol or diesel), (see EQUIPMENT 95 catalogue).
Piston pump 333 (for draining diesel fuel tank).
SPECIAL TOOLING REQUIRED
97163R2
Fit a pipe onto outlet (A) long enough to empty
into a container outside the vehicle.
Note : the INTAIRCO pneumatic pump may also be
used (
see EQUIPMENT 95 catalogue) or piston
pump 333. Refer to your After Sales Head Office
for more details.
19-19

FUEL TANK
Fuel tank
19
In the engine compartment, disconnect the fuel
pump relay (identifiable as it has larger section
wires , 5 mm
2 , on tracks 3 and 5) located in the
engine connection unit.
98756R1
DRAINING THE FUEL TANK (diesel version)
As there is no electric fuel pump, a pump must be
used to drain the fuel tank.
Use for example:
- the INTAIRCO pneumatic pump (see
EQUIPMENT 95 catalogue),
B - Fuel relay
Shunt tracks 3 and 5 and allow the fuel to run out
until it is only pumped out intermittently.
Disconnect the shunt.
Reconnect the relay.
Disconnect the battery.- piston pump 333. Refer to your After Sales
Head Office for more details.
76003S
99641S
19-20

FUEL TANK
Fuel tank
19
REMOVING THE FUEL TANK (petrol or diesel ver-
sions)
Vehicle on a 2 post lift.
Disconnect the electrical connector (2) and the
quick release unions , Mot. 1265 or Mot. 1265-01
(see below for positioning the pliers).
97163R4
Remove the heat shields (3) and (4) and the strut
(5).
Lift the vehicle.
Remove the silencer, use the pipe cutting tool
Mot. 1199 (see Exhaust section).Measure dimension X before releasing the hand-
brake adjuster.
99090R
Slacken the adjuster to release the left and right
hand cables (release the plastic cable stop with
care).
99091R
19-21

FUEL TANK
Fuel tank
19
Disconnect the pipes from the fuel tank filler neck
using tool Mot. 1265.
Fit a jack under the fuel tank.
Remove the 3 mounting bolts at the front of the
fuel tank.
Slacken the mounting bolts for the rear mounting
sufficiently to allow the fuel tank to be released.
IMPORTANT:
when removing the fuel tank, release the brake
pipes sufficiently to avoid deforming them.Mot. 1265 : 8 mm diameter pipe.
Mot. 1265-01 : 10 mm diameter pipe (diesel fuel
supply circuit).REFITTING
Refitting is the reverse of removal.
Take care not to compress the pipes (risk of a
leak).
Fit the quick release unions by hand and ensure
they click together correctly (two O rings ensure
sealing).
Take care to ensure the heat shields are correctly
refitted.
96420R2
99216S
19-22

FUEL TANK
Filler neck
19
UNLEADED PETROL
1 - Filler neck outlet - fuel passage
2 - Degassing when filling
3 - Breather
4 - Connection to canister (petrol vapour)
DIESEL
DI1903 DI1904
DI1905
A - Overfilling valve
B - Excess - insufficient pressure safety valve
C - Restriction valve
D - Valve preventing leaks if the vehicle is turned
over
PRG19.3
19-23

FUEL TANK
Filler neck
19
ROLE OF THE VALVES
A) Over-filling valve
When the fuel filler cap is removed, the valve
is closed, locking a volume of air in the brea-
ther chamber. This prevents fuel from ente-
ring this chamber.
When the filler cap is replaced, the valve
opens and the fuel tank breather is again
connected to the canister.
B) Excess - insufficient pressure safety valve
If the fuel vapour recirculation circuit is
blocked, this valve prevents the fuel tank from
excess pressure (the fuel tank would other-
wise inflate) or insufficient pressure (as fuel is
used, the fuel tank would be crushed).
C) Restriction valve
This valve prevents leaded fuel from entering
the fuel tank.
D) Valve preventing leaks if the vehicle is turned
over
If the vehicle is turned over, this valve pre-
vents the fuel tank from emptying, either
through the pipe to the canister or the brea-
ther pipe (Diesel).
The fuel tank has a sealed filler cap and a ventila-
tion circuit.
The filler neck for unleaded fuel has:
- an opening which is narrower and incompati-
ble with a leaded fuel pump nozzle (lead would
pollute the depollution system: the oxygen
sensor and catalytic converter),
- a valve blocking the filling opening (C) (to pre-
vent fuel vapour evaporating or fuel coming
out of the tank).
Refitting the fuel filler cap releases the over-filling
valve (A), allowing the tank to breathe through
the breather.
99212R
19-24

FUEL TANK
Gauge
19
For petrol engines, the pump and gauge sender
unit are an inseparable assembly.
For diesel engines, there is no pump submerged in
the fuel tank, there is only a gauge sender unit.
For removing the gauge sender unit refer to the
section FUEL TANK "Pump - sender unit".
Checking the gauge sender unit
Ensure the resistance varies by moving the float.
DisplayValue between terminals
A1 and B1 (in Ω)
4/4 7 maximum
3/4 54.5 ± 7
1/2 98 ± 10
1/4 155 ± 16
Minimum 300 ± 20
Display Height H (in mm)
4/4 48
3/4 90
1/2 133
1/4 147
Minimum 190
Measuring the height H
With the gauge sender unit removed, place it on a
flat surface.
H is the height measured between the float pin
and the working surface.
NOTE : these value are given for information only.
19-25

Mot. 1264-01 Wrench for removing the pump -
sender unit nut.
Mot. 1265 Pliers for removing quick release
unions (petrol engine)
Mot. 1265-01 Pliers for removing quick release
unions (diesel engine)
FUEL TANK
Pump and sender unit
19
SPECIAL TOOLING REQUIRED
IMPORTANT :
During all operations on the fuel tank or fuel sup-
ply circuit, it is vital to:
- avoid smoking and keep all heat sources away
from the working area,
- take precautions against fuel splashes due to
the residual pressure in the fuel pipes when
they are removed.
REMOVAL
The fuel tank does not need to be removed to re-
move the pump and sender unit assembly. It may
be reached from inside the vehicle as follows :
- disconnect the battery,
- lift the rear bench seat,
- remove the plastic cover,
- disconnect the electrical connector (1),
- remove the clips (2).
97163R5
19-26