RENAULT MEGANE SCENIC 1995 Service Repair Manual

DIESEL EQUIPMENT
Pre-post-heating unit
13
FAULT FINDING
4. Engine operation fault (difficulty in starting, idle speed unstable, noise...)
Check:
- the feed to the pre-post-heating unit :
•+before ignition at connector A.
•+after ignition on track B1 of connector C.
•earth on track C2 of connector C.
- at the pump connector, the resistance of the ALFB solenoid valve (between earth and track
A1) : 7Ω ± 0.5,
- the coherence of the temperature reading given by the coolant temperature sensor,
Temperature (°C) 25 80
Resistance (Ω) 2 610 to 2 990 310 to 350
- the adjustment and operation of the post-heating microswitch,
- the coherence of the open or closed status of the altimetric capsule switch according to the altimetric
pressure of the test site (the switch should be closed for a pressure > 925 ± 20 mbars).
If the fault persists carry out a complete re-adjustment of the pump.
13-35

DI1306
DIESEL EQUIPMENT
Injector holder - heater plug
13
94952R1
1 + 2Injector holder assembly.
3Seal between the injector holder assembly
and the cylinder head.
4Flame arresting washer.
5Injector protector.
The injector holder assembly is screwed into the
cylinder head.
In order to remove the injector high pressure
pipes, use wrench B.Vi. 868 . To remove the
injector holder assembly, use the 27 mm long
socketMot. 997.
The following tightening torques must be
observed:
- lower section (2) on upper section (1) of the
injector holder : 7 ± 1 daN.m,
- injector holder on cylinder head: 7 ± 1 daN.m.
Each time an injector holder is removed, the
copper seal and the flame arresting washer must
be renewed.
SPECIFICATIONS
Injector holder (A)
Position of the flame arresting washer
Injector nose
To pre-combustion chamber
Heater plug (B)
Current: 15A after 8 seconds heating
Tightening torque : 2 daN.m
13-36

DIESEL EQUIPMENT
Fuel filter
13
LOCATION
Principle of the electric heater
The heater has heated studs. They are ceramic,
made from barium titanate which has a positive
temperature coefficient, meaning that its
resistance increases as its temperature increases.
99332R
1Fuel filter
2Electric heater
3Hand priming unit
The electric diesel fuel heater and the thermostat
are integral in the head of the filter.
DIAGRAM
PRJ99258
449Electric heater
450Diesel heating relay
597Engine fuse box
645Passenger compartment fuse box Operating temperature
Electrical circuit closes: 0°C
Electrical circuit opens: from 8°C
Heater power: 150 W
13-37

99461R
DIESEL EQUIPMENT
Fuel filter
13
REMOVAL - REFITTING (Special notes)
To remove the filter assembly use tool Mot. 1311-
06 for the quick release unions.
When refitting, refit the quick release unions by
hand and ensure they click back together correctly
(two O rings ensure sealing).
99332S
13-38

DIESEL EQUIPMENT
Coolant temperature sensor
13
LOCATION
Temperature sensor (1) (black connector)
DIAGRAM
98904RDI1307
The sensor has two functions
•Thermistor (tracks 2 and 3) :
i.e. a resistance which varies with coolant
temperature. The tracks are connected to the
pre-post-heating unit.
•Temperature switch (tracks 1 and 4) :
for operating the EGR solenoid valve.SPECIFICATIONS
Thermistor
Temperature in °C ± 1
Switch status
30closed
20open
Temperature in °C ± 1Resistance Ω
252 610 to 2 990
80310 to 350
Temperature switch
13-39

PRJ1302
DIESEL EQUIPMENT
Inlet - exhaust manifolds
13
Manifold mounting nuts 2.5
Tightening torques (in daN.m)
REMOVAL
Vehicle on a lift, battery disconnected, remove:
- the bar between the shock absorber turrets,
-
• the air inlet pipes,
•the oil vapour rebreathing pipes,
•the EGR control pipe (if fitted),
- bolt (1) on the inlet manifold.
From under the vehicle:
Remove:
- the engine undertray,
- the exhaust downpipe.Then remove the ten mounting nuts for the
manifolds to release them.
REFITTING
Refitting is the reverse of removal.
Renew:
- the manifold gasket,
- the two exhaust downpipe gaskets.
13-40

PUMP
Brake assistance vacuum pump
13
Renew the drive dog systematically when
replacing the pump.
CHECKING
Engine warm, at 4 000 rpm, the minimum vacuum
should be 700 mbars (525 mmHg) in 3 seconds.
SPECIAL TOOLING REQUIRED
M.S. 870 Vacuum gauge
PRJ1303
F8Q engine
13-41

PUMP
Mechanical power assisted steering pump
13
REPLACING THE PULLEY
REMOVAL
Remove the component by removing the three
bolts.
98829R
REFITTING
Refitting is the reverse of removal.
FILLING THE CIRCUIT
Oil grade to be used:
ELF RENAULTMATIC D2
orMOBILATF 220
Capacity : 1.1 litres
Fill the reservoir to the top.
Move the steering wheel gently in both
directions.
Top up the level.
Start the engine and move the steering wheel
gently from full lock to full lock.
Top up the level.
91662-1S
The oil should be visible to the level of the
MAXIMUM line.
13-42

PUMP
Mechanical power assisted steering pump
13
E and K engines
without AC
SPECIAL TOOLING REQUIRED
Mot. 453-01 Hose clamp pliers
REMOVAL
Slacken the tensioner nut and lock nut assembly
(A).
Release the two upper mounting bolts (B) and (C)
for the pump.
96047R
Remove bolt (D) using a half moon polygon
wrench.
Remove the belt.
Fit clamp Mot. 453-01 to the supply pipe.
Disconnect the supply and high pressure pipes.
Remove the upper pump mounting bolt (C).
Remove the pump.
96047-1R
REFITTING
Insert bolt (B).
Refit :
- the pump,
- the belt,
- the supply and high pressure pipes.
Remove clamp Mot. 453-01.
Adjust the belt tension (see section "Adjustment
values").
Fill and bleed the circuit by moving the steering
wheel gently from lock to lock.
13-43

PUMP
Mechanical power assisted steering pump
13
F8Q engine
with AC
SPECIAL TOOLING REQUIRED
Mot. 453-01 Hose clamp pliers
REMOVAL
Remove the belt (see corresponding section).
Fit clamp Mot. 453-01 to the supply pipe.
Remove:
- the pulley (three bolts),
- the wiring mounting and the high pressure
pipe by removing bolt (2),
99171R
99170R
REFITTING
Refitting is the reverse of removal.
99174-1R
- the supply pipe and the high pressure pipe,
- the three pump mounting bolts.
Remove the pump.
13-44