Renault F4R Manual page 440

Turbocharging: Precautions for repair
Essential equipment
parts washer
I - TURBOCHARGER: GENERAL INSTRUCTIONS
For the turbocharging pressure regulator check (see
Fault Finding - Tests) (Technical Note 3419A, 12B,
Turbocharging).
WARNING
It is prohibited to adjust the turbocharger turbochar-
ging pressure regulator rod.
WARNING
Ensure that no foreign bodies enter the turbine or
compressor during the refitting operation.
Check that the turbocharger oil return pipe is not
partially or completely blocked by scale. Check that
there are no leaks. If there are, replace the part.
II - TURBOCHARGER CIRCUIT DIAGRAM
(1) Air filter unit
(2) Airflow meter
(3) Compressor wheel
(4) Air-to-air intercooler
(5) Inlet manifold
TURBOCHARGING
112666
12B-4
(6) Exhaust manifold
(7) Turbine wheel
(8) Bearing system (bearing
wheel shaft)
(A) Air filter unit air outlet pipe
(B) Turbocharger air outlet pipe
(C) Intercooler air outlet pipe
III - APPLICATION CONDITIONS FOR THE
INSTRUCTIONS
The instructions below must be followed when repla-
cing a turbocharger due to mechanical damage:
- damage to the bearing system,
- broken shaft or turbine wheel,
- compressor wheel rubbing against the turbocharger
casing,
- broken or damaged compressor wheel,
- extensive clogging of the turbine wheel casing (hard
deposits).
1 - For the air circuit:
- Consequences:
• projections of swarf or metal objects in the inlet and
outlet pipes of the turbocharger,
• splashes of oil in the air circuit (collected in the air-air
intercooler)
- Risks (after replacing the turbocharger):
• metal objects sucked in by the compressor wheel
(destruction of the turbocharger).
2 - For the lubrication circuit:
- Consequences:
• projections of swarf in the engine oil circuit,
• circulation of swarf within the circuit.
- Risks (after replacing the turbocharger):
• premature wear on the bearing system (destruction
of turbocharger).
WARNING
Metal objects may enter the oil and air circuits as
a result of a broken turbocharger.
Failure to observe the following instructions will
lead to the turbocharger breaking again.
12B
+