Renault F9Q - Turbocharging; Turbocharging: Precautions for Repair

12B-1
TURBOCHARGING
Turbocharging: Precautions for repair
F4R or F9Q or K9K
12B
I - TURBOCHARGER: GENERAL INSTRUCTIONS
To test the turbocharger pressure regulator see Tech-
nical Note 3419A, Turbocharger fault finding, 12B,
Turbocharger, Fault finding - tests.
II - TURBOCHARGER CIRCUIT DIAGRAM
III - APPLICATION CONDITIONS OF
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).
FOR THE AIR CIRCUIT:
- Consequences:
•swarf or metal objects in the turbocharger inlet and
outlet pipes,
•oil in the air circuit (collected in the intercooler).
- Risks (after replacing the turbocharger):
•metal objects sucked in by the compressor wheel
(destruction of the turbocharger).
FOR THE LUBRICATION CIRCUIT:
- Consequences:
•swarf found 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).
INSTRUCTIONS:
- Drain the engine oil (see 10A, Engine and cylinder
block assembly, Engine oil: Draining - Refilling,
page 10A-40)
- Replace the oil filter (see 10A, Engine and cylinder
block assembly, Oil filter: Removal - Refitting,
page 10A-48) .
- Replace the seals and fittings,
- Carry out the following only if the compressor wheel is
broken or rubbing against the turbocharger casing:
•Drain the intercooler,
WARNING
The turbocharger pressure regulator rod must not
be adjusted.
112666
(1) Air filter unit
(2) Air flowmeter
(3) Compressor wheel
(4) Intercooler
(5) Inlet manifold
(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
WARNING
Metal objects may enter the oil and air circuits as a
result of a broken turbocharger.
Failure to follow the INSTRUCTIONS listed will lead
to the turbocharger breaking again.