Renault technical note 3419A Turbocharger diagnosis

7/29/2019 Renault technical note 3419A Turbocharger diagnosis

1/15

TECHNICAL NOTE 3419A

XXXX

DIESEL INJECTION

TURBOCHARGER

FAULT FINDING ASSISTANCE

This Technical Note deals with all turbocharged diesel injection engines

77 11 295 742

The repair methods given by the manufacturer in this document are based on thetechnical specifications current when it was prepared.

The methods may be modified as a result of changes introduced by the manufacturerin the production of the various component units and accessories from which hisvehicles are constructed.

APRIL 2000

All copyrights reserved by Renault.

EDITION ANGLAISE

Reproduction or translation, in part or in full, of this document or use of the service partreference numbering system is forbidden without the prior written authority of Renault.

RENAULT 2000


2/15

DIESEL INJECTION

Fault finding - Introduction 13113DIESEL INJECTION

Fault finding - Introduction

NOTES

Carry out a conformity check on the injection system, engine management system and engine using the fault finding

tool (see relevant fault finding sheets).

NOTE: the turbocharger is very rarely the source of a lack of engine performance.

13-1


3/15

DIESEL INJECTION

Turbocharger fault finding assistance 13Turbocharger fault finding assistanceThe engine lacks power despite normal consumption and exhaust emissions (turbo)

Problem on the accelerator control.

Check that the stop position is obtained

with full pedal depression (problem withthe thickness of the carpet/mat) and

adjust the accelerator cable. Does the

fault persist after this operation?

no End

yes

Check the condition of the air filter and

replace if necessary. Does the problem

persist after this operation?

noEnd

yes

Incorrect sealing of the inlet circuit.

Check the air filter and the air/air

exchanger pipes. Does the fault persist

after this check?

Check the turbocharging pressure. Is the

pressure correct?

nono

yes

End

yes

Faulty turbocharger. Replace theturbocharger: no operation is possible on

the turbocharger or the load regulator(except T2). Does the fault persist after

replacement?

Pipe between the manifold and the flow

corrector disconnected. Does the fault

persist after refitting?

yesno

yes noEnd

End

Venting pipe under the flow corrector

diaphragm blocked. Does the fault

persist after repair?

noEnd

yes

Faulty supply circuit. Check the supply and return pipes,

conformity of the filler cap, venting and cored screws on the pump.

Does the fault persist after checking/replacing?

noEnd

yes

13-2

A


4/15

DIESEL INJECTION

Turbocharger fault finding assistance 13

13-3

The engine lacks power despite normal consumption

and exhaust emissions (turbo) (continued)

Perform a test without filler cap. Does

the fault persist?

no

yesFit an approved cap.

Does the fault persist after this operation?

noEnd

Check the loss of pressure in the circuit.

Measure the value of the vacuum

pressure at the filter outlet on the pump

side.

Is the vacuum pressure > 0.2 bar?

yes

yesno

Measure the value of the vacuum

pressure at the filter inlet.

Is the value > 0.1 bar?

no Check the upstream circuit.

Does the fault persist after this operation?no

yes yes End

Change the fuel filter. Fit only an

original cartridge.

Does the fault persistafter replacement?

yes Check the circuits.

Does the fault persist?

no no

Endyes

End

Discharge pipes crushed at the

connections.

Check the condition of the internal

diameter of the tubes. Replace the faultyparts. Does the problem persist?

noEnd

yes

Check the injection pump and distribution

timing. Does the fault persist afterchecking/adjusting?

noEnd

yes

The injection pump is incorrectly adjusted.

Send it to a Renault Injection Centre.

A


5/15

DIESEL INJECTION


13-4

The engine lacks power and there is abnormal consumption and exhaust emissions (turbo)

Check the condition of the air filter and

replace if necessary. Does the problem

persist after this operation?

noEnd

yes

Change the fuel filter. Fit only an

original cartridge.

Does the fault persist

after replacement?

noEnd

yes

Check the conformity and condition of

the injectors (calibration/atomisation...).

Does the fault persist after checking and

possible replacement?

noEnd

yes

Incorrect sealing of the inlet circuit.

Check the air filter and the air/air

exchanger pipes.

Does the fault persist after this check?

Check the turbocharging pressure.

Is the pressure correct?

nono

yes

End

yes

Faulty turbocharger. Replace the

turbocharger: no operation is possible on

the turbocharger or the load regulator

(except T2). Does the fault persist after

replacement?

Pipe between the manifold and the flow

corrector disconnected. Does the fault

persist after refitting?

yesno

yes no End

End

Venting pipe under the flow manifold

diaphragm blocked. Does the fault

persist after repair?

noEnd

yes

A


6/15

DIESEL INJECTION


13-5

The engine lacks power and there is abnormal consumption and exhaust emissions (turbo) (continued)

Valves adjusted incorrectly. Check and

adjust the valve clearances. Does the

fault persist after this operation?

noEnd

yes

Incorrect timing adjustment. Check the

timing adjustment. Does the fault persist

after this operation?

noEnd

yes

Check the injection pump timing.

Does the fault persist after this

operation?

noEnd

yes

Insufficient engine compression.

Check the engine compression. Is itgreater than 25 bar?

no

yes

Retune the engine.



no

Partially clogged exhaust. Check the

exhaust circuit. Does the fault persist


yesEnd

yes no

End

Engine operating temperature too low.

Check the cooling circuit (thermostat).

Does the fault persist after checking/

replacing?

yes The injection pump is incorrectly adjusted.

Send it to a Renault Injection Centre.

noEnd

A


7/15

DIESEL INJECTION


13-6

The engine emits blue exhaust fumes

Engine running

(when cold)

Are there blue exhaust fumes at idle

speed and with unladen acceleration

(engine cold)?

Engine running(when hot)

Are there blue exhaust fumes at idle

speed and with unladen acceleration

(engine hot)?

noThe turbocharger is not the fault.

Perform fault finding on the other engine

functions (pre-postheating, injection...)

yes

Engine stationary.

Is the engine oil level greater than the

maximum?

yesCorrect the oil level

no

Does the engine consume too much oil

(according to manufacturer'sprocedure)?

no

The turbocharger is not the fault.

Perform fault finding on the other enginefunctions.

yes

Is the air filter clogged?yes Replace the filter element or clean the air

filter.

no

A


8/15

DIESEL INJECTION


13-7

The engine emits blue exhaust fumes (continued)

Check the air supply circuit from the air

filter to the turbocharger and from theturbocharger to the engine (tightness,

conformity...)

Engine running

Is the air inlet circuit between the

turbocharger and the engine tight?

no Replace the faulty parts or eliminate

the leak

yes

Are the air ducts deformed or pinched,

are they deformed or pinched with

unladen acceleration?

yes Replace the air ducts

concerned

no (*)

Note: It is normal to find traces of oil

at the turbocharger inlet and outlet,

as the air entering the compressor

contains oil from the engine

rebreathing circuit

Engine stationary.

Is the air duct between the turbocharger

and the exchanger (or between the

turbocharger and the engine, if there is

no exchanger) abnormally greasy (*) ?

no

yes

Is the air duct from the air filter greasy atthe turbocharger inlet?

yes

Check the crankcase gas recirculation

system (oil decanter, crankcase vent, ...)and the gas pressure in the cylinder

block.

no

Is the oil return pipe from the

turbocharger blocked, deformed or

pinched?

yes Replace the turbocharger oil return

pipe

no

Remove the turbocharger

A

B


9/15

DIESEL INJECTION


13-8

The engine emits blue exhaust fumes (continued)


Are there traces of oil in the engine

exhaust manifold and in the

turbocharger inlet pipe (exhaust gas

inlet to the turbocharger)?

yes

The turbocharger is not the fault. The oil

is coming from the engine. Check the

engine (piston segmentation, valve rod,

gas pressure in the cylinder block, ...)

no

Are there traces of oil at the

turbocharger outlet, on the exhaustpipe side (exhaust bend inlet or

exhaust pipe inlet)

no

The turbocharger is not the fault. Check

the engine (piston segmentation, valverods, gas pressure in the cylinder

block, ...) and the injection equipment

yes

Is the oil return pipe from the

turbocharger blocked or pinched?

yesCorrect to default

no

Replace the turbocharger

B


10/15

DIESEL INJECTION


13-9

The engine produces black exhaust fumes

Engine stationary.


filter.

no

Check:

the air supply circuit from the air filter

to the turbocharger and from the

turbocharger to the engine (tighness,

conformity...)

the connection and tightness of the

connections on the flow corrector

control circuit (injection pump).

Engine running and vehicle stationary

Do the air ducts deform or pinch with


yesReplace the air ducts concerned

no

Engine running and vehicle moving

Is the turbocharging pressure under load

correct?

yesCheck the other components: injection

system, diesel supply circuit, engine,

exchanger (clogging)

no

A


11/15

DIESEL INJECTION


13-10

The engine produces black exhaust fumes (continued)

Engine running

vehicle stationary



no Replace the faulty parts or eliminate the

leak

yes

Is there an exhaust gas leak between the

engine and the turbocharger (engine

outlet, exhaust manifold, turbine inlet)?

yesEliminate the leak

no

Is the vehicle exhaust system after the

turbocharger blocked or partially

blocked?

yesReplace any faulty parts.

no

Engine stationary.

Are the valve clearances and

compression correct?

Is the timing adjusted correctly?

noCorrect to default

yes

A

B


12/15

DIESEL INJECTION


13-11

The engine produces black exhaust fumes (continued)

Is the injection system correct?

Are the connections correct (diesel

circuit, flow corrector)?

Are the adjustments correct (static

adjustment, flow and flow corrector

adjustment, advance adjustment)?

noCorrect to default

yes



B


13/15

DIESEL INJECTION


13-12

Noise or whistling

Engine running

(when cold)

Drive with the vehicle in 2nd and 3rd

gear at an engine speed of 1700

to 3500 rpm.

Is there a noise from the turbocharger

(whistling), which varies with the engine

speed when accelerating

(engine cold)?

Engine running

(when hot)

Drive with the vehicle in 2nd and 3rd

gear at an engine speed of 1700to 3500 rpm.

Is there a noise from the turbocharger

(whistling), which varies with the engine

speed when accelerating

(engine warm)?

noThe turbocharger is not the fault.

yes




leak

yes

Is the air inlet circuit between the air filter

and the turbocharger tight?


leak

yes

A


14/15

DIESEL INJECTION


13-13

Noise and whistling (continued)

Are the air ducts deformed or pinched,

are they deformed or pinched with


yesReplace the air ducts concerned

no

Engine stationary.


filter.

no

Is the exhaust pipe correct?no

Correct it to return it to conformity

yes

Engine running

Is there an exhaust gas leak

between the engine and the

turbocharger (engine outlet, exhaust

manifold, turbine inlet)?


no

Is there an exhaust gas leak in the

vehicle exhaust system after the

turbocharger?


no



A


15/15

DIESEL INJECTION

Turbocharger fault finding assistance 13Air breathing (turbocharger)

Leak in the turbocharging air circuit.

Check the tightening of the air/airexchanger pipes and the exhaust and

inlet manifolds. Does the fault persist


noEnd

yes

Leak in injector seals.

Replace any faulty seals.


after replacement?

noEnd

yes

Leak in a preheating plug. Tighten the

plug correctly or replace it if necessary.

Does the fault persist after this

operation?

noEnd

yes

Leak in cylinder head gasket.

Replace the cylinder head gasket and

check the mating surfaces.

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Renault technical note 3419A Turbocharger diagnosis

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