Changement de turbo sur Citroën C4 I - 1.6HDi 90

The 1.6 HDI engine is very sensitive to oil quality and turbo failure can be due to a lack of oil or oil with too many particles.

Vidange moteur et filtre à huile sur Citroën C4

Do a first oil change with a low-end oil such as 15W40 to "clean the engine"

Let the engine idle for 15 minutes so that the new filter removes as many particles as possible.

Do a second oil change with normal oil

This time the gauge should come out with very clear oil and not black oil.

Unscrew the right screw

Unscrew the fixing collar

Unscrew the hose and conduit fixing clamp

Disconnect the radiator hose from the duct

Rotate the conduit and unclip it from the plastic stud located behind

Take out the conduit

Store the 2 screws and the conduit so as not to lose anything

Loosen the 2 metal collars

Take out the conduit

Tidy up the duct so you don't lose anything

Unscrew the 7 fixing screws

Be careful not to damage the engine radiator during removal.

Lower and pivot the heat shield rearward to remove it from the engine compartment

Store the protection and the 7 screws

Remove the plastic pad

Unscrew the 2 fasteners

Store the protection and the 2 screws + the stud

Spray rusty fasteners with penetrating oil to make disassembly easier.

on the exhaust collar at the turbo outlet

On the 4 nuts of the exhaust pipe

on the exhaust collar at the catalyst outlet

Unscrew the clamping screw of the collars

Spread the collar with a screw and 2 nuts (tightening the 2 nuts spreads the collar)

Shift it to the left to release the catalyst

Do the same under the engine between the catalyst and the exhaust line

Unscrew the 2 nuts securing the catalyst

Remove the catalyst from below

Store the catalyst, clamps and fixing nuts + the support

Remove and store the thermal protection

Remove the 6-sided screw from the oil inlet at the engine outlet

Loosen the oil return hose clamp

Remove the 6-sided oil inlet screw on the turbo

Remove and store the hose and screw plus the clamp

Disconnect the vacuum hose

Loosen the 4 nuts securing the turbo to the exhaust pipe

Remove the turbo from the engine

Check the parts to be removed from the old turbo to install on the new one

oil hose

the studs

the torx screw

comparison of the 2 turbos (size, connections, etc.)

Oil precharge with a syringe

Reassembly of hose, torx screws and studs

Secure the turbo with the 4 nuts

Reconnect the vacuum hose

Remove the lapping filter on the lower hollow screw

Connect and tighten the oil return hose clamp

Tighten the hollow oil return screw with a wrench to seat the fitting (approximately 7mm in diameter)

Tighten the hollow oil return screw with a socket to wedge the fitting (approximately 20mm in diameter)

The tube must be perfectly centered on the fitting from the bottom and from the top

Risk of oil leakage, and therefore turbo failure

if necessary, repeat the previous step

Reassemble the rear protection

Reassemble the binding

Reassemble the catalyst

fix the catalyst with the 2 nuts

fix the catalyst on the turbo and on the exhaust line with the 2 metal clamps

Reassemble the upper protection + the plastic pin

Reassemble the air outlet hose by rotating it

Tighten the screw and the 2 clamps

Reassemble the hose and tighten the 2 clamps

Reassemble the thermal protection and tighten the 7 screws

Disconnect the 4 injectors (to prevent the engine from starting and to begin lubricating the turbo)

Run the starter for 30 seconds to allow oil circulation to begin before the turbo spins

If the turbo is started without this step, it can lead to irreparable wear of the turbo.

Reconnect the injectors and start the car, let it idle for 10 min

Following the disconnection of the injectors there will be pollution alarms, after several starts they will disappear