Changing the glow plugs on Citroën C5 I 1.6HDi

To make loosening the spark plugs easier, it is best to bring the engine up to operating temperature.

Location of the hoses to be removed, remove the 10 screw.

Remove the hose that carries air to the air filter housing (clipped only)

Loosen the flow meter clamp

Unscrew the turbo hose clamp

Be careful with the breather clips; spread the 2 clips well when removing the turbo intake hose.

Turbo air intake hose, removed

Protect the turbo with a cloth

Remove the 3 screws with an 8 mm socket: (small tip when replacing this 3rd screw, put a piece of paper in the socket and fit the head of the screw forcefully into the socket then screw)

Remove the flow meter without disconnecting it, then place it to the side

Unscrew the 2 screws with a flat screwdriver , then remove the air filter cover. Finally, remove the air filter housing mounted on the silencer block

Remove the air filter cover + housing

Disassembly of the EGR valve pipe (located on the upper right side of the engine) by unscrewing the 2 torx screws (tx 30) and unclip the clamp located at the other end of the pipe

Please note that for reassembly you will need a new collar.

EGR valve tubing removed.

The glow plugs are behind the engine. To work properly, take an old blanket, put it on the engine and lie down on it; you will see the plugs better and it is much easier to loosen them, especially the nut that holds the power terminal.

Remove the 8 nut from each spark plug with an 8 socket, lift the spark plug power terminal. Then, with the long 8 socket, remove the 4 glow plugs. If you feel any hard spots, screw them back in and out as if you were rethreading them while cleaning them. Be careful, do not force them, otherwise you risk breaking the spark plug.

Compare old spark plugs with new ones

To reassemble the spark plugs, lubricate the threads with copper grease only. Once the 4 spark plugs are tightened, reassemble the power terminals

Reassemble in reverse order what was removed.