Diesel engines rely on a glow plug in place of the ignition system in petrol driven cars. Diesel engines do no have spark plugs that ignite the fuel mixture. Therefore, the glow plugs are required in order to heat the coil and start the vehicle.
Before you start your glow plug replacement, you should take preventative measures by disconnecting the black battery terminal. This will reduce the chances of getting shorts or shocks. If you are replacing all your glow plugs do they one at a time.
Locate the cylinder head and find the glow plug. Detach the glow plug connector from the plug. Using a socket wrench you will remove the glow plug by loosening it a counter-clockwise direction and taking it out. Loosen it far enough that you can unscrew the rest of it by hand.
Wipe the housing area where the glow plug lives. This will give a clean connection for the new glow plug, when situated. You can use a reamer if needed. These are common tools used by mechanics when replacing glow plugs.
When you situate the new glow plug, turn it clockwise using your hands. Get it hand tight before you begin using the socket wrench and then tighten the glow plug correctly into place. It is always best to hand tighten it first because you get a feel of whether the thread is in correctly.
You will need to reattach the glow plug wiring connector and make sure everything is where it should be. Before you start your engine make certain that you wait until the coil light has reacted and the engine is ready.