BMW E60 glow plug replacement and a seized glow plug
E60 530d glow plug replacement: how do you get access?
The engine covers and the intake manifold are removed, which gives access to the glow plugs. Since the intake manifold is off anyway, it is worth replacing all the glow plugs at once. Disconnecting the water hose makes the work easier if the connections are tight.
How do you remove a seized glow plug without breaking it?
Spray solvent, for example penetrating oil, on the threads and let it soak for about 10 minutes. Keep the wrench torque at about two thirds of the breaking torque; the breaking torque of a 9 mm glow plug has been stated as 22 Nm. If the glow plug breaks off in the head, let a workshop remove it with special tools. Removing the cylinder head is the last resort.
What should you note when installing the new glow plugs?
Ream the glow plug bore clean before installation and put a small amount of copper paste on the thread. The glow plugs of the E60 (M57N) differ from those of the E39, so check the fit for your car.