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Replacing the Coolant Drain Plug Gasket

Model: BMW Serie 5 E39 - Years 1995-2003
Part: Engine

Changing a gasket is a straightforward task, but the challenge lies in accessing it. As shown in the images, start by removing the hose and the air filter cover. Disconnect the various sensor connectors. Now, move on to disconnect the connectors of the ignition coils. Note that on the driver’s side, the connector for the eighth cylinder is separate. Next, remove the nuts and disconnect the entire injector connector box on both sides. Once the wiring is removed, you can begin unscrewing the intake manifold. During this type of work, it is good practice to also replace the oil separator shown in the images. This is a good opportunity to check the injectors as well. At this point, you should remove the water pump, but to save time, you can take off the hoses and then proceed to remove the lower cover. Notice the coolant leak that accumulates in the corner, coming from the hole and exiting at the front of the engine. The gasket is actually a strip of black silicone that you can reproduce as a replacement for the original with specific products available on the market. Allow a few minutes to pass and reinstall the cover. Replace all hoses and reattach the pipes as shown in the images. Reinstall the intake manifold, the injector connector box, and all the other wiring you disassembled earlier. Now, all you need to do is add coolant and check for any leaks.

Updated on 12 February 2026 by ScegliAuto

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