These screws basically hold the cylinder head down onto the engine block. They’re high – strength bolts, designed to withstand a lot of pressure and heat from combustion. They’re responsible for sealing everything tightly together, keeping compression inside the cylinder where it belongs. It's a pretty straightforward function, but incredibly vital. These are core to how your engine functions. They’re part of what keeps everything sealed up in the top end of the engine. Think of them as vital clamps holding the whole thing together. Without properly tightened cylinder screws, you’re going to lose compression, and that means a loss of power, rough running, and potentially some serious engine damage. They’re really a fundamental piece of the engine’s structure. These aren't something you want to put off fixing. If one of these screws starts to fail—maybe it stretches, cracks, or the threads get damaged—you’ll notice if it’s a minor issue with a loss of power, or it could escalate to a major issue like coolant leaking into the combustion chamber or even catastrophic engine failure. They act like a shield, protecting the critical internal components. A failing screw compromises that protection. You can find replacements pretty easily, a place like Fixparts Online carries a good range of these, but it’s worth getting the right ones and making sure they're torqued to spec when you install them. Ignoring a problem here can turn a small repair into a very large and expensive one. Customer-approved reliability: Cylinder Screw (MPN A0039907405) includes a 12-month warranty!

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• Keep your truck running its best with parts made specifically for Mercedes-Benz. They fit right and work like they should. • Genuine Mercedes-Benz parts are built to last, saving you money on repairs down the road. • We have a wide selection of parts available, so you can get what you need quickly. • Trust the quality and reliability that Mercedes-Benz is known for – protect your investment with genuine parts. Performance you can rely on – Mercedes-Benz Trucks parts from FixParts Online.