These bolts clamp the cylinder head down onto the engine block, creating a really tight seal. They hold everything together, resisting the incredible forces from combustion inside the engine. They’re also designed to maintain the proper alignment between the head and the block. Think of the cylinder head as the lid on top of your engine. These bolts are what keep that lid sealed tight. Without them, you’d have exhaust gases leaking out, coolant leaking out, oil leaking out… it’d be a mess, and your engine wouldn’t run at all. They’re a critical part of the engine’s sealing system. Because of those combustion forces I mentioned, these bolts are under a ton of stress. They stretch and compress with every firing of the engine. That stretching is actually by design—it helps them maintain a consistent clamping force. But over time, they can fatigue and lose their strength. If they fail, you'll likely notice a loss of power, coolant leaks, or even a blown head gasket. Replacing them is often part of any major top – end engine work, and it's always best to do it proactively rather than wait for a failure. You can find a good selection of these, including different grades and sizes, over at Fixparts Online. It's really best to stick with the correct bolts for your engine—don’t just grab something that looks similar. Get more value: Screw (MPN A4039900501) is protected by a 12-month warranty!

Why Choose Mercedes-Benz Trucks?

• Keep your truck running its best with parts made specifically for it. That means a better fit and reliable performance. • Genuine Mercedes-Benz parts are built to last, helping you avoid costly repairs and downtime on the road. • We offer a wide range of parts, from routine maintenance items to complex engine components, all readily available. • Trust the quality and expertise of Mercedes-Benz – we stand behind every part we sell, ensuring peace of mind for you and your business. Drive with confidence – choose Mercedes-Benz Trucks parts at FixParts Online.