This little guy’s job is pretty simple, but absolutely vital. It securely fastens the connecting rod to the piston. Think of the connecting rod as the arm that links the piston moving up and down to the crankshaft that actually spins and powers the wheels. This screw is one of the things holding that arm on tight. It needs to withstand a lot of force and stress from those moving parts. It’s a core component in the engine's bottom end. Without it, you’ve got no reliable connection between the piston and the crankshaft. Basically, your engine won’t run. It’s a pretty fundamental piece—it helps convert the up and down motion of the pistons into the rotational power that gets your car moving. It's important because if this screw fails, you’re looking at major engine damage. It acts like a shield protecting everything else. If it lets go, the connecting rod can come loose, banging around inside the engine. That can knock a hole in the engine block, ruin the crankshaft, and just create a whole lot of mess. You’ll notice if one of these is going bad – usually with a really loud knocking sound coming from the engine. It's definitely one of those parts you don’t want to gamble with. You can find these, and a lot of other engine parts, over at Fixparts Online if you need one. It’s always best to replace these when you’re doing other engine work to avoid bigger issues down the road. Shop with confidence: Screw (MPN A3550380371) comes with 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. Mercedes-Benz Trucks – trusted quality, available at FixParts Online!