Serpentine Belt Tensioner for Mercedes-Benz

Why You Need This Part

The belt tensioner ensures your engine’s serpentine belt stays tight and operates smoothly. This tensioner keeps vital components—like the alternator, air conditioning compressor, and power steering pump—working together seamlessly. Over time, tensioner springs may weaken, causing the belt to slip or squeal.

How It Works

The tensioner automatically maintains correct tension on your serpentine belt using a strong internal spring. It adjusts constantly as the belt stretches and contracts due to engine heat and movement, preventing slippage or excess wear.

What Happens If Broken

If a tensioner fails, the belt can loosen or snap, leading to loss of power steering, alternator charge, or air conditioning. This can leave you stranded or cause major engine damage if ignored. A worn tensioner might also cause loud squealing noises or erratic engine accessory performance.

Compatible Mercedes-Benz Models

• C 400 4Matic
• Cls 400 4Matic
• S 450 4-Matic
• E 300 Blue Efficiency
• E 400
• E 320 L
• E 400 4Matic
• S 450
• Cls 320
• E 350
• S 400
• Glk 350
• Gle 400 4Matic
• Amg C 43 4Matic
• E 450
• Slk 350
• Gl/Gls 450 4Matic
• Sl 400
• R 350 4Matic
• More models available...