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55K AMG 3-Piece Idler Pulley Set for Mercedes E55, S55, SL55, CL55, CLS55, G55 (M113K)

55K AMG 3-Piece Idler Pulley Set for Mercedes E55, S55, SL55, CL55, CLS55, G55 (M113K)

$375.00 USD
$375.00 USD
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M113K Kompressor • Reliability Upgrade

55K AMG 3-Piece Idler Pulley Set for Mercedes M113K (E55 / SL55 / S55 / CL55 / CLS55 / G55)

Replace failure-prone factory plastic pulleys with a billet aluminum pulley set built for supercharged load. Smooth, quiet operation with high-speed bearings — ideal for stock cars and pulley-upgraded setups.

✅ Billet Aluminum
Stronger than OEM plastic pulleys
✅ High-Speed Bearings
ZZ-rated Nachi bearings for durability
✅ Made in USA
Built to a higher standard

Why M113K Owners Replace the Factory Pulleys

The M113K Kompressor is legendary — but the factory idler pulleys are not. OEM pulleys are commonly plastic and can crack, wobble, or seize over time. That failure can cause belt slip, belt shredding, and unwanted stress on the belt drive system.

Most common symptoms:
  • Belt squeal / chirping at idle
  • Wobbling idler pulley or rough bearing noise
  • Belt dust around the front of the engine
  • Intermittent belt slip on hard pulls

This kit replaces the factory double-idler assembly and the tensioner pulley with billet aluminum components designed for long-term reliability.

What’s Included

  • 3-piece pulley set (idler pulleys + tensioner pulley replacement)
  • CNC-machined billet aluminum construction
  • ZZ-rated high-speed Nachi bearings for smooth, quiet operation
  • Designed as a direct-fit replacement for M113K belt drive pulleys

Benefits (Stock or Modified)

  • Eliminates a common M113K failure point
  • Improves belt tracking and long-term durability
  • Quiet, stable operation under supercharger load
  • Perfect companion upgrade for supercharger pulley or crank pulley setups

Note: This is a reliability upgrade. Power gains come from pulley/tune changes — this kit supports those mods safely.

Fitment (M113K Kompressor)

Fits Mercedes-Benz vehicles equipped with the M113K supercharged V8, including:

  • E55 AMG
  • SL55 AMG
  • S55 AMG
  • CL55 AMG
  • CLS55 AMG
  • G55 AMG

If your car is M113K (Kompressor), this is the correct belt-drive pulley upgrade. If you’re unsure, send your VIN.

Installation Notes

  • Designed for a straightforward replacement of the factory pulleys
  • Inspect belt condition during install (replace if cracked/glazed)
  • Professional installation recommended if you’re not familiar with belt drive work

FAQ (M113K)

Do M113K idler pulleys fail often?

Yes — the factory pulleys are commonly plastic and can crack or develop bearing noise with age, heat cycles, and supercharger load.

Should I replace pulleys when upgrading my supercharger or crank pulley?

Strongly recommended. Increased belt load can accelerate wear in old pulleys. Upgrading to billet pulleys improves reliability.

Will this kit add horsepower?

This is a reliability upgrade. It reduces risk of belt failure and supports performance mods — horsepower gains come from pulley/tune changes.

Built for M113K owners who want dependable belt drive reliability — on stock setups and pulley-upgraded builds.

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