Upgraded Supercharger Double Idler Pulley Set for Mercedes Benz E-Class CLS-Class CL-Class S-Class SL-Class G-Class E55 CLS55 CL55 S55 SL55 G55 (2003-2011) 5.5L
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Billet Aluminum Supercharger Double Idler Pulley Set for 2003-2011 Mercedes Benz E-Class, CLS-Class, CL-Class, S-Class, SL-Class, G-Class (W211, C219, C215, W220, R230, W463)
What it Does: The upgraded billet supercharger double idler pulley set replaces failure-prone factory plastic idlers on 2003-2011 Mercedes Benz 5.5L AMG platforms to prevent belt throw, bearing seizure, and supercharger drive slip.
The Stock Mercedes Benz M113K Idler Pulley Failure Point
The factory supercharger idler pulleys on the M113K engine utilize molded composite plastic shells that cannot withstand long-term rotational stress and engine bay heat soak. Under high RPM loads and elevated drive belt tension, these OEM plastic pulleys frequently deform, groove, or crack. Worse, the stock bearing assemblies are prone to seal degradation, causing lubricant blow-by, excessive runout, catastrophic bearing seizure, and shredded drive belts that leave vehicles stranded.
The Engineering Solution
Engineered from solid T6 aircraft-grade billet aluminum, this double idler set eliminates the thermal brittleness of the stock units. Each pulley is CNC-machined to precise tolerances and finished in a black hard-anodized coating that resists belt abrasion and chemical corrosion. High-grade dual-sealed Nachi bearings are integrated into each pulley body to sustain extreme rotational velocities and axial thrust without lubricant breakdown. The kit includes a custom tensioner pulley bearing shield to deflect road debris and radiant heat, ensuring sustained drive grip under peak supercharger load.
What's Included
- 2 x Billet supercharger double idler pulleys
- 1 x Custom tensioner pulley bearing shield
Technical Specifications
| Fitment | 2003-2011 Mercedes Benz E-Class, CLS-Class, CL-Class, S-Class, SL-Class, G-Class |
|---|---|
| Engine / Chassis | M113K 5.5L Supercharged V8 / W211, C219, C215, W220, R230, W463 |
| Stock Output | 469-510 hp / 516-531 lb-ft |
| Replaces OEM Part # | 1132020419, A1132020419 |
Compatibility
- 2003-2008 Mercedes Benz E-Class E55 AMG 5.5L
- 2003-2008 Mercedes Benz CLS-Class CLS55 AMG 5.5L
- 2003-2008 Mercedes Benz CL-Class CL55 AMG 5.5L
- 2003-2008 Mercedes Benz S-Class S55 AMG 5.5L
- 2003-2008 Mercedes Benz SL-Class SL55 AMG 5.5L
- 2005-2011 Mercedes Benz G-Class G55 AMG 5.5L
Frequently Asked Questions & Fitment Warnings
Does this fit naturally aspirated 5.5L or 5.0L Mercedes models?
No, this double idler set is exclusively designed for the supercharged M113K 5.5L V8 engine and will not fit naturally aspirated M113, M273, or later M157/M278 platforms.
Are modifications required to install this pulley set?
No modifications are required; this is a direct-fit bolt-on replacement for factory part numbers 1132020419 and A1132020419, though professional installation and torque verification are recommended.
The Mercedes Benz AMG Precision Standard
High-output European forced induction platforms require zero-tolerance accessory drive components. This billet aluminum idler setup restores engineered belt tracking and eliminates premature rotational failures, maintaining peak supercharger efficiency without vibration or fault codes.
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