Dayco Automatic Belt Tensioner Mercedes C230 C250 C280 C300 C350 CLK280 CLK350

Dayco No Slack Automatic Belt Tensioner

Designed to maintain constant tension on serpentine belt drives
Serpentine belt drives consist of a single belt that powers most, if not all, of the engine’s accessories.

To maintain the proper tension throughout the drive, an automatic, spring-loaded tensioner is incorporated into the drive system geometry.

Dayco’s Automatic Belt Tensioner features a patented “flat spring” design that’s engineered to provide less operating range variations in tension.

This reduces the risk of premature accessory bearing failure due to high tension when a new belt is installed.

It also lessens the risk of belt squeal and slippage, or poor accessory performance caused by low tension after the belt begins to stretch and wear. A Teflon strip wound within the spring resists abrasion.

The flat spring itself is coated to resist rust.

Other superior design features include a steel locator pin (where the application demands).

A heavy-duty cast aluminium spring case resists cracking and fatigue. The heavy-duty cast aluminium arm offers additional strength and less distortion.

An aluminium retainer ring locks the spring case and arm together, and seals against corrosion.

A steel pivot tube (where the application demands) provides additional strength for critical torque requirements.

A thermoplastic rubber “spring slot plug” keeps out harmful contaminants. The lubricated nylon “pivot tube bushing” and “spring bushing” promote quieter performance.

A rubber “O” ring seals against dust and grime.

The zinc coated mounting bolt resists rust, and is concentric for a more even degree of constant tension.

In order to meet OEM performance standards, Dayco Automatic Tensioners come with either a glass-filled polymer (plastic) or steel pulley, that features a dust cover to protect against contaminants.

Fits the following Make, Model, Series:

Mercedes Benz > C230 > Sep 2005 - Jan 2008, 2.5L, V6, 24V, DOHC, MPFI, CL203, EngCode: M272.920

Mercedes Benz > C230 > Sep 2005 - Jan 2008, 2.5L, V6, 24V, DOHC, MPFI, W203, EngCode: M272.920

Mercedes Benz > C250 > Jan 2007 - Jan 2014, 2.5L, V6, 24V, DOHC VVT, MPFI, W204, 150kW, EngCode: M272.921

Mercedes Benz > C280 > Jan 2005 - Aug 2007, 3.0L, V6, 24V, DOHC VVT, MPFI, W203, EngCode: M272.940

Mercedes Benz > C280 > Jul 2007 - Oct 2009, 3.0L, 6 cyl, 24V, DOHC, MPFI, W204, EngCode: M272.947

Mercedes Benz > C300 > Nov 2009 - May 2011, 3.0L, V6, 24V, DOHC, MPFI, W204, 170kW, EngCode: M272.947

Mercedes Benz > C300 > Jun 2011 - Jul 2014, 3.0L, V6, 24V, DOHC, MPFI, W204, 185kW, EngCode: M272.957

Mercedes Benz > C350 > Sep 2005 - Jun 2007, 3.5L, V6, 24V, DOHC VVT, MPFI, W203, EngCode: M272.960

Mercedes Benz > C350 > Jan 2007 - Jan 2014, 3.5L, V6, 24V, DOHC VVT, MPFI, W204, EngCode: M272.961

Mercedes Benz > CLK280 > Sep 2005 - Jun 2010, 3.0L, V6, 24V, SOHC, MPFI, C209, EngCode: M272.940

Mercedes Benz > CLK350 > Sep 2005 - Feb 2010, 3.5L, V6, 24V, DOHC, MPFI, C209, 200kW, EngCode: M272.960

Mercedes Benz > CLS350 > Jun 2005 - , 3.5L, V6, 24V, DOHC, MPFI, C219, EngCode: M272.964

Mercedes Benz > E280 > Sep 2005 - Sep 2009, 3.0L, V6, 24V, DOHC, MPFI, W211, EngCode: M272.943

Mercedes Benz > E350 > Mar 2005 - Sep 2009, 3.5L, V6, 24V, DOHC, MPFI, W211, 200kW, EngCode: M272.964

Mercedes Benz > E350 > Jan 2009 - Aug 2011, 3.5L, V6, 24V, DOHC, MPFI, W212, 200kW, EngCode: M272.983

Mercedes Benz > E350 > Jul 2009 - Feb 2011, 3.5L, V6, 24V, DOHC, MPFI, C207, 200kW, EngCode: M272.961

Mercedes Benz > E350 > Apr 2010 - Feb 2011, 3.5L, V6, 24V, DOHC, MPFI, A207, 200kW, EngCode: M272.988

Mercedes Benz > G500 > Jun 2013 - , 5.5L, V8, 32V, DOHC, MPFI, W463, 285kW, EngCode: M273.963

Mercedes Benz > GL500 > Nov 2006 - Apr 2013, 5.5L, V8, 32V, DOHC, MPFI, X164, 285kW, EngCode: M273.963

Mercedes Benz > ML350 > Feb 2005 - Dec 2011, 3.5L, V6, 24V, DOHC, MPFI, W164, 200kW, EngCode: M272.967

Mercedes Benz > ML500 > Nov 2007 - Mar 2012, 5.5L, V8, 32V, DOHC, MPFI, W164, 285kW, EngCode: M273.963

Mercedes Benz > R350 > Sep 2005 - Jun 2010, 3.5L, V6, 24V, DOHC, MPFI, W251, EngCode: M272.967

Mercedes Benz > R500 > Oct 2007 - Jun 2010, 5.5L, V8, 32V, DOHC, MPFI, W251, 285kW, EngCode: M273.963

Mercedes Benz > S350 > Mar 2006 - Jan 2011, 3.5L, V6, 24V, DOHC, MPFI, W221, 200kW, EngCode: M272.965

Mercedes Benz > S450 > 2005 - 2007, 5.6L, V8, 32V, DOHC VVT, MPFI, W221, 250kW, EngCode: M273.922

Mercedes Benz > S500 > Feb 2006 - Jan 2011, 5.5L, V8, 32V, DOHC, MPFI, W221, 285kW, EngCode: M273.961

Mercedes Benz > S500L > Feb 2006 - Jan 2011, 5.5L, V8, 32V, DOHC, MPFI, W221, 285kW, EngCode: M273.961

Mercedes Benz > SL350 > May 2006 - May 2008, 3.5L, V6, 24V, DOHC, MPFI, R230, 200kW, EngCode: M272.966

Mercedes Benz > SL500 > May 2006 - Jul 2012, 5.5L, V8, 32V, DOHC, MPFI, R230, 285kW, EngCode: M273.965

Mercedes Benz > SLK280 > Aug 2005 - May 2008, 3.0L, V6, 24V, DOHC VVT, MPFI, R171, 170kW, EngCode: M272.942

Mercedes Benz > SLK300 > Mar 2010 - Jun 2011, 3.0L, V6, 24V, DOHC, MPFI, R171, 170kW, EngCode: M272.942

Mercedes Benz > SLK350 > Jun 2008 - Jun 2011, 3.5L, V6, 24V, DOHC, MPFI, R171, 224kW, EngCode: M272.969