Dayco Automatic Belt Tensioner BMW 125i 130i 323i 325i 523i 525i 528i 630i 730i

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:

BMW > 125i > May 2008 - Feb 2014, 3.0L, 6 cyl, 24V, V-DOHC, MPFI, E82, 160kW, EngCode: N52B30

BMW > 125i > May 2008 - Jan 2015, 3.0L, 6 cyl, 24V, V-DOHC, MPFI, E88, 160kW, EngCode: N52B30

BMW > 130i > Nov 2005 - Feb 2007, 3.0L, 6 cyl, 24V, V-DOHC, MPFI, E87, EngCode: N52B30

BMW > 323i > Apr 2005 - Mar 2007, 2.5L, 6 cyl, 24V, DOHC VVT, MPFI, E90, 130kW, EngCode: N52B25

BMW > 323i > Jun 2005 - Jan 2012, 2.5L, 6 cyl, 24V, DOHC VVT, MPFI, E90, 140kW, EngCode: N52B25

BMW > 323i > Jun 2006 - May 2007, 2.5L, 6 cyl, 24V, DOHC VVT, MPFI, E91, 130kW, EngCode: N52B25

BMW > 323i > Jan 2007 - Apr 2010, 2.5L, 6 cyl, 24V, V-DOHC, MPFI, E92, 140kW, EngCode: N52B25

BMW > 323i > Jun 2007 - Sep 2012, 2.5L, 6 cyl, 24V, DOHC VVT, MPFI, E91, 140kW, EngCode: N52B25

BMW > 325i > Jul 2004 - Aug 2007, 2.5L, 6 cyl, 24V, DOHC, MPFI, E90, 160kW, EngCode: N52B25

BMW > 325i > Oct 2006 - Aug 2007, 2.5L, 6 cyl, 24V, DOHC, MPFI, E92, 160kW, EngCode: N52B25O0

BMW > 325i > Sep 2006 - Aug 2008, 2.5L, 6 cyl, 24V, DOHC VVT, MPFI, E91, 160kW, EngCode: N52B25, NZ

BMW > 325i > Apr 2007 - Jan 2010, 2.5L, 6 cyl, 24V, DOHC, MPFI, E93, 160kW, EngCode: N52B25A

BMW > 325i > Sep 2007 - Jan 2012, 2.5L, 6 cyl, 24V, DOHC, MPFI, E90, 160kW, EngCode: N52B25A

BMW > 325i > Sep 2007 - Jan 2014, 2.5L, 6 cyl, 24V, DOHC, MPFI, E92, 160kW, EngCode: N52B25A

BMW > 325i > May 2010 - Jan 2014, 2.5L, 6 cyl, 24V, DOHC VVT, MPFI, E93, 160kW, EngCode: N52B25A

BMW > 523i > Nov 2004 - Feb 2007, 2.5L, 6 cyl, 24V, DOHC VVT, MPFI, E60, 130kW, EngCode: N52B25

BMW > 523i > Mar 2007 - Jun 2010, 2.5L, 6 cyl, 24V, DOHC, MPFI, E60, 140kW, EngCode: N52B25AF

BMW > 525i > Feb 2003 - Oct 2007, 2.5L, 6 cyl, 24V, DOHC, MPFI, E61, 160kW, EngCode: N52B25

BMW > 525i > Mar 2005 - Feb 2007, 2.5L, 6 cyl, 24V, DOHC, MPFI, E60, 160kW, EngCode: N52B25

BMW > 528i > Jun 2010 - Oct 2011, 3.0L, 6 cyl, 24V, DOHC VVT, MPFI, F10, 190kW, EngCode: N52B30

BMW > 630i > Feb 2004 - Jul 2007, 3.0L, 6 cyl, 24V, DOHC VVT, MPFI, E63, 190kW, EngCode: N52B30

BMW > 730i > Oct 2002 - Feb 2005, 3.0L, 6 cyl, 24V, DOHC, EFI, E65, 170kW, EngCode: M54B30

BMW > 730i > Sep 2004 - Jul 2008, 3.0L, 6 cyl, 24V, DOHC VVT, MPFI, E61, 190kW, EngCode: N52B30

BMW > X1 > Apr 2010 - Jan 2012, 3.0L, 6 cyl, 24V, DOHC, MPFI, E84 25i, 160kW, EngCode: N52B30

BMW > X3 > Dec 2006 - Feb 2011, 3.0L, 6 cyl, 24V, DOHC, MPFI, E83 30i, 200kW, EngCode: N52B30

BMW > X3 > Dec 2006 - Feb 2011, 2.5L, 6 cyl, 24V, DOHC, MPFI, E83 25i, 200kW, EngCode: N52B25

BMW > X5 > Mar 2007 - May 2010, 3.0L, 6 cyl, 24V, DOHC, MPFI, E70, 200kW, EngCode: N52B30

BMW > Z4 > Apr 2006 - Apr 2009, 2.5L, 6 cyl, 24V, DOHC, MPFI, E85, 160kW, EngCode: N52B25

BMW > Z4 > Oct 2007 - Aug 2011, 3.0L, 6 cyl, 24V, DOHC VVT, E85, E86, E89, 190kW/195kW, EngCode: N52B30

BMW > Z4 > May 2009 - Aug 2011, 2.5L, 6 cyl, 24V, DOHC, MPFI, E89, 150kW, EngCode: N52B25