Dayco Automatic Belt Tensioner BMW 540i 545i 550i 645Ci 650i 735i 740i 745i

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 > 540i > Nov 2005 - Jun 2008, 4.0L, V8, 32V, DOHC, MPFI, E60, EngCode: N62B40A

BMW > 545i > Feb 2004 - Oct 2005, 4.4L, V8, 32V, DOHC, MPFI, E60, EngCode: N62B44

BMW > 550i > Apr 2005 - Feb 2007, 4.8L, V8, 32V, DOHC VVT, MPFI, E61, 270kW, EngCode: N62B48

BMW > 550i > Nov 2005 - Jun 2010, 4.8L, V8, 32V, DOHC VVT, MPFI, E60, 270kW, EngCode: N62B48

BMW > 645Ci > May 2004 - Oct 2005, 4.4L, V8, 32V, DOHC, MPFI, E63, 245kW, EngCode: N62B44

BMW > 645Ci > May 2004 - Oct 2005, 4.4L, V8, 32V, DOHC, MPFI, E64, 245kW, EngCode: N62B44

BMW > 650i > Nov 2005 - Jan 2008, 4.8L, V8, 32V, DOHC, MPFI, E63, 270kW, EngCode: N62B48

BMW > 650i > Nov 2005 - Jan 2008, 4.8L, V8, 32V, DOHC, MPFI, E64, 270kW, EngCode: N62B48

BMW > 650i > Jan 2008 - Apr 2011, 4.8L, V8, 32V, DOHC, MPFI, E64, 270kW, EngCode: N62B48

BMW > 650i > Jan 2008 - Mar 2012, 4.8L, V8, 32V, DOHC, MPFI, E63, 270kW, EngCode: N62B48

BMW > 735i > Jan 2002 - May 2005, 3.6L, V8, 32V, DOHC, MPFI, E65, 200kW, EngCode: N62B36

BMW > 740i > Jun 2005 - Feb 2009, 4.0L, V8, 32V, DOHC, MPFI, E65, 225kW, EngCode: N62B40

BMW > 740i > Jun 2005 - Feb 2009, 4.0L, V8, 32V, DOHC, MPFI, E66, 225kW, EngCode: N62B40

BMW > 745i > Jan 2002 - May 2005, 4.4L, V8, 32V, DOHC, MPFI, E65, 245kW, EngCode: N62B44

BMW > 745Li > Aug 2002 - May 2005, 4.4L, V8, 32V, DOHC, MPFI, E66, 245kW, EngCode: N62B44

BMW > 750i > May 2005 - Feb 2009, 4.8L, V8, 32V, DOHC, MPFI, E65, 270kW, EngCode: N62B48

BMW > 750Li > Jun 2005 - Feb 2009, 4.8L, V8, 32V, DOHC, MPFI, E66, 220kW, EngCode: N62B48

BMW > 760Li > May 2003 - Feb 2009, 6.0L, V12, 24V, DOHC, MPFI, E66, 327kW, EngCode: N73B60

BMW > X5 > Jan 2004 - Feb 2007, 4.4L, V8, 32V, DOHC, MPFI, E53, 235kW, EngCode: N62B44

BMW > X5 > Mar 2007 - May 2010, 4.8L, V8, 32V, DOHC, MPFI, E70 xDrive 48i, 261kW, EngCode: N62B48