Dayco Automatic Belt Tensioner BMW 325D 330D 335D 520D 525D 530D 535D 730D 730LD

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 > 325D > 2008 - 2010, 3.0L, 6 cyl, 24V, DOHC, CRD, Turbo, Diesel, E90, 145kW, EngCode: M57D30, RWD

BMW > 330D > Mar 2005 - Jul 2008, 3.0L, 6 cyl, 24V, DOHC, CRD, Turbo, Diesel, E91, 170kW, EngCode: M57D30

BMW > 330D > 2006 - 2008, 3.0L, 6 cyl, 24V, DOHC, CRD, Turbo, Diesel, E90, 170kW, EngCode: M57D30

BMW > 335D > May 2005 - Jan 2010, 3.0L, 6 cyl, 24V, DOHC, CRD, Turbo, Diesel, E90, 210kW, EngCode: M57D30

BMW > 520D > Feb 2005 - Feb 2007, 2.0L, 4 cyl, 16V, DOHC, DTFI, Turbo, Diesel, E60, 120kW, EngCode: M47D20

BMW > 525D > Oct 2003 - Feb 2007, 3.0L, 6 cyl, 24V, DOHC, DTFI, Turbo, Diesel, E60, 130kW, EngCode: M57D25

BMW > 525D > Nov 2005 - Feb 2010, 3.0L, 6 cyl, 24V, DOHC, DTFI, Turbo, Diesel, E61, 145kW, EngCode: M57D25

BMW > 525D > May 2006 - Dec 2009, 3.0L, 6 cyl, 24V, DOHC, DTFI, Turbo, Diesel, E60, 145kW, EngCode: M57D30

BMW > 530D > Dec 2002 - Oct 2008, 3.0L, 6 cyl, 24V, DOHC, DTFI, Diesel, E60, 160kW, EngCode: M57TUD30

BMW > 530D > Dec 2003 - Jul 2005, 3.0L, 6 cyl, 24V, DOHC, DTFI, Diesel, E61, 160kW, EngCode: M57TUD30

BMW > 530D > Nov 2005 - Jan 2010, 3.0L, 6 cyl, 24V, DOHC, DTFI, Diesel, E61, 170kW, EngCode: M57D30

BMW > 530D > Nov 2008 - Jun 2010, 3.0L, 6 cyl, 24V, DOHC, DTFI, Diesel, E60, 170kW, EngCode: M57D30

BMW > 535D > 2004 - 2007, 3.0L, 6 cyl, 24V, DOHC, DTFI, Turbo, Diesel, E61, 200kW, EngCode: M57D30

BMW > 730D > Sep 2004 - Jul 2008, 3.0L, 6 cyl, 24V, DOHC, CRD, Turbo, Diesel, E65, 170kW, EngCode: M57D30

BMW > 730LD > Apr 2005 - Jul 2008, 3.0L, 6 cyl, 24V, DOHC, CRD, Twin Turbo, E66, 185kW, EngCode: M57TU2D30

BMW > X3 > 2003 - 2006, 2.0L, 4 cyl, 16V, DOHC, CRD, Turbo, Diesel, E83, 110kW, EngCode: M47TUD20

BMW > X3 > Nov 2005 - Feb 2011, 3.0L, 6 cyl, 24V, DOHC, DTFI, Turbo, Diesel, E83 30d, 160kW, EngCode: M57TUD30

BMW > X3 > 2006 - 2010, 3.0L, 6 cyl, 24V, DOHC, CRD, Twin Turbo, Diesel, E83, 210kW, EngCode: M57TU2D30, AWD

BMW > X3 > 2006 - 2011, 3.0L, 6 cyl, 24V, DOHC, CRD, Turbo, Diesel, E83, 160kW, EngCode: M57TUD30