Dayco Automatic Belt Tensioner for BMW 530D 535D 730D X3 X5 X6

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 > 530D > Jul 2009 - , 3.0L, 6 cyl, 24V, DOHC, CRD, Turbo, Diesel, F10, 180kW, EngCode: N57D30

BMW > 530D > Feb 2010 - , 3.0L, 6 cyl, 24V, DOHC, CRD, Turbo, Diesel, F07, 180kW, EngCode: N57D30

BMW > 535D > Oct 2010 - , 3.0L, 6 cyl, 24V, DOHC, CRD, Twin Turbo, Diesel, F10, 220kW, EngCode: N57D30B

BMW > 730D > May 2009 - Sep 2012, 3.0L, 6 cyl, 24V, DOHC, CRD, Turbo, Diesel, F01, 180kW, EngCode: N57D30

BMW > 730D > Oct 2012 - Oct 2015, 3.0L, 6 cyl, 24V, DOHC, CRD, Turbo, Diesel, F01, 190kW, EngCode: N57D30

BMW > X3 > Dec 2007 - Feb 2011, 2.0L, 4 cyl, 16V, DOHC, CRD, Turbo, Diesel, E83, 130kW, EngCode: N47D20

BMW > X5 > Jun 2010 - Sep 2013, 3.0L, 6 cyl, 24V, DOHC, CRD, Twin Turbo, Diesel, E70 xDrive 40d, 225kW, EngCode: N57D30B

BMW > X5 > Jun 2010 - Sep 2013, 3.0L, 6 cyl, 24V, DOHC, CRD, Turbo, Diesel, E70 xDrive 30d, 180kW, EngCode: N57D30A

BMW > X5 > Jun 2012 - Sep 2013, 3.0L, 6 cyl, 24V, DOHC, CRD, Triple Turbo, Diesel, E70 M50d, 280kW, EngCode: N57D30C

BMW > X6 > Sep 2010 - Dec 2014, 3.0L, 6 cyl, 24V, DOHC, CRD, Twin Turbo, Diesel, E71 40d, 225kW, EngCode: N57D30B

BMW > X6 > Jun 2011 - Dec 2014, 3.0L, 6 cyl, 24V, DOHC, CRD, Turbo, Diesel, E71 30d, 180kW, EngCode: N57D30A