Dayco Automatic Belt Tensioner BMW 125i 220i 228i 320i 328i 420i 428i 520i 528i

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 > Apr 2012 - Oct 2016, 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, Turbo, F20, 160kW, EngCode: N20B20A

BMW > 220i > Mar 2014 - Oct 2016, 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, I/C Turbo, F22, 135kW, EngCode: N20B20A

BMW > 220i > Feb 2015 - Oct 2016, 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, I/C Turbo, F23, 135kW, EngCode: N20B20A

BMW > 228i > Aug 2014 - , 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, I/C Turbo, F22, 180kW, EngCode: N20B20A

BMW > 228i > Feb 2015 - , 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, I/C Turbo, F23, 180kW, EngCode: N20B20A

BMW > 320i > Apr 2012 - Sep 2015, 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, Turbo, F30, 135kW, EngCode: N20B20B

BMW > 328i > Feb 2012 - , 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, Turbo, F30, 180kW, EngCode: N20B20A

BMW > 328i > Mar 2013 - , 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, Turbo, F31, 180kW, EngCode: N20B20B

BMW > 328i > May 2013 - Jan 2017, 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, Turbo, F34, 180kW, EngCode: N20B20A

BMW > 420i > Jan 2014 - May 2016, 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, I/C Turbo, F32, 135kW, EngCode: N20B20B

BMW > 420i > May 2014 - Jan 2018, 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, I/C Turbo, F36, 135kW, EngCode: N20B20B

BMW > 420i > Sep 2014 - May 2016, 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, I/C Turbo, F33, 135kW, EngCode: N20B20B

BMW > 428i > Oct 2013 - May 2016, 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, I/C Turbo, F32, 180kW, EngCode: N20B20A

BMW > 520i > Nov 2011 - Nov 2019, 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, Turbo, F10, 135kW, EngCode: N20B20B

BMW > 528i > Sep 2013 - Mar 2017, 2.0L, 6 cyl, 24V, DOHC VVT, Direct Inj, Turbo, F10, 180KW, EngCode: N20B20B

BMW > X1 > Sep 2012 - Sep 2015, 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, Turbo, E84 20i, 135kW, EngCode: N20B20A

BMW > X3 > Dec 2011 - Nov 2017, 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, Turbo, F25 20i, 135kW, EngCode: N20B20A

BMW > X4 > Jun 2014 - Apr 2018, 2.0L, 4 cyl, 16V, DOHC, Direct Inj, Turbo, F26 20i, 135kW, EngCode: N20B20A

BMW > Z4 > Oct 2011 - Jan 2019, 2.0L, 4 cyl, 16V, DOHC VVT, Direct Inj, Turbo, E89, 135kW, EngCode: N20B20