Dayco Automatic Belt Tensioner BMW 335i 435i 535i 640i 740i 740Li M135i M2 M235i

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 > 335i > Feb 2012 - , 3.0L, 6 cyl, 24V, DOHC, TMPFI, Turbo, F30, 225kW, EngCode: N55B30A

BMW > 335i > Dec 2012 - , 3.0L, 6 cyl, 24V, DOHC, TMPFI, Turbo, F30 HYBRID, 225kW, EngCode: N55B30A

BMW > 335i > 2013 - , 3.0L, 6 cyl, 24V, DOHC VVT, Direct Inj., Turbo, F34, 225kW, EngCode: N55B30A

BMW > 435i > Oct 2013 - , 3.0L, 6 cyl, 24V, DOHC, TMPFI, Turbo, F32, 225kW, EngCode: N55B30A

BMW > 435i > Jan 2014 - , 3.0L, 6 cyl, 24V, DOHC VVT, TMPFI, Turbo, F33, 225kW, EngCode: N55B30A

BMW > 435i > May 2014 - May 2016, 3.0L, 6 cyl, 24V, DOHC VVT, Direct Inj., Turbo, F36, 225kW, EngCode: N55B30A

BMW > 535i > Feb 2010 - Mar 2017, 3.0L, 6 cyl, 24V, DOHC VVT, Direct Inj., Turbo, F07, 225kW, EngCode: N55B30

BMW > 535i > Jun 2010 - Mar 2017, 3.0L, 6 cyl, 24V, DOHC VVT, TMPFI, Turbo, F10, 225kW, EngCode: N55B30

BMW > 535i > Sep 2010 - Aug 2013, 3.0L, 6 cyl, 24V, DOHC VVT, TMPFI, Turbo, F11, 225kW, EngCode: N55B30A

BMW > 535i > Sep 2013 - Mar 2017, 3.0L, V6, 24V, DOHC VVT, TMPFI, Turbo, F11, 225kW, EngCode: N55B30A

BMW > 640i > Aug 2011 - , 3.0L, V6, 24V, DOHC VVT, TMPFI, Twin Turbo, F12, 235kW, EngCode: N55B30

BMW > 640i > Apr 2012 - , 3.0L, V6, 24V, DOHC VVT, TMPFI, Twin Turbo, F13, 235kW, EngCode: N55B30

BMW > 640i > Jul 2012 - , 3.0L, V6, 24V, DOHC VVT, TMPFI, Twin Turbo, F06, 235kW, EngCode: N55B30

BMW > 740i > Oct 2012 - Oct 2015, 3.0L, 6 cyl, 24V, DOHC VVT, Direct Inj., Turbo, F01, 235kW, EngCode: N55B30A

BMW > 740Li > Oct 2012 - , 3.0L, 6 cyl, 24V, DOHC VVT, Direct Inj., Turbo, F02, 235kW, EngCode: N55B30A

BMW > M135i > Aug 2012 - May 2015, 3.0L, 6 cyl, 24V, DOHC VVT, TFSI, Turbo, F20, 235kW, EngCode: N55B30A

BMW > M135i > Jun 2015 - Jun 2016, 3.0L, 6 cyl, 24V, DOHC VVT, Direct Inj., Turbo, F20, 240kW, EngCode: N55B30A

BMW > M2 > Feb 2016 - Jul 2017, 3.0L, 6 cyl, 24V, DOHC VVT, Direct Inj., Turbo, F87, 272kW, EngCode: N55B30T

BMW > M2 > Jul 2018 - , 3.0L, 6 cyl, 24V, DOHC VVT, Direct Inj., I/C Twin Turbo, F87, 302kW, EngCode: S55B30A

BMW > M235i > Mar 2014 - , 3.0L, 6 cyl, 24V, DOHC VVT, TFSI, Turbo, F22, 240kW, EngCode: N55B30A

BMW > M235i > Feb 2015 - , 3.0L, 6 cyl, 24V, DOHC VVT, TFSI, Turbo, F23, 240kW, EngCode: N55B30A

BMW > M3 > Jun 2014 - , 3.0L, 6 cyl, 24V, DOHC VVT, TMPFI, F80, 317kW, EngCode: S55B30T

BMW > M4 > Jun 2014 - , 3.0L, 6 cyl, 24V, DOHC VVT, TMPFI, F82, 317KW, EngCode: S55B30T

BMW > M4 > Jun 2014 - , 3.0L, 6 cyl, 24V, DOHC VVT, TMPFI, F83, 317KW, EngCode: S55B30T

BMW > M4 > Jul 2016 - , 3.0L, 6 cyl, 24V, DOHC VVT, TMPFI, F83, 331KW, EngCode: S55B30A

BMW > X3 > Mar 2011 - , 3.0L, 6 cyl, 24V, DOHC, TFSI, Turbo, F25, 225kW, EngCode: N55B30M0, NZ

BMW > X4 > Jun 2014 - , 3.0L, 6 cyl, 24V, DOHC VVT, TMPFI, Turbo, F26 35i, 225kW, EngCode: N55B30M0

BMW > X5 > May 2010 - Sep 2013, 3.0L, 6 cyl, 24V, DOHC VVT, MPFI, E70 35i, 225kW, EngCode: N55B30A

BMW > X5 > Nov 2013 - Jan 2018, 3.0L, 6 cyl, 24V, DOHC VVT, MPFI, F15, 225kW, EngCode: N55B30A

BMW > X6 > Sep 2010 - Dec 2014, 3.0L, 6 cyl, 24V, DOHC, TMPFI, Turbo, E71 35i, 225kW, EngCode: N55B30

BMW > X6 > Sep 2010 - Dec 2014, 3.0L, 6 cyl, 24V, DOHC VVT, TMPFI, Turbo, E71 X35i, 225kW, EngCode: N55B30

BMW > X6 > Apr 2015 - , 3.0L, 6 cyl, 24V, DOHC VVT, TMPFI, Twin Turbo, F16 X35i, 225kW, EngCode: N55B30