Dayco Automatic Belt Tensioner Mercedes X220d X250d Nissan Navara X-Trail

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:

Mercedes Benz > X220d > Dec 2017 - , 2.3L, 4 cyl, 16V, DOHC, CRD, I/C Turbo, Diesel, 470, 120kW, EngCode: YS23DDT

Mercedes Benz > X250d > Dec 2017 - , 2.3L, 4 cyl, 16V, DOHC, CRD, Twin Turbo, Diesel, 470, 140kW, EngCode: YS23DDTT

Nissan > Navara > May 2015 - , 2.3L, 4 cyl, 16V, DOHC, CRD, I/C Turbo, Diesel, D23, 120kW, EngCode: YS23DDT

Nissan > X-Trail > Jul 2008 - Feb 2014, 2.0L, 4 cyl, 16V, DOHC, CRD, Turbo, Diesel, T31, 127kW, EngCode: M9RD

Nissan > X-Trail > Jul 2008 - Feb 2014, 2.0L, 4 cyl, 16V, DOHC, CRD, Turbo, Diesel, T31, 110kW, EngCode: M9RC

Renault > Espace > 2006 - 2008, 2.0L, 4 cyl, 16V, DOHC, DTFI, Diesel, 112kW, EngCode: M9R.740/50

Renault > Koleos > Sep 2008 - Apr 2010, 2.0L, 4 cyl, 16V, DOHC, DTFI, Turbo, Diesel, H45, 127kW, EngCode: M9R.830

Renault > Koleos > Sep 2008 - Aug 2013, 2.0L, 4 cyl, 16V, DOHC, DTFI, Turbo, Diesel, H45, 110kW, EngCode: M9R.832

Renault > Koleos > Sep 2009 - Aug 2013, 2.0L, 4 cyl, 16V, DOHC, DTFI, Turbo, Diesel, H45, 110kW, EngCode: M9RD

Renault > Koleos > Sep 2013 - Aug 2016, 2.0L, 4 cyl, 16V, DOHC, DTFI, Turbo, Diesel, H45, 127kW, EngCode: M9R.830

Renault > Laguna > Jun 2008 - Jan 2011, 2.0L, 4 cyl, 16V, DOHC, DTFI, Turbo, Diesel, X91, 110kW, EngCode: M9R.800/9

Renault > Laguna > Jun 2008 - Jan 2011, 2.0L, 4 cyl, 16V, DOHC, DTFI, Turbo, Diesel, X91, 110kW, EngCode: M9R.816/20

Renault > Latitude > Apr 2011 - Jan 2014, 2.0L, 4 cyl, 16V, DOHC, CRD, Diesel, X43, 127kW, EngCode: M9R.817

Renault > Megane > Aug 2008 - Jul 2010, 2.0L, 4 cyl, 16V, DOHC, DTFI, Turbo, X84, 127kW, EngCode: M9R.724

Renault > Trafic > May 2007 - Mar 2015, 2.0L, 4 cyl, 16V, DOHC, DTFI, Turbo, X83, 85kW, EngCode: M9R.780/6