Dayco Automatic Belt Tensioner BMW 535i 540i 740i 740iL M5 X5 Land Rover Range

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 > 535i > Oct 1996 - Oct 2003, 3.5L, V8, 32V, DOHC, MPFI, E39, EngCode: M62B35

BMW > 540i > Oct 1996 - Oct 2003, 4.4L, V8, 32V, DOHC, MPFI, E39, EngCode: M62B44

BMW > 740i > Sep 1995 - Aug 1998, 4.4L, V8, 32V, DOHC, MPFI, E38, 210kW, EngCode: M62B44

BMW > 740i > Feb 1998 - Jul 2001, 4.4L, V8, 32V, DOHC, MPFI, E38, 210kW, EngCode: M62TUB44

BMW > 740iL > Jul 1996 - Oct 1998, 4.4L, V8, 32V, DOHC, MPFI, E38, EngCode: M62B44

BMW > 740iL > Oct 1998 - Dec 2000, 4.4L, V8, 32V, DOHC, MPFI, E38, EngCode: M62TUB44

BMW > M5 > Mar 1999 - Oct 2003, 4.9L, V8, 32V, DOHC, MPFI, E39, 294kW, EngCode: S62B50

BMW > X5 > Nov 2000 - Dec 2003, 4.4L, V8, 32V, DOHC VVT, MPFI, E53, 210kw, EngCode: M62TUB44

BMW > X5 > Feb 2002 - Oct 2003, 4.6L, V8, 32V, DOHC, EFI, E53, 255kW, EngCode: M62B46

Land Rover > Range Rover > Aug 2002 - Jul 2005, 4.4L, V8, 32V, DOHC VVT, MPFI, 210kW, EngCode: M62TUB44