Dayco Automatic Belt Tensioner BMW 320i 323Ci 323i 325i 328Ci 328i 525i 528i M

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 > 320i > Apr 1991 - Dec 1995, 2.0L, 6 cyl, 24V, DOHC, MPFI, E36, 110kW, EngCode: M50

BMW > 320i > Jan 1992 - Jul 1995, 2.0L, 6 cyl, 24V, DOHC, MPFI, E36, 110kW, EngCode: M50

BMW > 320i > 1995 - 1998, 2.0L, 6 cyl, 24V, DOHC, MPFI, E36, 110kW, EngCode: M52B20

BMW > 320i > 1998 - 2000, 2.0L, 6 cyl, 24V, DOHC, MPFI, E46, 110kW, EngCode: M52B20

BMW > 323Ci > Jun 1999 - Oct 2000, 2.5L, 6 cyl, 24V, DOHC, MPFI, E46, EngCode: M52B25

BMW > 323i > Jan 1995 - Aug 1999, 2.5L, 6 cyl, 24V, DOHC, MPFI, E36, 125kW, EngCode: M52B25

BMW > 323i > Sep 1998 - Oct 2000, 2.5L, 6 cyl, 24V, DOHC, MPFI, E46, 125kW, EngCode: M52B25

BMW > 325i > Apr 1991 - Sep 1991, 2.5L, 6 cyl, 24V, DOHC, EFI, E36, 141kW, EngCode: M50B25

BMW > 325i > Oct 1991 - Mar 1995, 2.5L, 6 cyl, 24V, DOHC, EFI, E36, 141kW, EngCode: M50B25

BMW > 328Ci > Jun 1999 - Sep 2000, 2.8L, 6 cyl, 24V, DOHC, MPFI, E46, EngCode: M52TUB28

BMW > 328i > Jun 1995 - Sep 2000, 2.8L, 6 cyl, 24V, DOHC, MPFI, E36, 142kW, EngCode: M52B28

BMW > 328i > Sep 1999 - Oct 2000, 2.8L, 6 cyl, 24V, DOHC, MPFI, E46, 142kW, EngCode: M52TUB28

BMW > 525i > Nov 1990 - Sep 1991, 2.5L, 6 cyl, 24V, DOHC, MPFI, E34, EngCode: M50B25

BMW > 525i > Oct 1991 - Jan 1992, 2.5L, 6 cyl, 24V, DOHC, MPFI, E34, EngCode: M50B25

BMW > 525i > Feb 1992 - Mar 1996, 2.5L, 6 cyl, 24V, DOHC, MPFI, E34, EngCode: M50B25

BMW > 528i > Apr 1996 - Feb 1998, 2.8L, 6 cyl, 24V, DOHC, MPFI, E39, 142kW, EngCode: M52B28

BMW > 528i > Mar 1998 - Sep 1998, 2.8L, 6 cyl, 24V, DOHC, MPFI, E39, 142kW, EngCode: M52B28

BMW > 528i > Oct 1998 - Nov 2000, 2.8L, 6 cyl, 24V, DOHC, MPFI, E39, 142kW, EngCode: M52TUB28

BMW > 528i > Oct 1998 - Nov 2000, 2.5L, 6 cyl, 24V, DOHC, MPFI, E39, 125kW, EngCode: M52B25

BMW > M > Oct 1998 - Dec 2001, 3.2L, 6 cyl, 24V, DOHC, MPFI, Z3M, EngCode: S50B32

BMW > M3 > Jun 1994 - Dec 1995, 3.0L, 6 cyl, 24V, DOHC, MPFI, E36, EngCode: S50B30

BMW > M3 > Feb 1996 - Jun 2000, 3.2L, 6 cyl, 24V, DOHC, MPFI, E36, 236kW, EngCode: S50B32

BMW > Z3 > Apr 1997 - Sep 1998, 2.8L, 6 cyl, 24V, DOHC, MPFI, E36, EngCode: M52TUB28

BMW > Z3 > May 1997 - Jul 2000, 3.2L, 6 cyl, 24V, DOHC, MPFI, E36, 236kW, EngCode: S50B32

BMW > Z3 > Oct 1998 - Sep 2000, 2.8L, 6 cyl, 24V, DOHC, MPFI, E36, EngCode: M52B28