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Dayco 89077 Accessory Drive Belt Idler Assembly - Smooth Pulley
| Brand | Dayco 89077 |
|---|---|
| Position | Smooth Pulley |
| 28 | |
| 70 | |
| Bearing Inner Diameter 1 | 8 |
| Bearing Inner Diameter 2 | 24 |
| Bearing Width | 19.6 |
| Belt Type | Serpentine |
| Flat | Y |
| Material | Polymer |
| Max Belt Width | 06 Rib |
| Number of Bearings | 1 |
| Fits | BMW · 10 vehicles |
Serpentine belt idler assembly. Keeps the accessory drive belt running smoothly.
Polymer construction. Lightweight material helps reduce overall rotating mass.
Single-bearing design. Built for smooth, reliable belt guidance.
Cross-references ACDelco 38066, BMW 11 28 1 478 130 and BMW 11 28 1 702 013 for the same application. See all 9.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Dayco 89077 Accessory Drive Belt Idler Assembly
The Dayco 89077 accessory drive belt idler assembly is a polymer idler designed for serpentine belt routing in the accessory drive system. It is built with a single bearing and a flat pulley profile to support smooth belt travel on select BMW applications, including BMW Z4, 530i, and 540i models.
Key Features
- Polymer construction for lightweight accessory drive belt support
- Serpentine belt type with a flat pulley design
- Single bearing design for belt tracking in the accessory drive system
- Bearing inner diameters: 8 mm and 24 mm
- Bearing width: 19.6 mm
- Maximum belt width: 6-rib
- Direct-fit application coverage for select BMW models
Detailed Description
Dayco 89077 is an accessory drive belt idler assembly engineered for serpentine belt systems where a smooth pulley is required. The polymer pulley construction and bearing specifications are matched to the accessory drive layout used on select BMW vehicles. This part cross-references ACDelco 38066 and Gates 38066 for the same application. Fits 2003-2005 BMW Z4, Smooth Pulley. Fits 1994-1995 BMW 530i, N/A. Fits 1994-1995 BMW 540i, N/A. For buyers searching for a BMW Z4 accessory drive belt idler assembly or a Dayco 89077 serpentine belt idler for BMW 530i and 540i, this part provides a direct replacement option.
Common Issues This Part May Address
- Worn or noisy idler pulley bearing
- Belt squeal caused by pulley drag or rough bearing movement
- Uneven serpentine belt tracking across the accessory drive system
- Visible pulley wear on the belt routing path
- Accessory drive belt vibration related to idler wear
Installation Notes and Tips
Verify pulley style, belt width, and bearing dimensions before installation. Confirm the vehicle application against the listed BMW fitment and inspect the serpentine belt, tensioner, and adjacent pulleys for wear at the same time. Use the correct belt routing for the accessory drive system and ensure the pulley runs true after installation.
Quality Assurance
Dayco is a recognized name in belt drive components, and this idler assembly is specified with defined material and bearing measurements for application matching. Confirm part number 89077 against the vehicle’s accessory drive configuration before ordering.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2005 | BMW | Z4 | 2.5L | L6 | Smooth Pulley | — |
| 2005 | BMW | Z4 | 3.0L | L6 | Smooth Pulley | — |
| 2004 | BMW | Z4 | 2.5L | L6 | Smooth Pulley | — |
| 2004 | BMW | Z4 | 3.0L | L6 | Smooth Pulley | — |
| 2003 | BMW | Z4 | 2.5L | L6 | Smooth Pulley | — |
| 2003 | BMW | Z4 | 3.0L | L6 | Smooth Pulley | — |
| 1995 | BMW | 530i | — | — | N/A | — |
| 1995 | BMW | 540i | — | — | N/A | — |
| 1994 | BMW | 530i | — | — | N/A | — |
| 1994 | BMW | 540i | — | — | N/A | — |
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