Dayco 89631 lower belt tensioner for the 2011-2025 Ford F-150 V8 5.0L, the 2023-2025 F-150 V8 5.2L and other vehicles holds the serpentine belt under tension as the engine runs. This Dayco automatic belt tensioner is also called a serpentine belt tensioner.
- Automatic type for a serpentine belt drive
- Single flat pulley, 70 mm in diameter
- Pulley width of 26 mm
- Lower position at the alternator in the main drive
Quick facts
- Part: Dayco 89631 belt tensioner
- Also called: serpentine belt tensioner
- Fits: the 2011-2025 Ford F-150 V8 5.0L, the 2023-2025 F-150 V8 5.2L and other vehicles
- Position: Lower, alternator, main drive
- Condition: New
A squealing belt, a fluttering belt or a noisy tensioner pulley can point to a worn tensioner. Noise alone does not prove this part is the problem, since a glazed or stretched belt is another common source of it.
Fits
This tensioner fits the 2011-2025 Ford F-150 V8 5.0L and the 2023-2025 F-150 V8 5.2L, as well as the 2011-2025 Ford Mustang V8 5.0L and the 2015-2022 Mustang V8 5.2L.
Specifications
Fit and size
- Position: lower, alternator, main drive
- Quantity per vehicle: 1
- Number of pulleys: 1
- Pulley diameter: 70 mm
- Pulley width: 26 mm
Build and materials
- Type: automatic
- Belt type: serpentine
- Direction: clockwise
- Pulley: flat
- Condition: new
In the box
One belt tensioner. The engine takes one, so this listing covers it.
Interchange: 39298 · 780207 · 49821 · 999830A · BR3Z6B209H · BT100 · BT103
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Does Dayco 89631 work as a belt tensioner for the 2011-2025 Ford F-150 V8 5.0L?
Yes. Dayco 89631 fits the 2011-2025 Ford F-150 V8 5.0L and the 2023-2025 F-150 V8 5.2L.
Is there a Mustang belt tensioner from Dayco for the 2011-2025 Ford Mustang V8 5.0L?
Yes. Dayco 89631 fits the 2011-2025 Ford Mustang V8 5.0L and the 2015-2022 Mustang V8 5.2L.
What size pulley does the Dayco belt tensioner have?
This belt tensioner has one flat pulley, 70 mm in diameter and 26 mm wide.
Is the Dayco tensioner automatic, and which type of belt does it run?
Yes. This is an automatic tensioner built for a serpentine belt, with a clockwise direction.
Does this lower belt tensioner replace BR3Z6B209H?
Yes. BR3Z6B209H is one of the numbers this Dayco 89631 belt tensioner replaces, along with BT100 and BT103.
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