Gates 39457 belt tensioner for the 2018-2025 Lexus IS300 4-cylinder 2.0L and other vehicles keeps the accessory drive belt under steady tension. This Gates belt tensioner is a DriveAlign automatic unit, also called a serpentine belt tensioner.
- DriveAlign automatic belt tensioner
- Made to rigid tolerances and specifications for fit, form and function
- Patented labyrinth seal protects the internal components
- Patented vibration-damping system absorbs extreme vibration to improve the life of the tensioner, belt and accessories
- Torsional round spring design for reliability and consistent tension
Quick facts
- Part: Gates 39457 belt tensioner
- Also called: serpentine belt tensioner
- Fits: 2018-2025 Lexus IS300 4-cylinder 2.0L and other vehicles
- Material: Steel
- Condition: New
A squealing or chirping belt, a belt that wears unevenly, or a pulley that sounds rough can mean the tensioner is wearing out. These signs alone do not prove the tensioner is at fault; a worn belt makes similar noise.
Fits
The 2018-2025 Lexus IS300, the 2018-2022 Lexus RC300 and the 2018-2021 Lexus NX300, each with the 4-cylinder 2.0L, are among the Lexus models this tensioner fits. Open the "Vehicles it fits" section to check your exact model and engine.
Specifications
Fit and size
- Quantity per vehicle: 1
- Outside diameter: 65 mm (2.56 in)
- Bearing bore inside diameter: 17 mm (0.67 in)
- Width: 28 mm (1.1 in)
- Mounting holes: 2
- Pulley quantity: 1
Build and materials
- Material: Steel
- Belt type: V-ribbed
- Contact surface: smooth/backside, not flanged
- Condition: New
- Country of origin: China
In the box
One tensioner assembly. A single tensioner is listed here, and the quantity per application is 1.
Interchange: 49864 · 999665A · 999665 · 1662036061
This part cross-references / interchanges with the following part numbers:
39457, 49864, 999665A, 999665, 1662036061
Frequently Asked Questions
Is this a 2018-2025 Lexus IS300 belt tensioner for the 4-cylinder 2.0L?
Yes. Gates 39457 fits the 2018-2025 Lexus IS300 4-cylinder 2.0L. The "Vehicles it fits" section shows the other models and engines it covers.
What is this Gates drive belt tensioner made of?
The Gates 39457 is made of steel. It has one pulley with a smooth backside contact surface for a V-ribbed belt.
Does this tensioner come with a new drive belt?
No. The listing is one tensioner assembly only, so a drive belt is a separate part.
What are the bearing bore and pulley size on this tensioner?
The bearing bore is 17 mm (0.67 in). The pulley is 65 mm (2.56 in) in outside diameter and 28 mm (1.1 in) wide, and the tensioner has two mounting holes.
What does the vibration-damping system in this tensioner do?
The patented system absorbs extreme vibration to improve the life of the tensioner, the belt and the accessories. A patented labyrinth seal also protects the internal components.
