16620-31040 Accessory Drive Belt Tensioner for Toyota Camry Sienna RAV4 Lexus ES350 RX350 3.5L

◆ This accessory drive belt tensioner is a direct replacement for the original Toyota unit, designed to maintain proper tension on the serpentine belt that drives the alternator, water pump, and A/C compressor.

◆ The OEM reference number is 16620-31040. Toyota‘s parts catalog designates this component as “TENSIONER ASSY, V-RIBBED BELT” .

◆ The tensioner assembly is engineered to OEM standard dimensions for direct fitment onto the engine front cover without modification.

◆ It is primarily designed for the 3.5L V6 engine (2GR-FE and related variants), covering a wide range of Toyota and Lexus models including the Avalon, Camry, Highlander, RAV4, Sienna, Venza, ES350, RX350, and RX450h, with model years spanning approximately 2005 through 2018 .

◆ This product is a serpentine belt tensioner assembly manufactured to meet original quality standards for tension control, bearing durability, and fit.

◆ Part Number: 16620-31040

◆ Component Type: Accessory Drive Belt Tensioner / Serpentine Tensioner Assembly

◆ Vehicle Make: Toyota / Lexus

◆ Engine Compatibility: 3.5L V6 (2GR-FE and related)

◆ Pulley Outer Diameter: Approx. 70 mm (aftermarket reference)

◆ Pulley Width: Approx. 33.5 mm (aftermarket reference)

◆ Weight: Approx. 1.49 kg (aftermarket reference)

◆ Note: Mounting bolts and belt are typically separate parts and are not included

◆ OEM Standard Fit: Manufactured to exact original specifications for a direct, hassle-free replacement.

◆ Automatic Tension Control: Spring-loaded design maintains consistent belt tension throughout the accessory drive system’s operating range.

◆ Durable Construction: Built with materials resistant to heat, vibration, and engine bay conditions for long service life.

◆ Noise Reduction: Eliminates belt squeal and chirping caused by a worn or seized tensioner pulley .

◆ Toyota Avalon (3.5L V6): 2005–2018

◆ Toyota Camry (3.5L V6): 2007–2017

◆ Toyota Highlander (3.5L V6, non-hybrid): 2008–2016

◆ Toyota RAV4 (3.5L V6): 2006–2012

◆ Toyota Sienna (3.5L V6): 2007–2016

◆ Toyota Venza (3.5L V6): 2009–2015

◆ Lexus ES350 (3.5L V6): 2007–2018

◆ Lexus RX350 (3.5L V6): 2007–2015

◆ Lexus RX450h (3.5L V6 Hybrid): 2010–2015

Q1: Is this a genuine Toyota part?

A: This listing refers to a replacement part manufactured to meet or exceed OEM standards. The 16620-31040 reference is the original equipment part number. Both genuine Toyota/Lexus and aftermarket equivalents are available that match the original fit and function.

Q2: How do I confirm if it fits my vehicle?

A: Check your vehicle’s existing part number. If your current belt tensioner is stamped with 16620-31040, this replacement will fit. Also confirm your vehicle is equipped with the 3.5L V6 engine and matches one of the models listed above.

Q3: What are the symptoms of a failing belt tensioner?

A: Common signs include a squealing or chirping noise from the engine bay, especially on cold start or acceleration; visible belt wear or misalignment; and a tensioner pulley that feels loose or does not spring back properly when the belt is removed. Replacing the tensioner is recommended when these symptoms appear .