YzusGomumu Serpentine Drive Belt Tensioner Pulley Kit for Jeep Wrangler 3.6L (2012-2018) — tensioner, 2 idlers & serpentine belt

The YzusGomumu Serpentine Drive Belt Tensioner Pulley Kit is a complete replacement assembly that restores proper belt tension and smooth accessory drive operation on compatible Jeep Wrangler 3.6L engines.

If your Wrangler is showing belt noise, squeal, or accessory drive issues, a worn tensioner, idler pulley, or serpentine belt is often the cause. This kit bundles a heavy-duty drive belt tensioner, two idler pulleys and a replacement serpentine belt engineered to meet factory fitment and improve reliability under vibration and heat. Components use high-strength alloy steel and aluminum with heat-treated surfaces to maintain dimensional accuracy and resist premature wear.

How does this kit improve drive-belt performance?

The tensioner and idler pulleys keep the serpentine belt aligned and under correct tension, reducing slippage and uneven wear. That leads to steadier power transfer to alternator, water pump and other accessories while lowering the chance of sudden belt failure.

• Maintains consistent belt tension across operating ranges.
• Reduces belt noise and vibration during idling and acceleration.
• Protects accessories by preventing excessive backlash and slip.

Will this fit my Jeep Wrangler 3.6L?

This kit is intended for Jeep Wrangler models equipped with the 3.6L engine: model years 2012–2017 and 2018 JK with matching engine configuration. Verify the OE numbers against your existing parts to ensure exact compatibility before installation.

• Compatible model years: 2012–2017 Jeep Wrangler 3.6L and 2018 Jeep Wrangler JK 3.6L.
• Reference OE numbers: 90K-39415, 4627038AA-KIT, 4627038AAKIT.
• Always cross-check with your vehicle’s part numbers prior to purchase.

What comes in the package and what are the materials?

The kit includes one drive belt tensioner, two idler pulleys and one serpentine belt—everything required to renew the belt drive path in one service. Components are manufactured from high-strength alloy steel and aluminum with advanced surface and heat treatments for durability under repetitive loads.

• Package contents: 1 tensioner, 2 idler pulleys, 1 serpentine belt.
• Materials: alloy steel and aluminum alloy with heat-treated surfaces.
• Designed to withstand engine vibration, torsion and thermal cycling.

How difficult is installation and what should I expect after replacing it?

Installation is comparable to most accessory drive service procedures; basic hand tools and a belt routing diagram are usually sufficient. After replacing worn components you should notice quieter operation, more consistent accessory performance, and extended life for the belt and pulleys.

• Typical install: moderate mechanical skill, hand tools required.
• Expect reduced belt squeal and improved accessory response.
• Check belt alignment and pulley spin after installation for smooth operation.

Who is this for: This YzusGomumu kit is aimed at Jeep Wrangler owners and independent mechanics who want a complete, high-strength replacement for worn serpentine drive components on 3.6L engines. It suits anyone restoring accessory-drive reliability—DIYers replacing aging parts, technicians performing routine maintenance, and fleet operators seeking consistent performance across vehicles. Always confirm fitment with your vehicle’s part numbers before ordering.