DIY Guide: Replacing The Drive Belt And Tensioner On A 2015 Chrysler 300

By Nick Marchenko, PhD

Welcome, fellow auto enthusiasts, to a grand tour of maintaining the noble steed that is the 2015 Chrysler 300. Today, we venture into the mechanical jungle to replace the serpentine belt and tensioner. A task that may seem daunting, but with the right tools and a bit of patience, you'll soon find it's a rather splendid way to spend an afternoon.

Understanding Your Chrysler 300's Heart

The 2015 Chrysler 300, with its robust 3.6L Pentastar engine, is a rear-wheel-drive titan, devoid of the conventional power steering pump thanks to its electronic assist. This small difference simplifies the belt's path slightly, easing our task.

The Tools of the Trade

Before we embark on this mechanical odyssey, ensure you have the following:

• A new serpentine belt and tensioner kit
• A 16mm socket for the tensioner bolt
• An 8mm socket for air intake cover clamps
• A ratchet or breaker bar (3/8" drive recommended)

Shop From Amazon

DEWALT Mechanics Tool Set, 1/4" & 3/8" & 1/2" Drive, SAE/Metric, 205-piece (DWMT81534)

Craftsman Mechanic Tool Set, 215 Piece, Hand Box Set in Metal, 3 Drawers, Red (CMMT45303)

Craftsman Mechanic Tool Set, 230 Piece with 3 Drawers, Sockets, Extension Bars, Wrenches,...

Preparation: The Key to Success

Begin by removing the air intake cover to unveil the engine's pulsing heart. This requires removing two 8mm clamps and disconnecting the MAP sensor. Ah, the manifold absolute pressure sensor, a critical component for your Chrysler's proper breathing.

For a deeper dive into maintaining your vehicle's respiratory system, check out our guides on replacing the MAP light bulb and checking the engine coolant.

The Main Event: Belt and Tensioner Replacement

With the stage set, our next act is to relieve the tensioner of its duty, liberating the serpentine belt from its pulleys. As you embark on this, remember, the journey is as rewarding as the destination. Should you encounter an idler pulley that protests with the sound of a thousand discontented squeaks, it's a sign to replace it alongside the tensioner.

Acquiring a kit that includes both the tensioner and the belt is a savvy move, ensuring harmony in your engine's ecosystem. If the front side of your engine is a trove of accessibility, consider yourself fortunate. In less accessible realms, replacing all components at once is not merely recommended; it's a testament to your mechanical wisdom.

Installation: The Rebirth

With the old components consigned to history, align the new tensioner's tab with the engine's indent, a simple yet crucial step ensuring your engine's smooth operation. The serpentine belt, fresh and unyielding, may initially resist your efforts. Start with the crankshaft, the heart of the engine, before guiding the belt through its destined path over the pulleys.

Once the belt is positioned, use your ratchet or breaker bar to coax the tensioner into place, allowing the belt to embrace its new home. This moment, as the tensioner and belt unite, symbolizes the completion of your quest.

The Finishing Touches

Before declaring victory, double-check the belt's alignment, ensuring every ridge and groove finds its mate. With the engine's heart beating anew, reattach the air intake cover and MAP sensor, the final step in this mechanical ballet.

Curious about other adventures in automotive maintenance? Explore our guides on replacing the trunk actuator, windshield wiper replacement, and the ever-vital oil and filter change.

In conclusion, the path to replacing your Chrysler 300's drive belt and tensioner is strewn with opportunities for growth, learning, and perhaps a skinned knuckle or two. But fear not, for the reward is a smoothly running chariot, ready to carry you forth on your next grand tour.

Nick Marchenko, PhD

Industrial Engineer & Automotive Content Specialist

Nick writes in-depth guides on car clubs, engine specs, vehicle ownership, and modifications, combining engineering knowledge with automotive passion.

Full profile → LinkedIn →