Ram 3500 Serpentine Belt Replacement Guide (2011-2019)
Keep your 6.7L Cummins running strong by understanding when and why to replace your serpentine belt.
- Inspect the belt for cracks and fraying, and listen for squealing noises, especially on startup.
- When replacing the belt, always check the tensioner and idler pulleys for noise or roughness; it's best practice to replace them as a set.
- For heavy-duty use, consider a premium belt like the Gates FleetRunner for added durability.
- A failing belt can cause critical systems like the water pump and alternator to stop working, leading to engine overheating or loss of electrical power.
Is Your Serpentine Belt Failing?
A failing serpentine belt on your Ram 3500 will give you clear warning signs. Ignoring them can leave you stranded. Be on the lookout for these common symptoms:
- Squealing or Chirping Noises: This is the most common sign. A high-pitched squeal, especially on startup, in wet weather, or when accelerating, means the belt is slipping. This can be due to wear, stretching, or a weak tensioner.
- Visible Wear and Damage: Pop the hood and look at the belt. If you see cracks, fraying, missing chunks, or a glazed, shiny appearance on the belt's surface, it's time for a replacement.
- Accessory or Electrical Issues: Since the belt powers the alternator, a failing belt can cause dimming headlights, a battery warning light on the dash, or other electrical gremlins. You might also notice your A/C isn't blowing cold or the power steering feels heavy.
- Engine Overheating: The serpentine belt drives the water pump. If the belt slips or breaks, the water pump stops circulating coolant, which will cause the engine to overheat quickly.
Check the Tensioner and Pulleys
Often, the belt itself isn't the only problem. The automatic belt tensioner and idler pulleys are common failure points on the 6.7L Cummins. A bad bearing in a pulley can cause noise, damage the new belt, or even seize and break the belt. When replacing the belt, it's a pro-tip to spin all the pulleys by hand. They should spin smoothly and quietly. If you feel any roughness or hear grinding, replace the pulley or tensioner along with the belt.
🎬 Learn how to identify clicking noises from your tensioner and pulleys.Choosing the Right Aftermarket Belt for Your Ram
You don't have to buy an OEM Mopar belt to get good quality. Several aftermarket brands offer excellent, and sometimes superior, performance. For a heavy-duty truck like the Ram 3500, choosing a quality belt is important.
| Brand Tier | Brands | Quality & Performance Assessment |
|---|---|---|
| Premium Aftermarket | Gates (especially FleetRunner), Continental | Gates is a highly recommended brand in truck forums, with their green "FleetRunner" belts noted for being heavy-duty and less prone to stretching. Continental is also considered a top-tier OEM-quality brand. Many users have had long-term success with both. |
| Standard / OEM-Equivalent | Dayco, Mopar (OEM) | Dayco is a solid, reliable choice and is considered an OEM-equivalent brand by many mechanics. Some Ram trucks even came with Dayco belts from the factory. Mopar belts are a safe bet for guaranteed fit and function, though they are often more expensive than comparable aftermarket options. |
Known Issues, TSBs, or Recalls
While there are no major recalls specifically for the serpentine belt on the 2011-2019 Ram 3500, some related Technical Service Bulletins (TSBs) have been issued for noises in the belt area. TSB #0901323 mentions squeak, chirp, or tick noises from the serpentine belt area, suggesting additional diagnostics may be needed. This reinforces the importance of checking the tensioner and pulleys, as they are often the root cause of belt noise and premature failure. Some owners of Ram trucks have reported issues with belts being thrown in wet conditions, which often points to an underlying issue with pulley alignment or a weak tensioner.
Frequently Asked Questions (FAQ)
How often should I replace the serpentine belt on my Ram 3500?
There isn't a strict mileage interval, but many recommend inspecting it starting around 40,000 miles and replacing it around 100,000 miles as preventative maintenance. However, visual inspection is the best guide. If the belt is cracked, frayed, or noisy, replace it regardless of mileage.
Should I replace the tensioner and idler pulleys with the belt?
It's highly recommended, especially on a high-mileage truck. The tensioner and idler pulleys on the 6.7L Cummins are known wear items. A failing pulley can destroy a new belt quickly. Many brands sell complete kits that include the belt, tensioner, and idlers.
Is a Gates "Green Stripe" FleetRunner belt worth the extra cost?
Many diesel truck owners believe so. The Gates FleetRunner belts are designed for heavy-duty applications and are constructed to resist stretching and heat better than standard belts. For a hard-working truck, the added durability can provide extra peace of mind.
Can I replace the serpentine belt myself?
Yes, this is a DIY-feasible job for someone with mechanical experience. The main challenges are the tight space and properly routing the new belt. You will need a long breaker bar or a serpentine belt tool to release the tensioner. Taking a picture of the belt routing before you start is a crucial step.
Helpful Videos
Technical Specifications
OEM Part Numbers: 52014729AC 68206041AB 4627751AA 05281817AA
The serpentine belt for the 2011-2019 Ram 3500 with the 6.7L Cummins engine is a multi-ribbed (poly-v) belt. The exact length and number of ribs can vary based on the specific model year and accessories (e.g., single or dual alternator). Always verify the correct part number for your vehicle's VIN.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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