2018 Ram 1500 Serpentine Belt Guide

Quick Answer

• Belt Length: 92.25 inches (2343 mm)
• Rib Count: 6-rib
• OEM Belt Part Number: Mopar 53013952AC
• Aftermarket Cross-References:
  • Gates K060915
  • Dayco 5060915
  • Continental Elite 4060915
• Auto-Tensioner Part Number: Mopar 53032859AB; Gates 38352
• Idler Pulley Part Number: Mopar 05281500AA; Gates 36297

Note: The part numbers above are for the 5.7L V8 engine. The 3.6L V6 uses a different belt and components. Always verify fitment with your VIN before purchasing parts.

Belt Routing

Properly routing the serpentine belt is crucial for the correct operation of your engine's accessories. Before removing the old belt, we strongly recommend taking a clear photograph of the existing belt routing to use as a reference.

For the 2018 Ram 1500 with the 5.7L V8 engine, the belt follows this path:

1. Starts at the main crankshaft pulley at the bottom of the engine.
2. Wraps around the A/C compressor pulley.
3. Goes up and around the smooth idler pulley.
4. Travels to the alternator pulley.
5. Comes down to the power steering pump pulley.
6. Goes around the water pump pulley.
7. Finally, loops around the tensioner pulley, which maintains the correct belt tension.

How to Replace the Serpentine Belt

Replacing the serpentine belt is a manageable task for a DIYer with the right tools. You will need a serpentine belt tool or a long-handled 3/8" breaker bar.

1. Locate the Tensioner: The auto-tensioner is typically located between the water pump and the A/C compressor. It has a square 3/8" drive hole in the body of the tensioner arm.
2. Release Tension: Insert the 3/8" drive end of your breaker bar or serpentine belt tool into the square hole on the tensioner. Pivot the tensioner arm to release the tension on the belt. You do not need to unbolt the tensioner itself.
3. Remove the Old Belt: While holding the tensioner in the released position, carefully slip the old belt off one of the pulleys (the alternator or idler pulley is often easiest).
4. Install the New Belt: Following your reference photo and the routing diagram described above, thread the new belt around all the pulleys, saving the tensioner or another smooth pulley for last. Double-check that the belt's ribs are correctly seated in the grooves of each ribbed pulley.
5. Apply Tension: Slowly release the tensioner, allowing its spring-loaded mechanism to apply the correct tension to the new belt. Visually inspect the entire belt path one last time to ensure it is properly aligned and seated on all pulleys.

Replacement Interval

While there is no universally mandated replacement interval for the serpentine belt on a 2018 Ram 1500, a general rule of thumb is to inspect it during every oil change and plan for replacement between 60,000 and 90,000 miles. Driving in harsh conditions (extreme heat, dust) may warrant earlier replacement.

Signs of a Failing Belt or Tensioner

Be alert for these warning signs, which indicate it's time for an inspection or replacement:

• Squealing or Chirping Noises: This is the most common sign of a worn, glazed, or misaligned belt.
• Visible Wear: Look for cracks, fraying, glazing (shiny surface), or missing ribs on the belt.
• Accessory Malfunction: The serpentine belt drives the alternator, power steering, and A/C. If your battery isn't charging, steering becomes heavy, or the A/C stops blowing cold, a failed belt could be the culprit.
• Tensioner Noise: A grinding or rattling noise from the tensioner pulley indicates a failing bearing.
• "Bouncing" Tensioner Arm: If you see the tensioner arm vibrating or bouncing erratically while the engine is running, the internal spring is weak, and it is no longer providing adequate tension.

If you're not comfortable performing this service yourself, you can always find a trusted and certified repair shop in your area.