2019 Ford Ranger Serpentine Belt Routing & Replacement Guide

As an ASE-certified master technician, I’ve seen firsthand how a single snapped serpentine belt can leave a tough truck stranded on the side of the road. For the 2019 Ford Ranger (equipped with the 2.3L EcoBoost engine), keeping your accessory drive system in top condition is essential for running the alternator, water pump, and A/C compressor.

Whether you are performing preventative maintenance or diagnosing a squeal under the hood, this comprehensive guide provides all the part numbers, routing instructions, and expert tips you need to service your 2019 Ford Ranger’s serpentine belt system.

Quick Answer: Part Numbers & Specs

For the 2019 Ford Ranger 2.3L EcoBoost, here are the vital specifications and part numbers you’ll need before starting the job:

• Rib Count: 6-rib belt
• Belt Length: Approximately 53.3 inches
• OEM Belt Part Number: Motorcraft JK6-1049 (Ford PN: KB3Z-8620-A)
• Aftermarket Belt Cross-References:
  • Gates K060533
  • Continental Elite 4060533
  • Dayco 5060533
• Auto-Tensioner Part Number: Motorcraft BT-130 (Ford PN: KB3Z-6B209-A)
• Idler Pulley Part Number: Motorcraft YS-385

Note: The 2019 Ford Ranger utilizes Electronic Power-Assisted Steering (EPAS), meaning there is no hydraulic power steering pump on the accessory drive belt.

Belt Routing

Pro-tip: Always photograph your existing belt routing before removing the old belt. It is easy to forget the exact path once the belt is off the pulleys!

Because we cannot render an image, follow this text-based step-by-step description of the routing path for the 2.3L EcoBoost:

1. Start by looping the belt down around the bottom of the Crankshaft Pulley.
2. Route the belt straight up from the right side of the crank to the A/C Compressor.
3. From the A/C compressor, pass the smooth back side of the belt under the smooth Idler Pulley.
4. Bring the ribbed side of the belt up and over the Alternator.
5. Route it straight across to the Water Pump pulley.
6. Finally, pull the smooth back side of the belt down and around the Auto-Tensioner, returning back to the bottom of the Crankshaft Pulley.

How to Replace the Serpentine Belt

Replacing the drive belt on your Ranger is a straightforward job if you have the right tools. You will need a dedicated serpentine belt tool or a standard 3/8" drive breaker bar.

1. Locate the tensioner: Find the auto-tensioner assembly on the front of the engine block.
2. Relieve tension: Insert your 3/8" breaker bar or serpentine belt tool into the square receptacle on the tensioner arm. Rotate the tensioner counter-clockwise (away from the belt) to relieve the spring pressure.
3. Remove the old belt: While holding the tensioner open, slip the old belt off the nearest easily accessible pulley (usually the idler or alternator). Carefully release the tensioner back to its resting position.
4. Inspect pulleys: Spin the idler, alternator, and water pump pulleys by hand. Listen for grinding noises and check for wobble. If the tensioner or idler feels gritty, replace them now.
5. Install the new belt: Route the new belt following the path described above, leaving the easiest pulley for last.
6. Apply tension: Compress the auto-tensioner again, slip the belt over the final pulley, and slowly release the tensioner so it clamps down on the belt. Double-check that all ribs are perfectly seated in the pulley grooves before starting the engine.

Replacement Interval

Ford's general recommendation is to inspect the serpentine belt every 15,000 miles. Under normal driving conditions, the factory EPDM belt can last up to 100,000 miles or 10 years. However, if you use your Ranger for heavy towing, off-roading, or live in a climate with extreme temperature swings, expect to replace it closer to the 60,000 to 75,000-mile mark. It is highly recommended to replace the auto-tensioner and idler pulley at the same time as the belt, as their internal bearings wear out at a similar rate.

Signs of a Failing Belt or Tensioner

Don't wait for the belt to snap. Watch out for these warning signs:

• High-Pitched Squealing: Often most noticeable on cold startups or when turning on the A/C, indicating belt slip or a weak tensioner spring.
• Visible Cracks or Fraying: Deep cracks in the ribs, missing chunks of rubber, or frayed edges mean immediate replacement is required.
• Rhythmic Ticking or Chirping: This usually indicates a failing bearing in the idler pulley or the tensioner assembly.
• Heavy Glazing: A shiny, glassy appearance on the belt’s ribbed side reduces friction and causes slipping.
• Battery or Overheating Warnings: If the belt is slipping badly, the alternator and water pump won't spin at the correct speed, leading to charging system faults or engine overheating.

If you don’t feel comfortable tackling this maintenance item in your own driveway, don’t risk a breakdown. Find a trusted shop on Repairius.