2023 Ford F-250 Super Duty Serpentine Belt Guide

Quick Answer

• Belt Length: Approximately 106.5 inches (for the 7.3L V8 "Godzilla" gas engine)
• Rib Count: 6-rib
• OEM Belt P/N: MC3Z-8620-A (for 7.3L gas engine)
• Aftermarket Cross-Reference:
  • Gates K061065
  • Dayco 5061065
  • Continental Elite 4061065
• Auto-Tensioner P/N: HC3Z-6B209-C (for 7.3L gas engine)
• Idler Pulley P/N: FL3Z-8678-A (for 7.3L gas engine)

Note: Part numbers and belt lengths can vary by engine option. This guide focuses on the 7.3L V8 "Godzilla" gas engine. Always verify part numbers with your VIN for exact fitment.

Belt Routing (7.3L V8 "Godzilla" Gas Engine)

Before you begin any work, it's a good idea to take a clear photograph of your current belt routing. This will serve as an invaluable reference during reinstallation.

The serpentine belt on your 2023 Ford F-250 Super Duty (7.3L V8 gas engine) follows a specific path to drive various accessories. Starting from the crankshaft pulley at the bottom, the belt typically routes as follows:

1. From the crankshaft pulley, the belt goes up and to the right, engaging the A/C compressor pulley.
2. From the A/C compressor, the belt continues upwards to the idler pulley located above it.
3. After wrapping around the idler pulley, the belt then heads left and slightly down to the alternator pulley.
4. From the alternator, the belt stretches further left to the power steering pump pulley.
5. Leaving the power steering pump, the belt goes down and to the right, around the water pump pulley.
6. Finally, from the water pump, the belt leads to the automatic tensioner pulley, which maintains the proper tension on the belt before it returns to the crankshaft pulley to complete the loop.

Always double-check the routing diagram, often found on a sticker under the hood, to ensure correct installation for your specific vehicle configuration.

How to Replace the Serpentine Belt

Replacing the serpentine belt on your 2023 Ford F-250 Super Duty requires a few basic tools and a careful approach.

1. Safety First: Ensure the engine is off and cool. Disconnect the negative terminal of the battery to prevent accidental starting.
2. Locate the Tensioner: Identify the automatic belt tensioner. It will have a square hole (usually 3/8-inch or 1/2-inch) designed for a breaker bar or a specialized serpentine belt tool.
3. Release Tension: Insert the appropriate-sized breaker bar or serpentine belt tool into the square opening on the tensioner. Apply steady leverage to rotate the tensioner arm, relieving tension on the belt. This will allow you to slip the belt off one of the smoother pulleys (like an idler pulley or the alternator). Be careful not to let the tensioner snap back.
4. Remove the Old Belt: Once the tension is released, carefully slip the old belt off all the pulleys. Take note of the routing one last time, or refer to the photo you took earlier.
5. Inspect Pulleys: Before installing the new belt, inspect all pulleys for wear, damage, or excessive play. Any worn pulleys should be replaced at this time.
6. Install the New Belt: Following the routing diagram (or your photo), carefully route the new belt around all the pulleys, leaving one pulley (preferably an idler or the alternator) for last.
7. Apply Tension: Again, use your breaker bar or serpentine belt tool to rotate the tensioner arm, creating slack. While holding the tensioner open, slip the new belt over the final pulley. Slowly release the tensioner, ensuring the belt seats correctly in all the pulley grooves.
8. Verify Routing: Once the tensioner is released, double-check that the belt is properly seated in all grooves on all pulleys and that the routing is correct.
9. Reconnect Battery: Reconnect the negative battery terminal.
10. Test: Start the engine and listen for any unusual noises. Allow the engine to run for a minute or two, then turn it off and visually inspect the belt again to ensure it's tracking correctly.

Replacement Interval

Ford typically recommends inspecting the serpentine belt on your F-250 Super Duty every 15,000 to 30,000 miles or annually, and replacing it as needed. General recommendations for replacement are often around 60,000 to 100,000 miles. However, severe driving conditions, extreme temperatures, or frequent heavy towing can accelerate wear. It