2017 Ford F-150 Serpentine Belt Routing & Part Numbers

Quick Answer

• Belt Length: Varies by engine
• Rib Count: 6-rib
• OEM Belt PN: Varies by engine
• Aftermarket Cross-references:
  • Gates: K06xxxx (specific part numbers vary by engine)
  • Dayco: 506xxxx (specific part numbers vary by engine)
  • Continental Elite: 406xxxx (specific part numbers vary by engine)
• Auto-Tensioner PN: Varies by engine
• Idler Pulley PN: Varies by engine

Belt Routing

Note: Before removing your serpentine belt, it is highly recommended to take a clear photograph of the existing belt routing. This will serve as an invaluable reference during reinstallation.

The 2017 Ford F-150 has several engine options, and the serpentine belt routing can vary slightly between them. Below is a general routing description, and you should always refer to your specific engine's diagram if available, or the photo you took before removal.

General Routing (always confirm with your specific engine):

The serpentine belt typically starts at the crankshaft pulley (the largest pulley at the bottom, driven directly by the engine). From there, it may route to the A/C compressor (usually located low on one side of the engine). The belt then often goes over an idler pulley (a smooth, non-driven pulley that helps guide the belt). Next in line is typically the alternator (usually mounted higher up on the engine, generating electrical power). From the alternator, it might proceed to the power steering pump (if equipped, often located on the front of the engine). Following the power steering pump, it then wraps around the water pump (circulating coolant through the engine). Finally, the belt usually goes to the automatic tensioner, which maintains the correct belt tension, before returning to the crankshaft pulley.

How to Replace the Serpentine Belt

Replacing a serpentine belt on a 2017 Ford F-150 is a moderately challenging DIY task that requires some specific tools. Always ensure the engine is cool before attempting any work.

1. Safety First: Disconnect the negative battery terminal to prevent accidental starting.
2. Locate the Tensioner: Identify the automatic belt tensioner. It typically has a square opening (often 3/8" or 1/2") designed for a breaker bar or a serpentine belt tool.
3. Relieve Tension: Insert a serpentine belt tool or a breaker bar into the square opening of the tensioner. Rotate the tensioner to release the tension on the belt. While holding the tensioner in place, carefully slip the belt off one of the pulleys (usually an idler or the alternator).
4. Remove the Old Belt: Once the tension is released, completely remove the old belt from all pulleys.
5. Inspect Pulleys: Before installing the new belt, inspect all pulleys for any signs of wear, damage, or excessive play. Ensure they spin freely without excessive noise.
6. Route the New Belt: Following the routing diagram (or your pre-removal photo), carefully route the new serpentine belt around all the pulleys, leaving the tensioner pulley or one easy-to-access pulley for last.
7. Apply Tension: Again, use your serpentine belt tool or breaker bar to release the tensioner, and then slip the new belt over the final pulley. Slowly release the tensioner to allow it to apply proper tension to the new belt.
8. Double-Check: Visually inspect to ensure the belt is correctly seated in all pulley grooves and that no part of the belt is twisted or pinched.
9. Reconnect Battery: Reconnect the negative battery terminal.
10. Test: Start the engine and listen for any unusual noises. Observe the belt's operation to ensure it's running smoothly.

Replacement Interval

The serpentine belt on a 2017 Ford F-150 typically has a recommended inspection interval of every 60,000 to 100,000 miles or every 4 to 6 years, whichever comes first. However, it's crucial to consult your F-150's owner's manual for the precise recommended maintenance schedule for your specific engine and trim. If you notice any signs of wear or failure, the belt should be replaced immediately, regardless of mileage or age.

Signs of a Failing Belt or Tensioner

It's important to recognize the warning signs of a failing serpentine belt or tensioner to prevent more serious issues.

Signs of a Failing Serpentine Belt:

• Squealing or Chirping Noises: This is one of the most common indicators, especially on cold starts or when turning the steering wheel (if the power steering pump is belt-driven).
• Cracks or Fraying: Visual inspection may reveal cracks, splits, missing ribs, or fraying along the edges of the belt.
• Glazed or Shiny Appearance: A glazed or shiny appearance on the belt surface can indicate slippage.
• Loss of Power to Accessories: Dimming headlights, a hot engine (due to a failing water pump), or an unresponsive power steering system can all be symptoms of a slipping or broken belt.
• Complete Breakdown: A broken belt will lead to a complete loss of power to all belt-driven accessories, potentially leaving you stranded.

Signs of a Failing Automatic Tensioner:

• Abnormal Noises: A failing tensioner may produce rattling, clunking, or grinding noises, especially at idle.
• Excessive Belt Vibrations: If the tensioner isn't holding proper tension, the belt may vibrate excessively.
• Belt Slippage: If the tensioner spring weakens, it won't apply enough force, leading to belt slippage and the associated squealing noises.
• Misalignment: A failing tensioner can sometimes lead to belt misalignment, causing uneven wear on the belt and pulleys.
• Visible Movement: While the engine is running, observe the tensioner. Excessive bouncing or wobbling of the tensioner arm can indicate a failing unit.

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