2015 Ford F-350 Super Duty Serpentine Belt Routing & Replacement

Quick Answer

For the 2015 Ford F-350 Super Duty with the 6.7L Power Stroke diesel engine, here's what you need to know:

• Belt Length: Approximately 2320 mm (91.3 inches)
• Rib Count: 6-rib
• OEM Belt PN: FC3Z-8620-E
• Aftermarket Cross-references:
  • Gates: K060913
  • Dayco: 5060913
  • Continental Elite: 4060913
• Auto-Tensioner PN: FC3Z-6B209-A
• Idler Pulley PN: BC3Z-6C348-A

(Note: These part numbers are for the 6.7L Power Stroke diesel engine. Part numbers may vary for other engine options. Always verify compatibility with your specific vehicle before purchasing.)

Belt Routing

The serpentine belt on your 2015 Ford F-350 Super Duty (6.7L Power Stroke diesel) weaves its way around several critical components. Before you begin any removal, always take a clear photograph of the existing belt routing. This will be your best guide during reinstallation.

Here's a typical routing path, starting from the crankshaft pulley:

1. Crankshaft Pulley: The belt starts at the lowest, largest pulley – the crankshaft pulley, which powers all other accessories.
2. A/C Compressor: From the crankshaft, the belt typically goes up to the air conditioning compressor pulley.
3. Idler Pulley: Next, it will often route over or under an idler pulley, which helps guide the belt and maintain tension.
4. Alternator: The belt then proceeds to the alternator pulley, which charges your battery and powers electrical systems.
5. Power Steering Pump: From the alternator, it moves to the power steering pump pulley, assisting your steering.
6. Water Pump: The belt then typically wraps around the water pump pulley, which circulates coolant through your engine.
7. Automatic Tensioner: Finally, the belt usually comes to rest against the automatic tensioner pulley, which maintains proper belt tension.

Remember, subtle variations can exist. Your photo is your most reliable reference.

How to Replace the Serpentine Belt

Replacing a serpentine belt is a manageable DIY task for many, but proper tools and caution are essential.

1. Safety First: Ensure the engine is off and cool. Disconnect the negative battery terminal to prevent accidental starting.
2. Locate the Tensioner: Identify the automatic belt tensioner. It will have a square opening, usually 3/8-inch or 1/2-inch, designed for a breaker bar or a specialized serpentine belt tool.
3. Relieve Tension: Insert your serpentine belt tool or breaker bar into the tensioner's square opening. Apply pressure (usually turning clockwise or counter-clockwise, depending on the design) to rotate the tensioner arm and relieve tension on the belt. Be careful not to damage the tensioner. If you are unsure, consult a repair manual or a professional.
4. Remove the Old Belt: While holding the tensioner in the loosened position, slip the belt off one of the pulleys (often the idler pulley is easiest). Once it's off, slowly release the tensioner.
5. Inspect Pulleys: Before installing the new belt, inspect all pulleys for any damage, wobbling, or excessive noise when spun by hand. Also, check for any oil or fluid leaks that might contaminate the new belt.
6. Route the New Belt: Referring to your photograph or the routing diagram, carefully route the new belt around all the pulleys, leaving the automatic tensioner pulley for last or using it as the final point to slip the belt on.
7. Tension the Belt: Once the belt is mostly in place, use your serpentine belt tool or breaker bar to again relieve the tensioner and slip the belt fully onto the tensioner pulley. Slowly release the tensioner to allow it to apply proper tension to the new belt.
8. Double-Check: Ensure the belt is properly seated in all pulley grooves and that no part of the belt is off-track. Reconnect the battery terminal. Start the engine briefly and listen for any unusual noises. Turn the engine off and re-check the belt's seating.

Replacement Interval

Typically, serpentine belts are recommended for inspection every 30,000 to 50,000 miles and replacement every 60,000 to 100,000 miles, or sooner if signs of wear are present. However, always refer to your F-350's owner's manual for the most accurate manufacturer-recommended service intervals for your specific model and engine.

Signs of a Failing Belt or Tensioner

Ignoring a failing serpentine belt or tensioner can lead to inconvenient breakdowns and potentially more serious engine damage. Watch out for these warning signs:

• Squealing or Chirping Noises: This is one of the most common indicators of a worn or improperly tensioned belt. The noise often intensifies upon starting, during wet weather, or when accessories like the A/C are engaged.
• Cracks, Fraying, or Glazing: Visually inspect the belt's ribbed surface. Cracks, split ribs, missing chunks, or a shiny, glazed appearance are all signs that the belt is past its prime.
• Loss of Power Steering: A failing belt can lead to a loss of power assistance to your steering, making it much harder to turn the wheel.
• Overheating Engine: If the belt drives the water pump, a broken or slipping belt will cause the engine to overheat due to a lack of coolant circulation.
• Battery Not Charging / Dim Lights: A failing belt may prevent the alternator from spinning correctly, leading to your battery not charging and dimming headlights or interior lights.
• Accessory Malfunction: Any accessory driven by the serpentine belt (A/C, power steering, etc.) might simply stop working or perform poorly.
• Tensioner Issues:
  • Worn Pulley Bearings: A failing tensioner often has noisy or seized bearings in its pulley.
  • Weak Spring: The tensioner's spring can weaken over time, leading to insufficient belt tension and allowing the belt to slip.
  • Excessive Vibration/Movement: If the tensioner arm is visibly vibrating excessively while the engine is running, it may be failing.

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