2017 Ford F-250 Super Duty Serpentine Belt

Quick answer

• Engine: 6.2L V8

• Belt Length: 101.89 inches

• Rib Count: 6-rib

• OEM Belt Part Number: GC3Z-8620-B

• Aftermarket Cross-References: Gates K061014, Dayco 5061015, Continental 4061014

• Auto-Tensioner Part Number: Motorcraft BT-120

• Idler Pulley Part Number: Motorcraft YS-421

• Engine: 6.7L Power Stroke Diesel V8

• Dual Alternators: Yes

• Belt Length: 94.41 inches

• Rib Count: 8-rib

• OEM Belt Part Number: HC3Z-8620-C

• Aftermarket Cross-References: Gates K080938, Dayco 5080940, Continental 4080938

• Auto-Tensioner Part Number: Motorcraft BT-118

• Idler Pulley Part Number: Motorcraft YS-413

Belt routing

Before removing the old belt, we strongly recommend taking a clear photograph of the belt's path for reference.

6.2L V8 Engine

The belt starts at the crank pulley, moves up to the A/C compressor, down and around the idler pulley, up to the alternator, down to the power steering pump, across the water pump, and finally back to the tensioner.

6.7L Power Stroke Diesel V8 Engine

With the dual alternator setup, the path is as follows: from the crank pulley, the belt goes to the A/C compressor, then to the idler pulley, up to the top alternator, down to the power steering pump, across the water pump, and then to the tensioner.

How to replace the serpentine belt

To replace the serpentine belt, you will need a serpentine belt tool or a 3/8" breaker bar. Locate the auto-tensioner and insert the tool into the designated square hole. Rotate the tensioner to release the tension on the belt, and then slip the belt off the pulleys.

When installing the new belt, refer to your photograph or the routing description to ensure it is correctly routed. Once the belt is in place on all pulleys except the tensioner, release the tensioner to tighten the belt. Double-check that the belt is properly seated in all the pulley grooves.

Replacement interval

For the 2017 Ford F-250 Super Duty, it is recommended to inspect the serpentine belt at every oil change and replace it every 60,000 to 100,000 miles, or as needed based on its condition.

Signs of a failing belt or tensioner

• Squealing or chirping noises: This is often the first sign of a worn belt or a failing tensioner.
• Visible wear on the belt: Look for cracks, fraying, or glazing on the belt.
• Tensioner pulley noise: A grinding or rattling noise from the tensioner indicates a bad bearing.
• Reduced performance: A slipping belt can cause issues with the alternator, power steering, and A/C.

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