2018 Nissan Frontier Serpentine Belt Routing & Part Numbers

Quick Answer

For the 2018 Nissan Frontier, the serpentine belt system can vary based on the engine. Most models will use a 6-rib belt.

• Belt Length (Varies by engine): Typically around 81.5 inches to 82 inches (for 4.0L V6) or 80.5 inches to 81 inches (for 2.5L I4). Always verify with your specific engine and VIN.
• Rib Count: 6-rib
• OEM Belt Part Number (Varies by engine):
  • 4.0L V6: Nissan PN 11720-EA20A
  • 2.5L I4: Nissan PN 11720-3AA0A
• Aftermarket Cross-References (4.0L V6):
  • Gates K060815
  • Dayco 5060815
  • Continental Elite 4060815
• Aftermarket Cross-References (2.5L I4):
  • Gates K060805
  • Dayco 5060805
  • Continental Elite 4060805
• Auto-Tensioner Part Number (Varies by engine):
  • 4.0L V6: Nissan PN 11750-EA20A
  • 2.5L I4: Nissan PN 11750-3SA0A
• Idler Pulley Part Number (Varies by engine):
  • 4.0L V6: Nissan PN 11925-EA200
  • 2.5L I4: Nissan PN 11925-JA10A

Belt Routing

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

For the 2018 Nissan Frontier (both 2.5L and 4.0L engines typically follow a similar path):

1. Start at the Crankshaft Pulley (the large pulley at the bottom, closest to the front of the engine).
2. From the crankshaft, the belt typically goes up and to the right to the A/C Compressor Pulley.
3. From the A/C compressor, the belt routes over and possibly around an idler pulley (if applicable for your engine configuration).
4. The belt then typically goes up and to the left to the Alternator Pulley.
5. From the alternator, it may route down to the Power Steering Pump Pulley.
6. The belt path continues to the Water Pump Pulley, which is usually positioned near the top of the engine.
7. Finally, the belt routes to the Automatic Tensioner Pulley, which provides the necessary tension to keep the belt snug.

Note: The exact routing can vary slightly based on specific engine options and accessories. Always refer to your vehicle's service manual or the diagram often found under the hood.

How to Replace the Serpentine Belt

Replacing the serpentine belt on your 2018 Nissan Frontier is a job that most DIY mechanics can tackle. You'll need a serpentine belt tensioner tool or a 3/8-inch breaker bar, as well as a new belt.

1. Locate the tensioner: Identify the automatic tensioner pulley. It will have a square opening, typically 3/8-inch, where you can insert your tool.
2. Relieve tension: Insert your serpentine belt tool or breaker bar into the square opening on the tensioner. Rotate the tensioner to relieve tension on the belt. This will allow you to slip the belt off the pulleys.
3. Remove the old belt: Carefully remove the old belt from all the pulleys, noting its path (even if you took a photo, it helps to mentally retrace).
4. Install the new belt: Route the new belt around all the pulleys according to the diagram or your photograph. Leave the automatic tensioner pulley as the last one you route the belt around, or leave an easily accessible pulley free.
5. Tension the belt: Again, using your tool, rotate the automatic tensioner to create slack. Slip the belt onto the final pulley. Slowly release the tensioner, ensuring the belt is properly seated in all the pulley grooves.
6. Double-check: Once the belt is on, visually inspect all pulleys to ensure the belt is correctly aligned and seated in all the grooves. Start the engine briefly and listen for any unusual noises. Turn the engine off and re-check the belt alignment.

Replacement Interval

Serpentine belts are wear items and generally need to be replaced periodically. For most 2018 Nissan Frontier models, it's recommended to inspect the belt every 30,000 miles and consider replacement every 60,000 to 100,000 miles, or every 5-7 years, whichever comes first. However, severe driving conditions (extreme heat/cold, dusty environments) can shorten its lifespan. Always refer to your owner's manual for the most accurate service intervals.

Signs of a Failing Belt or Tensioner

Ignoring a failing serpentine belt or tensioner can lead to significant problems, as these components drive crucial accessories like the alternator, power steering pump, and A/C compressor.

Signs of a failing serpentine belt:

• Squealing or chirping noises: This is often the most common sign, especially on cold starts or when turning the steering wheel.
• Cracks or fraying: Visible cracks, splits, or frayed edges on the belt indicate it's nearing the end of its life.
• Glazed or shiny appearance: A glazed belt can lose its grip and slip.
• Loss of power to accessories: If the belt slips or breaks, you'll notice issues with power steering, charging system (battery light on), or air conditioning.
• Engine overheating: A broken water pump belt (driven by the serpentine belt) can lead to engine overheating.

Signs of a failing automatic tensioner:

• Excessive belt vibration or flapping: A weak tensioner won't keep the belt taut.
• Squealing or rattling noises: These can come directly from a worn tensioner bearing.
• Visible misalignment: The tensioner pulley may not be perfectly aligned with other pulleys.
• "Play" in the pulley: If you can easily move the tensioner pulley by hand, its bearing may be worn.
• Belt slipping: Even with a good belt, a bad tensioner will allow the belt to slip.

If you notice any of these symptoms, it's best to have your serpentine belt system inspected by a qualified technician as soon as possible.

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