2017 Volvo VNL Serpentine Belt Routing & Replacement Guide

Quick Answer

• Estimated Belt Length: 2715mm (106.9 inches) - Note: Length can vary slightly based on specific engine configuration. Always verify with your vehicle's engine code.
• Rib Count: 8-rib
• OEM Belt PN (Volvo D13 Engine): 21422774 (Please verify for your specific engine code, as VNLs can have various D11, D13, or Cummins engines.)
• Aftermarket Cross-references:
  • Gates: K081069
  • Dayco: 5081070
  • Continental Elite: 4081069
• Auto Tensioner PN (Volvo D13 Engine): 21066060 (Verify for your engine)
• Idler Pulley PN (Volvo D13 Engine - if applicable): 21870198 (Verify for your engine)

Belt Routing (Volvo D13 Engine)

Before you begin any work, always take a clear photo of your current serpentine belt routing! This will be an invaluable reference during reassembly. The following description is a general routing for a common Volvo D13 engine in a 2017 VNL. Specific routing can vary with different engine options and accessory configurations.

1. Begin at the crankshaft pulley (the large pulley at the bottom, typically powering all other accessories).
2. From the crankshaft, the belt typically goes up to the A/C compressor pulley.
3. From the A/C compressor, the belt then routes to the first idler pulley (a smooth, non-driven pulley used to guide the belt or remove slack).
4. After the idler pulley, the belt usually travels to the alternator pulley (often mounted high on the engine).
5. From the alternator, the belt will route down to the power steering pump pulley.
6. Next, the belt wraps around the water pump pulley.
7. Finally, the belt makes its way to the automatic tensioner pulley, which maintains proper belt tension. The belt will pass under or over this pulley, depending on its specific design, before completing the loop back to the crankshaft pulley.

How to Replace the Serpentine Belt

Replacing the serpentine belt on your 2017 Volvo VNL requires a few tools and some patience. Always ensure the engine is off and cool before starting work.

1. Gather your tools: You will need a serpentine belt tool or a 3/8-inch drive breaker bar (or ratchet) to release the tensioner, and potentially a pry bar or other tools for leverage if needed. You'll also need your new belt.
2. Locate the automatic tensioner: This component typically has a square hole (for a 3/8-inch drive) or a hex head where you can apply leverage.
3. Release tension: Insert your serpentine belt tool or breaker bar into the tensioner's square hole/hex head. Rotate the tensioner to relieve tension on the belt. Be careful, as the tensioner spring is strong.
4. Remove the old belt: While holding the tensioner in the loosened position, carefully slip the belt off one of the pulleys (often the idler or a smooth pulley is easiest).
5. Inspect pulleys: With the old belt removed, take this opportunity to inspect all pulleys for any signs of wear, wobbling, or excessive play. Check for cracks or damage to the automatic tensioner itself.
6. Route the new belt: Refer to the photo you took earlier and the routing diagram above. Carefully route the new belt around all pulleys EXCEPT the last one that you removed the old belt from (often the idler or the tensioner itself).
7. Final installation: With the belt correctly routed on all other pulleys, apply tension to the automatic tensioner again and slip the new belt over the final pulley. Slowly release the tensioner.
8. Double-check: Ensure the belt is properly seated in all pulley grooves and that the tensioner is holding proper tension. Start the engine briefly (watching for fingers!) to confirm the belt runs smoothly and doesn't slip or make unusual noises.

Replacement Interval

For a 2017 Volvo VNL, the serpentine belt typically has a recommended inspection interval of every 60,000 to 100,000 miles or every 4-5 years, whichever comes first. However, heavy-duty truck usage can be demanding, so it's crucial to inspect it more frequently if operating under harsh conditions or if signs of wear are observed. Always refer to your Volvo VNL owner's manual or maintenance schedule for the most accurate and specific recommendations for your particular engine and usage.

Signs of a Failing Belt or Tensioner

Ignoring a failing serpentine belt or tensioner can lead to a breakdown and potential damage to other engine components. Watch out for these common signs:

• Squealing or chirping noises: This is often the most common symptom. It indicates a slipping belt, which can be caused by a worn belt, a faulty tensioner, or misaligned pulleys.
• Cracks, fraying, or glazing on the belt: Visually inspect the belt. Deep cracks, missing chunks, excessive fraying, or a shiny, glazed appearance on the ribbed side indicate wear and a need for replacement.
• Loss of power to accessories: Since the serpentine belt drives components like the alternator, power steering pump, and A/C compressor, a failing belt can lead to dimming headlights (alternator), difficulty steering (power steering), or inefficient air conditioning.
• Engine overheating: The water pump, driven by the serpentine belt, circulates coolant. A failing belt can cause the water pump to stop working effectively, leading to overheating.
• Wobbling or pulsation of the tensioner: Observe the automatic tensioner with the engine running (from a safe distance). Excessive wobbling, vibration, or a pulsating movement indicates a failing tensioner that can no longer maintain proper belt tension.
• Puddles of fluid: If your power steering pump or water pump is leaking, the fluid can contaminate the belt, causing it to slip and wear prematurely.

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