2019 International MV Serpentine Belt Routing & Part Numbers

Quick Answer

• Belt Length: 2150 mm (84.6 inches)
• Rib Count: 8-rib
• OEM Belt Part Number: 3694065C1 (This may vary depending on specific engine configuration. Always verify with your International dealer.)
• Aftermarket Cross-references:
  • Gates K080846
  • Dayco 5080846
  • Continental Elite 4080846
• Auto-Tensioner Part Number: Verify with your International dealer based on your specific engine. (PNs vary greatly depending on engine and accessories.)
• Idler Pulley Part Number: Verify with your International dealer based on your specific engine. (PNs vary greatly depending on engine and accessories.)

Belt Routing

The 2019 International MV utilizes an 8-rib serpentine belt system. Before you begin any work, always take a clear photo of the current belt routing! This will be an invaluable reference during reinstallation, as minor variations can occur.

Here's a generalized routing path for the 2019 International MV engine. Please note that exact accessory locations and order may vary slightly based on the specific engine (e.g., Cummins B6.7 or L9) and installed options (e.g., extreme-duty alternators, multiple A/C compressors).

1. Begin at the crankshaft pulley at the bottom front of the engine, ensuring the belt is seated in all grooves.
2. From the crankshaft pulley, the belt typically routes upward to the A/C compressor pulley (if equipped). The belt will usually ride over the top of this pulley.
3. After the A/C compressor, the belt will then continue to an idler pulley. This pulley helps guide the belt and maintain proper tension. Depending on the engine, there might be multiple idler pulleys.
4. From the idler pulley, the belt then routes up to the alternator pulley. The belt will ride over the top of the alternator pulley.
5. Next, the belt typically goes to the power steering pump pulley. It will wrap around this pulley, often from the bottom or side.
6. Following the power steering pump, the belt usually goes to the water pump pulley, which is critical for engine cooling. It typically wraps around this pulley.
7. Finally, the belt routes to the automatic tensioner pulley. The tensioner will have a square drive (typically 1/2" or 3/8") for a breaker bar or serpentine belt tool. The belt will pass under or over the tensioner pulley, depending on the design, with the tensioner applying constant pressure to maintain optimal belt tension.

How to Replace the Serpentine Belt

Replacing the serpentine belt on a 2019 International MV requires some basic tools and attention to detail. Always refer to your vehicle's service manual for specific instructions for your engine variant.

1. Safety First: Ensure the engine is off and cool. Disconnect the negative battery terminal to prevent accidental starts.
2. Document Routing: As mentioned, take a clear photo or draw a diagram of the existing belt's routing before removal.
3. Relieve Tension: Locate the automatic belt tensioner. It will have a square opening for a ratchet or serpentine belt tool. Insert a 3/8" or 1/2" breaker bar or the specialized serpentine belt tool into this opening. Rotate the tensioner to relieve tension on the belt and hold it in that position. Some tensioners have a pin or bolt you can insert to hold them in the relieved position.
4. Remove Old Belt: While holding the tensioner open, carefully slip the old belt off one of the pulleys (usually the easiest one to access, like an idler pulley).
5. Inspect Pulleys: With the belt removed, inspect all pulleys for wear, damage, or excessive play. Spin each pulley by hand; it should turn smoothly without noise or wobble. Check idler and tensioner pulleys specifically, as bad bearings in these components are common causes of belt issues.
6. Route New Belt: Begin routing the new belt according to your diagram, leaving the tensioner pulley for last. Ensure the belt is properly seated in all the grooves of every pulley.
7. Apply Tension: Once the belt is routed around all other pulleys, use your breaker bar or serpentine belt tool to once again relieve the tensioner. Slip the new belt over the tensioner pulley. Slowly release the tensioner, allowing it to apply pressure to the new belt.
8. Verify Routing: Double-check that the belt is correctly seated on all pulleys and that the routing matches your diagram or photo.
9. Reconnect Battery: Reconnect the negative battery terminal.
10. Test Run: Start the engine and let it run for a few minutes. Listen for any squealing, chirping, or unusual noises. Turn off the engine and re-check the belt routing and tension.

Replacement Interval

For heavy-duty applications like the International MV, serpentine belts are designed for durability. However, they are wear items. It's generally recommended to inspect the serpentine belt at every service interval (e.g., every 15,000 to 30,000 miles or annually) and replace it preventatively around 60,000 to 100,000 miles, or every 4-5 years, whichever comes first. Refer to your International Owner's Manual or service schedule for the most precise recommendations for your specific model and engine.

Signs of a Failing Belt or Tensioner

Ignoring a failing serpentine belt or tensioner can lead to a breakdown, as it drives critical components. Here are the warning signs:

• Squealing or Chirping Noises: This is the most common sign. A loose, worn, or glazed belt will often squeal, especially on cold starts, during acceleration, or when accessories like the A/C are engaged. A failing tensioner can also cause these noises.
• Visible Cracks, Fraying, or Missing Ribs: Conduct a visual inspection of the belt. Look for small cracks across the ribs (not lengthwise), fraying along the edges, or sections where ribs are missing or damaged. These indicate the belt is losing integrity.
• Glazed or Shiny Belt Surface: A belt that appears shiny or glazed on the ribbed side indicates it's hardened and losing its grip, leading to slippage.
• Power Steering or A/C Malfunction: If the belt slips or breaks, components like the power steering pump and A/C compressor will stop working, leading to heavy steering or no cold air.
• Battery Light On/Charging Issues: The alternator, which charges the battery, is driven by the serpentine belt. If the belt fails, the alternator stops producing power, and the battery warning light will illuminate.
• Engine Overheating: The water pump, vital for circulating coolant, is also belt-driven. A broken belt will lead to rapid engine overheating.
• Wobbling or Misaligned Pulleys: Inspect the pulleys while the engine is running (with extreme caution). A wobbling tensioner pulley or any other pulley indicates a worn bearing and needs immediate attention.
• Excessive Vibration: A bad tensioner or a severely worn belt can cause undue vibration in the belt system.

If you notice any of these signs, have your serpentine belt system inspected and repaired promptly.

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