2020 International MV Serpentine Belt Guide

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Quick Answer: 2020 International MV Serpentine Belt Part Numbers

The 2020 International MV is typically equipped with the Cummins B6.7 engine. However, the exact serpentine belt length and part numbers can vary significantly based on the truck's specific configuration, including whether it has air conditioning, the type of alternator installed, and other accessory options. Always verify part numbers using your Vehicle Identification Number (VIN) with a parts supplier or by inspecting the number on the original part.

• Engine: Cummins B6.7
• Belt Rib Count: 8-Rib
• Common Belt Length: Varies; often in the range of 2100mm to 2200mm (approximately 82.5" to 86.5"). Verification is critical.
• OEM Belt Part Number: Varies. Please verify with your International dealer using your VIN.
• Common Aftermarket Belt Cross-References:
  • Gates: K080827 (This is an example part number, please verify length for your application)
  • Dayco: 5080825 (Example part number)
  • Continental: 4080825 (Example part number)
• Automatic Belt Tensioner Assembly Part Number: Varies. Often a Cummins PN. Please verify with a supplier.
• Idler Pulley Part Number: Varies based on position and configuration. Please verify with a supplier.

Belt Routing for 2020 International MV

Correctly routing the serpentine belt is crucial for the proper operation of your engine's accessories. An incorrectly routed belt can cause damage to the components or shred the belt itself.

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

While routing can vary slightly between engine configurations, a common path for the Cummins B6.7 in the MV chassis is as follows:

1. The belt wraps around the main Crankshaft Pulley at the bottom of the engine.
2. From the Crankshaft Pulley, it travels up to the A/C Compressor.
3. From the A/C Compressor, it goes to a smooth Idler Pulley.
4. Next, it routes to the Alternator.
5. From the Alternator, it moves to the Power Steering Pump.
6. It continues to the Water Pump.
7. Finally, it wraps around the Automatic Tensioner pulley before returning to the Crankshaft Pulley. The tensioner is what allows the belt to be removed and installed.

Always double-check that the grooves on the ribbed side of the belt are correctly seated in the grooves of each ribbed pulley (Crank, A/C, Alternator, Power Steering, Water Pump) and that the smooth back of the belt is riding on the smooth pulleys (Idler, Tensioner).

How to Replace the Serpentine Belt

Replacing the belt is a manageable task with the right tool. You will need a serpentine belt tool, which is a long, thin ratchet with various socket and crowfoot attachments, or a standard 3/8" or 1/2" drive breaker bar.

1. Locate the Tensioner: Find the automatic belt tensioner. It's a spring-loaded component with a pulley that applies pressure to the belt. It will have a square 3/8" or 1/2" drive hole in its body or a hex feature on the pulley bolt.
2. Relieve Tension: Insert the breaker bar or serpentine belt tool into the designated hole on the tensioner assembly. Rotate the tensioner against its spring pressure. This will loosen the belt.
3. Remove the Old Belt: While holding the tensioner in the released position, carefully slip the old belt off one of the smooth pulleys, like the idler or tensioner pulley itself.
4. Install the New Belt: Following your photograph or the path described above, route the new belt around all the pulleys, saving one of the easiest-to-access smooth pulleys for last.
5. Finalize Installation: Release the tension on the tensioner tool again, and slip the belt over the final pulley. Slowly release the tool, allowing the tensioner to apply pressure to the new belt. Visually inspect the entire path of the belt one last time to ensure it is seated correctly on every pulley.

Replacement Interval

For a commercial vehicle like the International MV, belts and tensioners should be inspected at every service interval (e.g., every oil change). While modern EPDM belts are durable, there is no fixed mileage replacement interval that fits all operating conditions. A general guideline is to plan for a replacement between 60,000 and 100,000 miles. However, replacement should be based on the belt's actual condition rather than mileage alone.

Signs of a Failing Belt or Tensioner

Paying attention to early warning signs can prevent a breakdown on the road. A failed belt will cause an immediate loss of power steering, alternator charging, and engine cooling, leading to a rapid overheat.

Signs of a bad belt:

• Squealing or Chirping: This often occurs during startup or when the engine is under load.
• Visible Cracks: Look for multiple cracks, especially if they are deep or intersect.
• Glazing: The underside of the belt appears shiny or glossy, indicating it is slipping.
• Fraying or Rib Separation: The edges of the belt are worn, or the ribs are peeling away.

Signs of a bad tensioner or idler pulley:

• Rumbling or Grinding Noise: A bearing inside the tensioner or idler pulley may be failing.
• Excessive Belt Flutter: The belt appears to vibrate or jump around while the engine is running, indicating the tensioner isn't applying smooth, consistent pressure.
• Stiff or "Jerky" Tensioner Movement: When you move the tensioner with a breaker bar, it feels gritty or fails to move smoothly.

If you're replacing a belt that shows signs of premature wear, it is wise to replace the tensioner and idler pulleys at the same time.

If you're not comfortable performing this service yourself, let us help. Find a trusted shop on Repairius. '''