2016 Honda Odyssey Serpentine Belt Guide: Routing, Part Numbers, and Replacement

Quick Answer

• Belt Length: Varies by engine option (see below)
• Rib Count: 7-rib
• OEM Belt Part Number: Varies by engine option (verify with Honda parts supplier)
• Aftermarket Cross-references:
  • Gates K070820 (for 3.5L V6 J35Y6 engine)
  • Dayco 5070820 (for 3.5L V6 J35Y6 engine)
  • Continental Elite 4070820 (for 3.5L V6 J35Y6 engine)
• Auto-Tensioner Part Number: Varies by engine option (verify with Honda parts supplier)
• Idler Pulley Part Number: Varies by engine option (verify with Honda parts supplier)

Belt Routing

Before you begin any work, it is crucial to photograph your existing serpentine belt routing from multiple angles. This will provide an invaluable reference during reassembly.

The 2016 Honda Odyssey typically comes with a 3.5L V6 engine (J35Y6). The serpentine belt routing for this engine generally follows this path:

1. Starting from the crankshaft pulley (the lowest, largest pulley at the front of the engine).
2. The belt travels upwards to the A/C compressor pulley (usually on the lower passenger side).
3. From the A/C compressor, the belt routes over an idler pulley (a smooth pulley that guides the belt).
4. The belt then goes down and around the alternator pulley (typically located higher up on the engine, charging the battery).
5. After the alternator, the belt wraps around the power steering pump pulley (usually near the top of the engine, assisting steering).
6. From the power steering pump, the belt continues to the water pump pulley (circulating coolant).
7. Finally, the belt runs to the automatic tensioner pulley (a spring-loaded pulley that maintains proper belt tension) before returning to the crankshaft pulley.

Always confirm the exact routing for your specific vehicle configuration. Some models may have slight variations based on trim level or specific options.

How to Replace the Serpentine Belt

Replacing the serpentine belt on your 2016 Honda Odyssey is a manageable task for the DIY enthusiast with the right tools.

1. Safety First: Ensure the engine is off and cool. Disconnect the negative battery terminal to prevent accidental starting.
2. Locate the Tensioner: Identify the automatic serpentine belt tensioner. It will have a square opening, typically 3/8-inch, designed for a breaker bar or a specialized serpentine belt tool.
3. Relieve Tension: Insert a 3/8-inch breaker bar or serpentine belt tool into the square opening of the tensioner. Rotate the tensioner clockwise (or counter-clockwise, depending on the engine) to relieve the tension on the belt. This will allow you to slip the belt off the pulleys.
4. Remove the Old Belt: Once tension is relieved, carefully remove the belt from one of the easier-to-reach pulleys (like an idler pulley or the alternator pulley).
5. Inspect Pulleys: While the belt is off, inspect all pulleys for any signs of wear, wobbling, or excessive noise when spun by hand. Also, check for any oil leaks or debris that could damage the new belt.
6. Route the New Belt: Referring to your photographed routing, carefully route the new belt around all pulleys, leaving the tensioner pulley or an easily accessible idler pulley for last.
7. Apply Tension: Once the belt is mostly routed, use your breaker bar or serpentine belt tool to once again relieve tension on the tensioner. Slip the new belt over the final pulley.
8. Verify Routing: Slowly release the tensioner and ensure the belt is properly seated in all pulley grooves. Double-check your routing against your photos.
9. Reconnect Battery & Test: Reconnect the negative battery terminal. Start the engine and let it run for a few minutes, observing the belt for proper operation, alignment, and any unusual noises. Turn off the engine and re-check the belt tension and seating after a short drive.

Replacement Interval

Honda typically recommends inspecting the serpentine belt at every oil change and replacing it if it shows any signs of wear or damage. Generally, a serpentine belt on a 2016 Honda Odyssey can last anywhere from 50,000 to 100,000 miles, but this can vary greatly depending on driving conditions, climate, and engine load. Always refer to your owner's manual for specific maintenance schedules.

Signs of a Failing Belt or Tensioner

Being aware of the symptoms of a failing serpentine belt or tensioner can save you from being stranded and prevent further damage to critical engine components.

Failing Serpentine Belt:

• Squealing or Chirping Noises: This is the most common sign. It often indicates a loose, worn, or misaligned belt.
• Cracks or Fraying: Visible cracks, missing ribs, or fraying along the edges of the belt are clear indicators it needs replacement.
• Glazed or Shiny Appearance: A glossy appearance on the ribs of the belt suggests it's slipping.
• Loss of Power Steering, A/C, or Charging: If the belt breaks or slips severely, you'll lose power to these accessories.

Failing Belt Tensioner:

• Belt Squeal That Doesn't Go Away: If you've replaced the belt and the squealing persists, the tensioner might be the culprit.
• Wobbling Pulley: Observe the tensioner pulley while the engine is running. If it's wobbling excessively, the bearing is likely failing.
• Grinding or Growling Noise: A failing tensioner bearing can produce these types of noises.
• Incorrect Belt Tension: An old or weak tensioner spring may not maintain proper tension, leading to belt slip or premature belt wear.

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