2016 Toyota Tundra Serpentine Belt Routing & Replacement Guide

Quick Answer

• Belt Length: 2100mm (82.7 inches, approximate)
• Rib Count: 7-rib
• OEM Belt PN: 90916-A2002
• Aftermarket Cross-references:
  • Gates K070827
  • Dayco 5070825
  • Continental Elite 4070825
• Auto-Tensioner PN: 16620-0S020
• Idler Pulley PN: 16603-0S010

Belt Routing (5.7L V8 Engine)

Before you begin, always take a clear photograph of your current serpentine belt routing. This will serve as an invaluable reference during reinstallation.

For the 2016 Toyota Tundra with the 5.7L V8 engine, the serpentine belt typically routes as follows:

1. Starting from the crankshaft pulley, the belt travels upward.
2. It then wraps around the A/C compressor pulley (located on the lower passenger side).
3. From the A/C compressor, the belt goes up and over the idler pulley.
4. Next, it descends to wrap around the alternator pulley (usually high on the passenger side).
5. From the alternator, it moves across to the power steering pump pulley (typically on the driver's side, mid-height).
6. The belt then goes down to the water pump pulley.
7. Finally, it loops around the automatic tensioner pulley before returning to the crankshaft pulley, completing the path.

Note: The 4.6L V8 engine may have a slightly different routing pattern. Always consult your vehicle's service manual or confirm with a reliable diagram for your specific engine.

How to Replace the Serpentine Belt

Replacing the serpentine belt on your 2016 Toyota Tundra is a manageable task for most DIYers. Here's a general guide:

1. Safety First: Ensure the engine is off and cool. Disconnect the negative terminal of the battery for added safety.
2. Locate the Tensioner: Identify the automatic belt tensioner. It will have a square opening, typically 3/8-inch, for a breaker bar or a serpentine belt tool.
3. Relieve Tension: Insert a 3/8-inch breaker bar or serpentine belt tool into the square opening on the tensioner. Rotate the tensioner clockwise to release the belt tension. This will allow you to slip the belt off the pulleys.
4. Remove the Old Belt: Carefully remove the old belt from all the pulleys, starting with the easiest ones to access.
5. Route the New Belt: Following your pre-removal photograph or the routing description above, begin routing the new belt around all pulleys, except the tensioner pulley. Make sure the ribs of the belt are properly seated in all pulley grooves.
6. Final Placement: With the belt routed on all other pulleys, use your breaker bar or serpentine belt tool to once again rotate the tensioner clockwise, creating slack. Slip the new belt over the tensioner pulley.
7. Release Tension: Slowly release the tensioner, allowing it to apply pressure to the new belt. Double-check that the belt is correctly seated on all pulleys.
8. Engine Start: Reconnect the battery. Start the engine and let it run for a minute, checking for any unusual noises or wobbling from the belt. Turn the engine off and inspect the belt again to ensure it's still properly aligned.

Replacement Interval

Toyota generally recommends inspecting the serpentine belt every 30,000 miles or 30 months and replacing it if necessary. However, many technicians recommend replacement every 60,000 to 100,000 miles, or sooner if signs of wear are observed. Factors like driving conditions and climate can affect its lifespan.

Signs of a Failing Serpentine Belt or Tensioner

Ignoring a failing serpentine belt or tensioner can lead to serious issues, as these components drive crucial engine accessories. Look out for these warning signs:

• Squealing or Chirping Noises: A common indicator of a worn, glazed, or misaligned belt. It can also point to a failing tensioner or pulley bearing.
• Cracks, Fraying, or Glazing on the Belt: Visually inspect the belt for signs of wear. Deep cracks, missing ribs, or a shiny (glazed) appearance are reasons for replacement.
• Loss of Power Steering, A/C, or Alternator Function: If the belt breaks, these accessories will stop working immediately, leading to a dead battery, overheating, or loss of steering assist.
• Wobbling or Misaligned Pulleys: A failing tensioner or idler pulley can wobble as the engine runs, leading to premature belt wear and noise.
• Belt Slipping: If the belt is slipping due to insufficient tension from a weak tensioner or excessive wear, you might hear a squeal, especially during acceleration or when accessories engage.
• Dashboard Warning Lights: A battery light might illuminate if the alternator isn't charging due to a slipping or broken belt.

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