2015 Toyota Camry Serpentine Belt Guide

Quick Answer

• 2.5L I4 (2AR-FE Engine):

  • Belt Length: ~2425mm (95.5")
  • Rib Count: 7
  • OEM Belt Part Number: 90916-02708
  • Aftermarket Cross-References: Gates K070955, Dayco 5070955, Continental 4070955
  • Auto-Tensioner Assembly: 16620-36013
  • Idler Pulley (smooth): 16604-36011

• 3.5L V6 (2GR-FE Engine):

  • Belt Length: ~1921mm (75.6")
  • Rib Count: 6
  • OEM Belt Part Number: 90916-A2015
  • Aftermarket Cross-References: Gates K060756, Dayco 5060755, Continental 4060756
  • Auto-Tensioner Assembly: 16620-31021
  • Idler Pulley (upper, grooved): 16603-31040

Belt Routing

Before you remove the old serpentine belt, always take a clear photograph of the belt's path or sketch a diagram. This will be your best guide for installation.

2.5L I4 Engine Belt Routing

The belt snakes around seven pulleys. Starting from the bottom-most pulley, the crankshaft:

1. The inside (grooved) face of the belt wraps around the Crankshaft Pulley.
2. Goes up to the A/C Compressor.
3. Travels to the smooth Idler Pulley where the outside (smooth) face makes contact.
4. Wraps under and around the Alternator.
5. Crosses to the Power Steering Pump.
6. Goes down to the Water Pump.
7. Finally, loops around the Tensioner Pulley before returning to the crankshaft.

3.5L V6 Engine Belt Routing

The V6 uses a more compact layout with six pulleys:

1. Starting from the Crankshaft Pulley at the bottom.
2. The belt moves up to the A/C Compressor.
3. Then up to the Alternator.
4. Wraps over the top grooved Idler Pulley.
5. Goes down to the Water Pump.
6. Finally, the smooth back of the belt presses against the Tensioner Pulley, which applies pressure to the system.

How to Replace the Serpentine Belt

Replacing the serpentine belt is a common maintenance item for the DIYer. You will need a serpentine belt tool, which is a long, thin bar with various socket attachments, or a standard 3/8" or 1/2" drive breaker bar.

For both the 4-cylinder and V6 engines, locate the automatic belt tensioner. It is a spring-loaded pulley designed to keep constant pressure on the belt. You will see a hex-shaped lug or cast hole on the body of the tensioner designed for your tool.

1. Fit your serpentine belt tool or breaker bar onto the tensioner.
2. Rotate the tensioner to release pressure from the belt. This will require some force.
3. While holding the tensioner, slip the old belt off one of the pulleys (the highest, smoothest pulley is often easiest).
4. Gently release the tensioner.
5. Remove the old belt completely.
6. Consult your photo or diagram and carefully route the new belt around all pulleys, leaving the tensioner or a smooth idler for last.
7. Apply force to the tensioner again and slip the new belt onto the final pulley.
8. Slowly release the tensioner, making sure the belt seats correctly in the grooves of every pulley.
9. Double-check your routing and alignment. The belt ribs must be perfectly centered in each ribbed pulley.

Replacement Interval

Toyota does not specify a strict mileage or time interval for serpentine belt replacement. Instead, the belt is "inspect and replace as needed." As a general rule of thumb, it's wise to inspect the belt during every oil change and plan for replacement every 60,000 to 100,000 miles. Factors like climate (extreme heat or cold) can shorten the belt's lifespan.

Signs of a Failing Belt or Tensioner

Listen to your vehicle and look at the components. They will often tell you when they're wearing out.

• Squealing or Chirping: A high-pitched squeal, especially on startup or when the A/C is turned on, is a classic sign of a worn or misaligned belt.
• Visible Wear: Look for cracks, fraying, missing ribs, or a glazed, shiny appearance on the belt.
• Tensioner Noise: A grinding or rattling noise coming from the front of the engine could be a failing bearing in the tensioner or idler pulley.
• "Chattering" Belt: If you see the belt vibrating or flapping excessively while the engine is running, the tensioner spring is likely weak and failing to provide adequate pressure.
• Accessory Problems: A failing belt can cause intermittent issues with the alternator (dimming lights, battery warning), power steering (difficulty turning), or A/C.

If you're not comfortable tackling this job yourself, Repairius can help you find a qualified mechanic in your area.

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