This procedure covers the removal and replacement of the serpentine belt on the 2014-2019 Toyota Corolla 1.8L I4 engine, including inspection of all pulleys and tensioner components.

Warnings

Tools required

Parts

• Serpentine belt × 1 — Use OEM specification - verify length and part number for your specific model year

Preparation

1. Ensure engine is completely cool to the touch
2. Park vehicle on level surface and engage parking brake
3. Document or photograph the belt routing diagram on the radiator support or engine bay. If no diagram is present, take clear photos of the belt path from multiple angles
4. Verify you have the correct replacement belt by comparing length and part number

Procedure

1. 1

   Access the engine bay
   Open the hood and secure it with the prop rod. Locate the serpentine belt at the front of the engine. The belt tensioner is positioned on the upper right side of the engine and can be identified by its smooth pulley with a 14mm bolt head in the center.
2. 2

   Inspect current belt routing
   Carefully verify the current belt routing matches your documentation. The belt should wrap around the crankshaft pulley, water pump, alternator, A/C compressor, and tensioner pulley. Note any deviations from the expected routing diagram.
3. 3

   Release belt tension
   Using a 14mm socket on a breaker bar or serpentine belt tool, insert it into the square or hex opening on the belt tensioner arm. Rotate the tensioner clockwise (toward the passenger side) to release tension. The tensioner will move approximately 45-60 degrees. Maintain steady pressure throughout this step.
   ⚠The tensioner has significant spring tension. Do not release the tool suddenly or allow it to snap back uncontrolled.
4. 4

   Remove the old belt
   While holding the tensioner in the released position, slip the belt off the tensioner pulley first, then carefully guide it off the alternator pulley. Slowly release the tensioner back to its resting position. Remove the belt from the remaining pulleys and extract it from the engine bay.
5. 5

   Inspect pulleys and tensioner
   With the belt removed, manually spin each pulley to check for bearing noise, rough rotation, or excessive play. Inspect the tensioner arm for smooth movement through its full range of motion. Check all pulley surfaces for wear grooves, damage, or debris. Replace any components showing wear or damage before installing the new belt.
6. 6

   Route the new belt
   Beginning with the crankshaft pulley at the bottom, route the new belt around all pulleys EXCEPT the tensioner pulley, following your documented routing diagram. Typical routing is: crankshaft → water pump → alternator → A/C compressor → tensioner (last). Ensure the belt ribs are properly seated in each pulley groove.
7. 7

   Install belt on tensioner
   Using the 14mm tool, rotate the tensioner clockwise again to create slack. Guide the belt onto the tensioner pulley, ensuring proper rib alignment. Carefully release the tensioner, allowing it to apply proper tension to the belt. Verify the belt is centered on all pulleys.
8. 8

   Verify installation
   Double-check that the belt is properly seated in all pulley grooves with no twists or misalignment. The belt should sit centered on each pulley with ribs fully engaged. Manually rotate the crankshaft clockwise two complete revolutions by turning the center crankshaft bolt to confirm the belt tracks properly and does not slip off any pulley.

Reassembly

1. No disassembly was required for this procedure
2. Ensure all tools are removed from the engine bay before closing the hood

Verification

• Start the engine and observe the belt operation for 30-60 seconds. Listen for any squealing, chirping, or abnormal noises
• Verify the belt remains centered on all pulleys during operation and does not slip or flutter
• Check that all accessories (alternator, A/C compressor) are functioning normally
• After the first 100-200 miles of driving, visually reinspect the belt for proper tracking and tension

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