This procedure covers removal and replacement of the alternator drive belt (serpentine belt) on the 2014-2019 Toyota Corolla with 1.8L I4 engine.

Warnings

Tools required

Parts

• Alternator drive belt (serpentine belt) × 1 — Use OEM specification or Gates K060967

Preparation

1. Ensure engine is completely cool to the touch
2. Park vehicle on level ground and engage parking brake
3. Locate the belt routing diagram on the engine bay label or photograph existing belt routing before removal
4. Verify you have the correct replacement belt for your specific model year

Procedure

1. 1

   Access the belt tensioner
   Open the hood and identify the belt tensioner assembly located on the front of the engine. The tensioner is a spring-loaded pulley mechanism positioned between the crankshaft and alternator pulleys. Note the direction the tensioner arm pivots.
2. 2

   Relieve belt tension
   Using a 14mm wrench or breaker bar on the tensioner bolt center, rotate the tensioner clockwise (toward the passenger side) to release tension on the belt. The tensioner will move approximately 45 degrees. Hold the tensioner in this position while removing the belt.
3. 3

   Remove old belt
   While holding the tensioner in the released position, slip the belt off the alternator pulley first, then remove it from the remaining pulleys. Guide the belt out from below the engine compartment. Slowly release the tensioner back to its resting position.
4. 4

   Inspect pulleys and tensioner
   With the belt removed, manually spin each pulley (crankshaft, alternator, tensioner, A/C compressor, and water pump) to check for bearing roughness, noise, or excessive play. Inspect tensioner arm for smooth operation and proper spring tension. Replace any worn components before installing new belt.
5. 5

   Route new belt
   Following the routing diagram, begin installing the new belt starting at the crankshaft pulley, then route it around the water pump, alternator (leaving this off initially), A/C compressor, and tensioner pulleys. Ensure the belt ribs seat properly in each pulley groove.
6. 6

   Install belt on alternator pulley
   Using the 14mm wrench on the tensioner bolt, rotate the tensioner clockwise again to create slack. Route the belt over the alternator pulley, ensuring proper rib engagement. Verify the belt is correctly seated in all pulley grooves before releasing the tensioner.
7. 7

   Release tensioner and verify routing
   Slowly release the tensioner, allowing it to apply proper tension to the belt. Double-check that the belt is correctly seated in all pulley grooves and matches the routing diagram. The belt should sit centered on each pulley without misalignment.

Reassembly

1. No disassembly was required for this procedure
2. Ensure all tools are removed from engine compartment before starting vehicle

Verification

• Start the engine and observe belt operation for 30 seconds, listening for squealing, chirping, or unusual noises
• Verify the belt tracks properly on all pulleys without slipping or walking off center
• With engine running, turn on A/C and electrical loads to verify proper belt tension under load
• Shut off engine and visually reconfirm belt is properly seated on all pulleys
• Check for proper belt tension by pressing firmly on the longest belt span - deflection should be approximately 5-10mm with firm thumb pressure

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