Serpentine Belt Tensioner

This procedure covers removal and replacement of the serpentine belt tensioner assembly on the 2018-2024 Toyota Camry 2.5L I4 engine, including belt removal and reinstallation.

Warnings

Tools required

Parts

• Serpentine belt tensioner assembly × 1 — Use OEM specification
• Serpentine belt (if worn or damaged) × 1 — Use OEM specification

Preparation

1. Ensure engine is completely cool to the touch
2. Park vehicle on level surface and engage parking brake
3. Open hood and secure with prop rod
4. Photograph or sketch the serpentine belt routing path before removal
5. Verify belt routing diagram is visible on radiator support or fan shroud
6. Locate the belt tensioner on the right side of the engine (when facing the vehicle)

Procedure

1. 1

   Remove engine cover if equipped
   Some 2018-2024 Camry models have a plastic engine cover. If present, grasp firmly and pull upward to release the mounting grommets. Set aside in a clean area.
2. 2

   Relieve belt tension and remove serpentine belt
   Locate the tensioner pulley on the upper right side of the engine. Insert a 3/8" breaker bar or belt tool into the square 3/8" drive hole on the tensioner arm. Rotate the tensioner clockwise (toward the front of the vehicle) to relieve tension. While holding tension, slide the belt off the tensioner pulley first, then release the tensioner slowly. Remove the belt from all remaining pulleys following your documented routing.
   ⚠Control the tensioner arm when releasing - do not allow it to snap back as this can damage the tensioner or cause injury.
3. 3

   Inspect belt condition
   Examine the removed belt for cracks, glazing, missing ribs, or contamination from oil or coolant. Check belt edges for fraying. Replace the belt if any damage is visible or if it shows signs of wear. Even if replacing only the tensioner, consider belt replacement if the vehicle has over 60,000 miles.
4. 4

   Remove tensioner mounting bolt
   Using a 14mm socket with extension, remove the single bolt securing the tensioner assembly to the engine block. The bolt is accessed from above and threads directly into the engine block. Keep the bolt in a clean location for reinstallation or replacement.
   ℹ️The tensioner bolt threads into the aluminum engine block. Avoid cross-threading during reinstallation.
5. 5

   Remove tensioner assembly
   Pull the tensioner assembly straight out from the engine block. The tensioner locates on a dowel pin or machined surface. If resistance is encountered, gently wiggle the tensioner while pulling outward. Do not pry against the engine block or use excessive force.
6. 6

   Clean mounting surface
   Use a clean shop towel to wipe the tensioner mounting surface on the engine block. Remove any dirt, oil residue, or corrosion. Inspect the mounting surface for damage or cracks. Verify the locating dowel pin is present and not damaged.
7. 7

   Install new tensioner assembly
   Align the new tensioner with the locating dowel pin or mounting surface on the engine block. Push the tensioner firmly into position ensuring it seats completely flush against the engine block. Thread the mounting bolt by hand to verify proper thread engagement.
   ⚠Ensure the tensioner is fully seated before tightening the bolt to prevent misalignment and premature failure.
8. 8

   Torque tensioner mounting bolt
   Using a torque wrench and 14mm socket, tighten the tensioner mounting bolt to specification. Apply torque in a smooth, steady motion without jerking. Verify the tensioner remains flush against the engine block after torquing.
   Torque spec

   Belt Tensioner Bolt55 Nm (41 lb-ft)
9. 9

   Route serpentine belt
   Following your documentation or the underhood routing diagram, route the new or existing serpentine belt around all pulleys EXCEPT the tensioner pulley. Typical routing is: crankshaft, A/C compressor, alternator, idler pulley, water pump. Ensure the belt ribs properly seat in all pulley grooves.
   ⚠Verify the belt is seated correctly in all pulley grooves before applying tensioner pressure. An improperly routed belt can cause engine damage or belt failure.
10. 10

    Install belt on tensioner pulley
    Insert the breaker bar or belt tool into the tensioner arm and rotate clockwise to create slack. Route the belt over the tensioner pulley, ensuring the ribs are properly seated in the pulley grooves. Slowly release the tensioner to apply proper tension to the belt. Remove the tool.
11. 11

    Verify belt installation
    Visually inspect all pulleys to confirm the belt is properly seated with ribs fully engaged in each pulley groove. The belt should run straight and true without misalignment. Manually rotate the tensioner arm slightly to verify smooth operation and proper spring tension.

Reassembly

1. Reinstall engine cover if equipped by aligning grommets and pressing down firmly until all clips engage
2. Close hood and remove any tools from engine compartment

Verification

• Start the engine and listen for any squealing, chirping, or unusual noises from the belt area
• Observe the belt operation for 30 seconds to verify smooth rotation without slipping or vibration
• Check that the belt tracks properly in the center of all pulleys without running on edges
• Rev engine to approximately 2000 RPM briefly and verify belt remains stable without slipping or noise
• Shut off engine and perform a final visual inspection of belt alignment and tensioner operation

More procedures for this vehicle