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Toyota RAV4 Serpentine Accesorry Belt Replacement Guide
How to change the serpentine accessory belt on a 2019 to 2023 Toyota RAV4 with the A25A-FKS 2.5L I4 engine.

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2019 RAV4 2.5L I4
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Passenger Side of Engine
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Alternator Pulley - Top
This automotive maintenance tutorial was specifically written to assist owners of the fifth generation (2019, 2020, 2021, 2022 and the updated 2023 model year) Toyota RAV4 SUV equipped with the naturally aspirated A25A-FKS 2.5 liter inline four cylinder in changing the serpentine accessory belt.

Owners of other Toyota and Lexus vehicles such as the Camry, Corolla, Highlander, Prius, Avalon, C-HR, GR86, Venza, Sienna, Sequoia, 4Runner, IS 250, IS 300, IS 350, ES 350, GS 350 and GX 460 may also find these DIY instructions to be helpful.

The OEM (original equipment manufacturer) part number is Toyota 90916-A2027 (or 6PK1150).

Two compatible replacement aftermarket belts with their part numbers are as follows: Goodyear 1060455 and Bando 6PK1150.

The tools needed to complete this procedure include a 14mm socket with a long 3/8" drive ratchet or a breaker bar.

The first two steps are to open the hood and move to the left (passenger) side of the engine bay.



 

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Alternator & Tensioner
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Tensioner Pulley - Middle
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Tensioner False Nut
Take a moment to examine how the old serpentine belt is routed around the pulleys including the crankshaft, air conditioning compressor, alternator and tensioner.

Locate the "false nut" attached to the outer edge of the tensioner assembly.

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Rotate Ratchet Back
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Tension Released
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Slip Belt Off Pulleys
Attach the 14mm socket to a long handled 3/8" ratchet or a breaker bar.

Firmly rotate the ratchet back towards the windshield and the rear of the vehicle to release the tension on the belt.

Hold the ratchet in place with one hand and very carefully slip the old belt off the pulleys with your other hand.

Warning: Do NOT place your fingers or hand in between the belt and any of the pulleys to avoid injuring yourself.

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Old Belt Released
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Lift Belt Out of Engine Bay
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Old OEM Belt Removed
Continue slipping the old belt off the other pulleys.

(Since the RAV4 has electric power steering and an electric coolant or "water" pump, there are only four pulleys.)

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OEM Belt Part Number
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Belt Routing Diagram
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Lower In New Belt
The OEM (original equipment manufacturer) belt was marked with the part numbers Toyota 90916-A2027 - 6PK1150 - V908042 136.

I created a rough belt routing diagram to assist you in installing the new belt.

Keep in mind that the ribbed side of the belt should be wrapped around the ribbed pulleys.

The smooth side of the belt should go against the smooth idler pulley attached to the tensioner assembly.

Carefully lower the new belt down into the engine bay.

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Route Belt Around Pulleys
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Hold Last Loop
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Rotate Tensioner Back
Wrap the belt around the large crankshaft, then the A/C compressor pulley, under the idler pulley and hold the last loop near the alternator at the top of the engine.

Place the 14mm socket on the false nut attached to the tensioner arm.

Firmly rotate the ratchet back towards the windshield until there is enough slack in the new belt to slip it over the alternator pulley.

Very carefully release the tensioner by allowing the ratchet to rotate forward towards the front of the vehicle.

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Slip On Last Loop
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New Belt Installed
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Testing New Belt
Double check that the new belt is properly installed and aligned with the ribs on the pulleys.

To test the new belt, start the engine and listen closely for any strange sounds. If you hear any weird noises, immediately turn off the ignition and check your work again.

Be sure to write down the belt change in your vehicle's service records.

There is no specific service interval listed for the serpentine belt in the "Warranty and Maintenance" guide. From what I've read, the belt should changed every 60,000 to 100,000 miles or at least every 5 to 7 years.

For more, please check out all of my 2019-2023 Toyota RAV4 DIY Repair & Maintenance Guides.
 

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