Toyota Yaris Serpentine Belt
Replacement Guide
How to change the serpentine accessory
belt on a 1NZ-FE 1.5L I4 engine in a 3rd generation 2012-2016 Toyota Yaris.
2015 Yaris 1NZ-FE 1.5L I4 |
Left (Passenger) Side |
Alternator & Bracket |
This
automotive maintenance tutorial was specifically written to assist
owners of the third generation (2012, 2013, 2014, 2015 & 2016)
Toyota Yaris in changing the serpentine accessory belt on the 1NZ-FE
1.5 liter inline four cylinder motor or adjusting the tension. Owners of other Toyota, Lexus or Scion vehicles such as the Corolla, Matrix, Prius, Camry, RAV4, Sienna, Tacoma, Tundra, FJ Cruiser, Venza, Highlander, Avalon, Sequoia, Land Cruiser, IS 250, ES 350, GS 350, tC, xB, xD, iQ and FR-S may also find these DIY instructions to be helpful. The OEM belt part number for a Yaris equipped with A/C (air conditioning) is Toyota # 90916-02705. A few other compatible replacement belts with their part numbers are as follows: Gates K040476, Bando 4PK1210 and Dayco 5040478. The tools needed to complete this procedure include a 12mm socket, a 14mm socket and a 3/8" drive ratchet. |
||
|
||
Please verify the correct replacement belt for your Yaris by using the Amazon Part Finder website. The compatible part numbers may vary depending on the model year, engine type, trim level and whether or not the car has A/C (air conditioning). |
||
Bottom Alternator Bolt |
Loosen Top 12mm Bolt |
Butane BBQ Lighter |
The first two steps are to open the hood and then move to the left (passenger) side of the engine bay. To release the tension on the old OEM serpentine belt, you'll have to loosen the top and bottom bolts on the alternator. Loosen the top alternator bolt by turning it counterclockwise with a 12mm socket and a 3/8" drive ratchet. If you have trouble loosening the bolt, warm it up for about 30 to 60 seconds with a long nose grill lighter. |
||
Heat Up Bottom Bolt |
Loosen Counterclockwise |
Both Bolts Loosened |
I found it very
difficult to loosen the bottom alternator bolt. So I used a BBQ lighter to
heat the bolt for about a minute to soften the threadlocker adhesive
compound that was applied at the factory. Loosen the bottom bolt by turning it counterclockwise with a 14mm socket and a 3/8" drive ratcheting wrench. Don't completely remove the two bolts. They only need to be loosened a few turns. |
||
Pivot Alternator Back |
Pull Old Belt Off Pulleys |
Slip Belt Off Crankshaft |
Once both bolts
have been loosened, firmly push back on the alternator until it rotates
towards the rear of the engine bay to release the tension on the old belt. The top bolt will pivot back to the rear of the tension adjustment bracket. Carefully slip the old belt off the various pulleys including the alternator, water pump, A/C compressor and the crankshaft. |
||
Removing Old Belt |
Old Belt Removed |
Inspect Old OEM Belt |
Lift the old belt
out of the engine bay. Inspect the old belt for any damage, chunks of missing rubber, fraying or cracks. If the old belt is in relatively good condition, consider keeping it in your trunk or at least your garage for emergency use just in case the new belt fails. I recommend buying the genuine OEM Toyota 90916-02705 serpentine belt. The Gates K040476 belt is also a good choice since it has excellent reviews on Amazon. |
||
|
||
Belt Routing Diagram |
Lower In New Belt |
Route New Belt |
If you don't have
your owner's manual, I included a picture of the belt routing diagram for
the 1NZ-FE 1.5L VVT-i I4 engine with A/C (air conditioning). Lower the new belt in to the left side of the engine bay. A good rule to remember is that the ribbed side of the belt gets wrapped around the ribbed pulleys and the smooth side goes against the smooth pulleys. Start by wrapping the belt around the large crankshaft pulley at the bottom of the engine bay. |
||
Belt Over A/C Compressor |
Wrap Belt Around Crankshaft |
Slip Belt Over Alternator |
Continue wrapping the belt around the air conditioning compressor pulley, under the water pump pulley and then slip it over the top of the alternator (generator) pulley. | ||
Lug Nut Wrench |
Use Lever To Apply Tension |
Tighten Top 12mm Bolt |
In order to apply
the correct amount of tension on the new pulley, I used the flat end of the
tire iron as a lever in between the alternator and the engine block. Firmly pull the alternator forward to pivot the top alternator bolt towards the front of the tension adjustment bracket. Maintain the tension on the new belt with one hand on the lug nut wrench and tighten the top 12mm bolt in the clockwise direction with the other hand. |
||
Tighten Lower 14mm Bolt |
Check Belt Tension |
Serpentine Belt Replaced |
Tighten the bottom
14mm bolt in the clockwise direction until it is snug. To check the tension on the new belt, grab the belt at the longest run in between the alternator and the crankshaft pulley. Try to twist the middle of the belt until it is almost perpendicular with the rest of the belt. If you can twist the middle section of the longest run farther than 90 degrees, the belt is too loose. If you can't twist the belt to about 90 degrees, it might be too tight. Once you are satisfied that the belt has the correct amount of tension, double check that the top 12mm bolt and the bottom 14mm bolt are tight. Start the engine and listen closely for any strange sounds or noises that might indicate a problem such as an improperly routed belt, a seized pulley, excessive belt tension or not enough tension. If you hear a loud continuous screeching or squealing sound when you start the engine, immediately turn off the ignition. The new belt might be far too tight and it won't spin on the pulleys. Loosen the two bolts, relieve some of the tension, and tighten the bolts again. If you hear an occasional "chirp, chirp, chirp", squeak or squeal sound, the new belt might be too loose and it is skipping on one or more of the pulleys. Loosen the two bolts, apply some more tension with the lug nut wrench and tighten the bolts again. Be sure to record the belt change in your vehicle's service records. For more,
check out all of my
2012-2016 Toyota Yaris DIY Repair & Maintenance Guides. |
If you found this guide to be helpful,
please consider making a small donation by clicking on the PayPal.com
"Donate" button located to the right of this paragraph. Thank you!
(Note: I am not a registered charity. Donations are not tax deductible.) |
Copyright 2024 © PaulsTravelPictures.com
All Rights Reserved ®
Paul's Travel Pictures is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. |
Privacy Policy About Paul & Author Contact Info