Timing belt replacement

Tiny
IMAGING
  • MEMBER
  • 2005 TOYOTA SIENNA
  • 3.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 125,000 MILES
I have some videos and pics of my timing belt. Do you think I need to replace it?
Friday, October 8th, 2021 AT 1:54 PM

8 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This is known as a drive belt or serpentine belt and only needs to be replaced when it is cracking, making noise, or slipping.

So, if you have not replaced this belt in a while, I would just remove it and inspect the side of the belt with ribs on it and find out if there are cracks in it.

The back side doesn't tell us much, but it looks pretty clean.

Here is a guide that will help with this:

https://www.2carpros.com/articles/replace-serpentine-belt

Below you will find the process from the manual that will help with this.

As for the timing belt. That is to be replaced at 90,000 miles. If it has not been replaced, then we need to go ahead and do that.

Please let me know and we can help with that as well. Thanks
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Friday, October 8th, 2021 AT 3:22 PM
Tiny
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How about the sound that is making. Is that healthy?
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Saturday, October 9th, 2021 AT 2:04 AM
Tiny
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I am sorry. I heard that and meant to mention it. That is the sound or a bearing that is failing.

First thing I would do to confirm it is removing the belt and run the engine for a minute and make sure that grinding/rattling noise is gone.

Then put the belt back on and use a long screwdriver touch it to each pulley (in a safe spot that it won't get caught in the pulley) and then touch your ear to the handle of the screwdriver.

The place that this noise sounds the loudest is the pulley that is failing.

Here is a guide that talks about this type of noise:

https://www.2carpros.com/articles/vehicle-scraping-noise

You can also get a mechanics stethoscope from most any parts store to listen to this as well and that would be more accurate but not required. I posted a picture below of this.

Let us know what you find with this and if you have other questions on it.

If you remove the belt and the noise is still there then that noise is inside the timing cover at which point, I would go in and change the belt if you have not done it yet and inspect everything while you are there.
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Saturday, October 9th, 2021 AT 6:05 AM
Tiny
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Where would the bearing be?
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Saturday, October 9th, 2021 AT 10:22 AM
Tiny
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The bearing is part of each of the pulleys. So, on all pulleys there is a sealed bearing that when they get water intruding in them, they start to rust and eventually start making noise then will fail.

So, we need to find which pulley this is and replace the pulley which comes with the bearing if possible. However, depending on which one it is, you may not be able to get just the pulley like the tensioner.

Let me know what you find, and we can go from there. Thanks
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Saturday, October 9th, 2021 AT 10:53 AM
Tiny
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How do I know which one is bad?
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Sunday, October 10th, 2021 AT 8:38 AM
Tiny
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How do I know which one is it and do you have a picture of the bearing.
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Sunday, October 10th, 2021 AT 8:39 AM
Tiny
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Check out my prior post. We need to use what is called a stethoscope and listen to each of the pulleys. I put a picture of one for your review.

You actually have two belts. One for the alternator and compressor. A second for the power steering pump.

I put a picture of this below. Each of these pulleys have a bearing and we need to listen to each and see where this noise is the loudest.

Also, you need to start with removing the alternator belt and see if the noise goes away. If it does not, then the power steering pump pulley is the issue.

If it does not go away, then your alternator is most likely the issue, but it could be the compressor which is why we need to test it as described.
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Sunday, October 10th, 2021 AT 3:50 PM

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