Belt noise after MI pulley?

[Captain Slow]

I've got some belt noise after doing the MI pulley. Not squeal, just an audible (windows down sitting in car) sound of the belt spinning around. Is this just a quality of the lighter pulley or should I have my belt checked again? I've never done a lightweight crank pulley before and wanted to make sure this wasn't normal before I started poking around.

[cali yaris]

I would check your belt tension but it shouldn't make more audible noise.

[tooter]

I would check your belt tension but it shouldn't make more audible noise.

That raises a question... is there any such thing as inaudible noise? :wink:

[DJYojimbo]

Can u record the video? Maybe Garm can confirm if its normal or not

[Golddeenoh]

That raises a question... is there any such thing as inaudible noise? :wink:

Audible just means that it can be heard by human ears, so yes there are inaudible noises, and dogs can hear sounds we can not.

[cali yaris]

^ My wife arguing with me, for example.

[tooter]

^ My wife arguing with me, for example.


:laugh:

My wife says I have selective hearing.

[jpmck03]

:laugh:

My wife says I have selective hearing.

:laughabove: You, too?

[Golddeenoh]

apparently i have a some hearing difficult in my right ear, typically that is the side were my wife tends to be when she is asking me something and i get to look over at her while she gives me the stare of death while i have not the slightest clue as to what she said.

[Captain Slow]

i will record some audio of it later. it's definitely audible though.

[1.5]

Are there any cracks in the belt? Time to replace?

This thread went from drive belt noise to ignoring complaining women lol

[tooter]

My thought is that it could possibly be the anodized surface on which the belt runs which is relatively slippery compared to a raw aluminium surface. If it was me, I'd remove it, mask it off with some tape and beadblast just the belt grooves alone, although lately my solution to everything has been to blast it. :laugh:

[WeeYari]

It's all speculation until an actual audio is made available. I don't believe captain is experiencing any noises associated with slippage, as those are very easily identifiable. Also, belt age should not be an issue since the car is only a 2010.

My thoughts, again speculation, is harmonic. The sound resonating from the MI pulley differs from OEM due to its aluminum vs cast construction. He is probably hearing a different 'whirring' sound.

[Captain Slow]

Yeah, it's not slippage for sure. Just a different (but noticeably louder) sound at idle. I've got a Zoom H2 and will record and post it up later today.

[Captain Slow]

I've attached the wav file inside of a zip file.

It's just a high-pitched sound as the belt revolves, kinda annoying.

[DJYojimbo]

Hope Garm can help you with your problem captain! I want to install this pulley too :)

[CTScott]

I've attached the wav file inside of a zip file.

It's just a high-pitched sound as the belt revolves, kinda annoying.

That really sounds like a loose belt to me.

[DJYojimbo]

How many ft lbs is it supposed to be?

[CTScott]

How many ft lbs is it supposed to be?

There isn't a torque measurement for a belt, but rather a deflection and a tension measurement. They point to check is half way between the alternator and the crank pulley.

Deflection:
New belt 7.0 to 8.5 mm (0.28 to 0.33 in)
Used belt 11 to 13 mm (0.43 to 0.51 in)

Tension:
New belt 539 to 637 N (55 to 65 kg, 121 to 143 ld)
Used belt 245 to 392 N (25 to 40 kg, 55 to 88 ld)

[frownonfun]

when i had a loose belt it sounded like there was a pig being slaughtered under my hood. so idk, that doesn't sound so much like a loose belt to me. then again if CT says it does maybe you should listen to him.

[frownonfun]

There isn't a torque measurement for a belt, but rather a deflection and a tension measurement. They point to check is half way between the alternator and the crank pulley.

Deflection:
New belt 7.0 to 8.5 mm (0.28 to 0.33 in)
Used belt 11 to 13 mm (0.43 to 0.51 in)

Tension:
New belt 539 to 637 N (55 to 65 kg, 121 to 143 ld)
Used belt 245 to 392 N (25 to 40 kg, 55 to 88 ld)

Yeah it's funny I called my service dept to ask them if they can measure the deflection for me and they said there's no way to measure it. They also said that because there's no tensioner that I wouldn't need to worry, it will tighten itself. I seriously wonder if I should be letting these people do my oil changes, even if it is free.

[Golddeenoh]

I assume you have already checked to make sure that the belt isn't bottoming out in the groves on the pulleys, that there is not any debris in the pulley groves, and that the pulleys are aligned?

[Captain Slow]

nope. haven't popped the hood at all. been too busy and it's cold.

figured I'd ask if this was normal before I started poking around. I used to be under a car 5 days a week swapping trannys, replacing front ends, etc... but these days I am not a big fan of doing work myself anymore, lol.

[Captain Slow]

hey guys, sorry it took me so long to reply to this topic, I've just been busy.

here is a wav file of the sound, about halfway through the idle drops and you can hear it even better. keep in mind that this was taken with the hood closed standing next to the car, not with the recorder in the engine bay.

think it may be time for a new belt or at least a retension on this one? It doesn't do it when I first crank up in the morning but starts 2-3 minutes later (I'm guessing as the belt heats up it expands).

Does the Yaris have automatic tensioners or is it something adjustable? Thanks.

FILE
http://www.filedropper.com/beltnoise

[malibuguy]

i had a bad squeal initially. new belt fixed that. now...after about 10,000miles or so...it does a tiny squeak on start up. I looked at the belt, its looks worse then it should for its age. im going to tighten it up a tiny bit more the next time i get a chance.

[Black_griffin6]

I've been having this same noise. It only happens when I drive the car for a while, and it doesn't happen when you first start the car up.

[Captain Slow]

^exactly, and it's annoying as hell.

[Yarflana]

Back to the audible vs. inaudible noise question...I believe inaudible would be that you cannot hear it over the ambient noise of the normal running of the engine; audible would be you can and seems to be what Mr. Slow is referring to. We expect noise, but when the standard deviation becomes too great, we hear the unexpected...thus, the audible.

[Captain Slow]

Just listen to the wav file I attached in an earlier post.

[why?]

the file in the earlier post is not normal. the filedropper link just goes to the main page, not to a file i can use.

i'd agree with CTScott. I have a full nst pulley set, and after tightening all the belts, i have zero extra noise that sounds anything like that. There is a chance the belt might be too tight as well, but that is a belt noise of some type.

[DJYojimbo]

still having issues with the pulley?

[TOLMACH]

Good video, helps figure out whether the issue is the tensioning or misalignment

I remember couple other videos recommending the same @water test@ to diagnose the weird noise.

http://www.youtube.com/watch?v=xSs75E9wdzk

[catliektheif]

@captainslow I'm having the same exact noise after the MI pulley and its driving me INSANE. Did you find a fix?

[yougojay]

:laugh:

My wife says I have selective hearing.

What...? :laugh: