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Knocking noise from a front wheel - second gen Prius - Page 2

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Posted by passerby on December 15, 2012, 11:08 pm
 
replying to passerby, passerby wrote:
And so I lifted it again and turned the wheel when the car and the tires were
warm. Made no difference - I still cannot hear anything when turning by hand.
The noise was definitely there when I was driving it, so it looks like the
weight of the car is an important factor.

Would a faulty wheel bearing make the same noise when loaded as when it's not?

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Posted by Elmo P. Shagnasty on December 16, 2012, 2:57 am
 


That would be your dampers.  How was the tread wear?

Posted by passerby on December 16, 2012, 5:08 am
 replying to Elmo P. Shagnasty , passerby wrote:

The tires are almost brand new and the thread is still rather deep. So, if
there's wear that caused by this issue, it's really hard to see yet.

As far as dampers making the noise: I always thought dampers would make random
noises because of the road. And there's no hissing either. Well, as much as I
can tell - it's only apparent around 15-20MPH and it's already pretty noisy at
that speed.

Do you think it makes sense to have that wheel balanced again for just in case
and see what happens?

Thanks!  
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Posted by Daniel who wants to know on December 22, 2012, 2:12 am
 
That would be the cogging torque of the permanent magnet motor/generators
(MG1 and MG2) along with the slop in the PSD, final drive gears, and silent
chain.

Remember that the Prius does not actually have a CVT, they just called it an
E-CVT because it was the closest category to put it in.

http://prius.ecrostech.com/original/Understanding/PowerTrain.htm  


Posted by Elmo P. Shagnasty on December 13, 2012, 1:27 am
 

This isn't it because it wouldn't necessarily be synchronized with the
wheel rotation on a 1:1 basis, but a buddy of mine wrestled with a
knocking noise that turned out to be a screwdriver left inside his tire.

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