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UkrainianKozak
Posts: 355
Joined: Thu May 12, 2011 2:53 pm
Delivery Date: 12 May 2011
Leaf Number: 001065
Location: Redmond, WA

Re: Clicking noise during acceleration and decceleration

Wed Jun 26, 2013 3:13 pm

Bateman wrote:I'd be curious if others have the sound stop when braking in neutral, as I was able to find out. I'm assuming this eliminates the brakes as the cause of the noise.


Yes, same for me, If I break on neutral I don't have a noise, and I actually can make some small crackling noise while playing between max regen in Eco and full accelleration, without touching the brakes at all. it is definitely coming from somewhere in drivetrain.
Leaf SL-e
Redmond, WA

41 000 electric miles and counting...

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Bateman
Posts: 101
Joined: Sun May 26, 2013 3:31 pm
Delivery Date: 25 May 2013
Location: Central NJ

Re: Clicking noise during acceleration and decceleration

Wed Jun 26, 2013 3:39 pm

Interesting that your relatively early-build 2011 and my brand new 2013 domestic unit have the same symptoms.
Bateman
2013 Blue Ocean Leaf SV

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TomT
Posts: 10555
Joined: Sun Aug 08, 2010 12:09 pm
Delivery Date: 01 Mar 2011
Leaf Number: 000360
Location: Foothills of Granada Hills, CA
Contact: Website

Re: Clicking noise during acceleration and decceleration

Wed Jun 26, 2013 4:35 pm

Apparently the problem is that the cotter keys can get loose and rattle in the hub. It is not a safety or mechanical issue, just a noise...

UkrainianKozak wrote:
potrero wrote:for what its worth, I had this same problem and was told it was s simple fix - "replacing the cotter pins at the hubs on the two front wheels." they did this yesterday, free under warrantee, and the clicking sound seems to be gone. they said theyve seen this alot (not sure if just on Leafs or on other Nissans too). We'll see if it comes back.
That does not sound right...
Cotter pins are there just for safety, to make sure the main axle nut won't come lose, but AFAIK that nut should be always tightened to a certain momentum, so the only way the cotter pin can make sound is if the nut is loose, which is a bad thing by itself and might cause the wheel to wobble...
59,991 miles/12 bars/289 Gids/68.54 AHr/101% SOH/101.64% Hx 7May15 w/ new Lizard (barely made the warranty).
71,770 miles/12 bars/256 Gids/59.04 AHr/88% SOH/87.92% Hx 3Mar16 at lease return.

Now driving a 2016 Volt Premier. Model 3 reserved.

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Bateman
Posts: 101
Joined: Sun May 26, 2013 3:31 pm
Delivery Date: 25 May 2013
Location: Central NJ

Re: Clicking noise during acceleration and decceleration

Wed Jun 26, 2013 5:34 pm

TomT wrote:Apparently the problem is that the cotter keys can get loose and rattle in the hub. It is not a safety or mechanical issue, just a noise...


Any chance you can confirm your vehicle still makes the noise when braking in neutral? If its really a cotter pin, it should happen regardless of transmission selection....
Bateman
2013 Blue Ocean Leaf SV

User avatar
UkrainianKozak
Posts: 355
Joined: Thu May 12, 2011 2:53 pm
Delivery Date: 12 May 2011
Leaf Number: 001065
Location: Redmond, WA

Re: Clicking noise during acceleration and decceleration

Wed Jun 26, 2013 6:14 pm

TomT wrote:Apparently the problem is that the cotter keys can get loose and rattle in the hub. It is not a safety or mechanical issue, just a noise...

UkrainianKozak wrote:
potrero wrote:for what its worth, I had this same problem and was told it was s simple fix - "replacing the cotter pins at the hubs on the two front wheels." they did this yesterday, free under warrantee, and the clicking sound seems to be gone. they said theyve seen this alot (not sure if just on Leafs or on other Nissans too). We'll see if it comes back.
That does not sound right...
Cotter pins are there just for safety, to make sure the main axle nut won't come lose, but AFAIK that nut should be always tightened to a certain momentum, so the only way the cotter pin can make sound is if the nut is loose, which is a bad thing by itself and might cause the wheel to wobble...


Maybe we are talking about different issues here...
The noise that I'm talking about has nothing similar to rattle, it sounds more like stress crackling, and the more power you give, the louder it is and you hear more crackling. Rattle from loose pins would not depend on the torque... only on rotation... and I can't imaging how can you get that LOUD crackling from loose pin...
Leaf SL-e
Redmond, WA

41 000 electric miles and counting...

User avatar
TomT
Posts: 10555
Joined: Sun Aug 08, 2010 12:09 pm
Delivery Date: 01 Mar 2011
Leaf Number: 000360
Location: Foothills of Granada Hills, CA
Contact: Website

Re: Clicking noise during acceleration and decceleration

Wed Jun 26, 2013 7:47 pm

Actually, mine has never had that noise; I was just reporting what I had been told...
Mine had the whir at very low speeds (below 3 mph) caused by the lub issue (for which there is a TSB). BTW, that fix only lasted about 2,000 miles and the noise is now back... Sigh.

Bateman wrote:
TomT wrote:Apparently the problem is that the cotter keys can get loose and rattle in the hub. It is not a safety or mechanical issue, just a noise...

Any chance you can confirm your vehicle still makes the noise when braking in neutral? If its really a cotter pin, it should happen regardless of transmission selection....
Last edited by TomT on Mon Jul 01, 2013 8:36 pm, edited 1 time in total.
59,991 miles/12 bars/289 Gids/68.54 AHr/101% SOH/101.64% Hx 7May15 w/ new Lizard (barely made the warranty).
71,770 miles/12 bars/256 Gids/59.04 AHr/88% SOH/87.92% Hx 3Mar16 at lease return.

Now driving a 2016 Volt Premier. Model 3 reserved.

User avatar
Bateman
Posts: 101
Joined: Sun May 26, 2013 3:31 pm
Delivery Date: 25 May 2013
Location: Central NJ

Re: Clicking noise during acceleration and decceleration

Mon Jul 01, 2013 12:38 pm

Took my car into the dealer, they called and said that they have lubricated splines in the drivetrain and that has fixed it. I'll know more tomorrow and only time will tell if that fixes the issue permanently.
Bateman
2013 Blue Ocean Leaf SV

cliff
Posts: 104
Joined: Mon May 13, 2013 10:36 am
Delivery Date: 15 Sep 2012
Leaf Number: 022673
Location: Federal Way, WA

Re: Clicking noise during acceleration and decceleration

Mon Jul 01, 2013 2:07 pm

UkrainianKozak wrote:The noise that I'm talking about has nothing similar to rattle, it sounds more like stress crackling, and the more power you give, the louder it is and you hear more crackling.


Hopefully not from bearing arcing due to a problem with the reduction gear brush. I don't know if
you could hear this, but have read that it can reduce bearing life by 80%. I found it interesting that
the brush is not directly on the motor rotor, but instead on the offset gear. I wonder if this means
the gear oil needs to be conductive?

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planet4ever
Posts: 4674
Joined: Sat Apr 03, 2010 9:53 pm
Delivery Date: 02 May 2011
Leaf Number: 1537
Location: Morgan Hill, CA, south of San Jose

Re: Clicking noise during acceleration and decceleration

Mon Jul 01, 2013 4:00 pm

cliff wrote:Hopefully not from bearing arcing due to a problem with the reduction gear brush.
Good try, but not on a LEAF motor. It has no brushes at all. The rotor is a permanent magnet, and the only place the electricity goes is to the stator.

Ray
End of April 2013: Traded my 2011 SL for a 2013 S with charge pkg.

cliff
Posts: 104
Joined: Mon May 13, 2013 10:36 am
Delivery Date: 15 Sep 2012
Leaf Number: 022673
Location: Federal Way, WA

Re: Clicking noise during acceleration and decceleration

Tue Jul 02, 2013 1:15 am

planet4ever wrote:Good try, but not on a LEAF motor. It has no brushes at all. The rotor is a permanent magnet, and the only place the electricity goes is to the stator.

Ray


Because the stator is driven by high voltage pulses that simulate a sine wave, I have read that there are
2 effects, one is the the high voltage spikes induce a voltage in the rotor, 2 because it is not
a perfect sine wave the 3 phase drive is not always balanced, so current flows in the rotor.
The article I read (sorry lost reference) showed pictures of deep scoring in a bearing (though
not the Leaf motor). I suspect lower voltage dc brushless motors may not be as strongly effected.
The service manual does show a brush in the reduction gear.

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