Valdemar
Posts: 2455
Joined: Tue May 10, 2011 10:32 pm
Delivery Date: 09 Sep 2011
Location: Oak Park, CA

Faint gear like noise at low speeds.

Wed Apr 18, 2018 11:25 am

2011 130k+ miles. Noticed a minor noise today while driving in a parking lot, faint periodic clicking, kind of gear type clatter. Doesn't seem to be affected by the steering. Can it be the CV joint? Hope it's not the reduction gear, gear oil change is overdue but it doesn't usually cause issues this early.
'11 SL, totaled
-1CB@33k/21mo, -2CB@53k/33mo, -3CB@68k/41mo, -4CB(41.5AHr)@79k/49mo, -5CB(38.85AHr)@87.5k/54mo
-0CB(66.14AHr)@87.5k/54mo (BBB)
54.94AHr, SOH 86%, 130k miles
9kW Solar

LeftieBiker
Posts: 8657
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: Faint gear like noise at low speeds.

Wed Apr 18, 2018 1:02 pm

IIRC, a noisy CV joint will make more noise when turning one way than the other. Try some low speed sharp turns.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

Valdemar
Posts: 2455
Joined: Tue May 10, 2011 10:32 pm
Delivery Date: 09 Sep 2011
Location: Oak Park, CA

Re: Faint gear like noise at low speeds.

Wed Apr 18, 2018 10:09 pm

I'll experiment more but turning didn't seem to have any effect, which makes me think it might not be the CV joint.
'11 SL, totaled
-1CB@33k/21mo, -2CB@53k/33mo, -3CB@68k/41mo, -4CB(41.5AHr)@79k/49mo, -5CB(38.85AHr)@87.5k/54mo
-0CB(66.14AHr)@87.5k/54mo (BBB)
54.94AHr, SOH 86%, 130k miles
9kW Solar

SageBrush
Posts: 2219
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: Colorado

Re: Faint gear like noise at low speeds.

Wed Apr 18, 2018 10:46 pm

Valdemar wrote:I'll experiment more but turning didn't seem to have any effect, which makes me think it might not be the CV joint.

I've forgotten details but failure of the joint on the wheel side and transmission sides of the half-shaft have different symptoms.
2013 Model 'S' with QC & rear-view camera
Bought off-lease Jan 2017 from N. California
Car is now enjoying an easy life in Colorado
3/2018: 58 Ahr, 28k miles

Valdemar
Posts: 2455
Joined: Tue May 10, 2011 10:32 pm
Delivery Date: 09 Sep 2011
Location: Oak Park, CA

Re: Faint gear like noise at low speeds.

Thu Apr 19, 2018 12:30 am

SageBrush wrote:
Valdemar wrote:I'll experiment more but turning didn't seem to have any effect, which makes me think it might not be the CV joint.

I've forgotten details but failure of the joint on the wheel side and transmission sides of the half-shaft have different symptoms.


Good point. I always thought that the transmission side almost never breaks however.
'11 SL, totaled
-1CB@33k/21mo, -2CB@53k/33mo, -3CB@68k/41mo, -4CB(41.5AHr)@79k/49mo, -5CB(38.85AHr)@87.5k/54mo
-0CB(66.14AHr)@87.5k/54mo (BBB)
54.94AHr, SOH 86%, 130k miles
9kW Solar

goldbrick
Posts: 106
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Colorado front range

Re: Faint gear like noise at low speeds.

Thu Apr 19, 2018 9:14 am

Valdemar wrote:Good point. I always thought that the transmission side almost never breaks however.


Depends on the specific car. For example, on a Subaru Outback the inner (trans side) joint fails at > 2x the rate of the outer joint since it is close to the exhaust and the additional heat ages the rubber quickly. But in general, the outer joint sees more stress since it experiences higher articulation angles during normal use.

On most of the cars I've had, outer joint failures will show up as clicking on tight turns. Inner joint failures usually show up as vibration under acceleration. Of course, the easy test is to check the boots. Most modern CV joints will last as long as the car if the boots are intact.

Valdemar
Posts: 2455
Joined: Tue May 10, 2011 10:32 pm
Delivery Date: 09 Sep 2011
Location: Oak Park, CA

Re: Faint gear like noise at low speeds.

Thu Apr 19, 2018 9:28 am

Ditto on Subaru, both inner boots went too early on our Tribeca, the joints are holding up though.
'11 SL, totaled
-1CB@33k/21mo, -2CB@53k/33mo, -3CB@68k/41mo, -4CB(41.5AHr)@79k/49mo, -5CB(38.85AHr)@87.5k/54mo
-0CB(66.14AHr)@87.5k/54mo (BBB)
54.94AHr, SOH 86%, 130k miles
9kW Solar

User avatar
Nubo
Posts: 4726
Joined: Fri May 28, 2010 11:01 am
Delivery Date: 31 Oct 2014
Location: Vallejo, CA

Re: Faint gear like noise at low speeds.

Thu Apr 19, 2018 5:38 pm

Hard to diagnose sounds via text, but I'll just note that I've had "faint periodic clicking" noises from objects embedded in tires, from small stones embedded in the tread and also nails and screws; most easily heard at low speeds with windows down. I've avoided punctures several times by finding and removing metal objects before they penetrated the belts.
I noticed you're still working with polymers.

Valdemar
Posts: 2455
Joined: Tue May 10, 2011 10:32 pm
Delivery Date: 09 Sep 2011
Location: Oak Park, CA

Re: Faint gear like noise at low speeds.

Fri Apr 20, 2018 9:11 am

I know but this is definitely not tires. Sounds more like gear teeth engaging during rotation, hence the concern about the reduction gear, but from my experience with failing differentials they tend to whine at high speed, nothing like that fortunately, or at least not yet. The sound is very faint, can only be heard with windows up and the speed may be up to 3mph.
'11 SL, totaled
-1CB@33k/21mo, -2CB@53k/33mo, -3CB@68k/41mo, -4CB(41.5AHr)@79k/49mo, -5CB(38.85AHr)@87.5k/54mo
-0CB(66.14AHr)@87.5k/54mo (BBB)
54.94AHr, SOH 86%, 130k miles
9kW Solar

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