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Whirring noise in park and neutral 

 

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 Post subject: Whirring noise in park and neutral
Posted: Sat Jul 13, 2013 6:52 am 
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Hey,

EL Falcon developed a dry pulley whine/grinding type noise while in park and neutral. Sometimes it disappears for a bit then comes back. Put the car in any other gear noise goes away.

Trans has been flushed/filter changed. Oil changed and pulleys feel fine and ran engine with belt off and noise is still there.

I've only had a quick look at this but when you drive it, transmission shifts smoothly and never makes the noise unless stated above.

Noise seems to be coming from the transmission area I think.

Thoughts?
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 Post subject: Re: Whirring noise in park and neutral
Posted: Sat Jul 13, 2013 6:59 am 
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Sort of sounds like a dry speedo cable. Do EL's have a speedo cable?
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 Post subject: Re: Whirring noise in park and neutral
Posted: Sat Jul 13, 2013 9:55 am 
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snavy wrote:
Sort of sounds like a dry speedo cable. Do EL's have a speedo cable?


no. haven't since XF I believe

 

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 Post subject: Re: Whirring noise in park and neutral
Posted: Sat Jul 13, 2013 10:44 am 
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89.SVO wrote:
snavy wrote:
Sort of sounds like a dry speedo cable. Do EL's have a speedo cable?


no. haven't since XF I believe


More like haven't since XB/XC.
Even the XD's has an electronic speedo.

 

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 Post subject: Re: Whirring noise in park and neutral
Posted: Sat Jul 13, 2013 12:02 pm 
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Yep, XC Falcons were the last to run a speedo cable.
That whirring noise may be a worn bushing/bearing or worn pump for the input shaft on the tranny....????
Anybody confirm this ????

 

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 Post subject: Re: Whirring noise in park and neutral
Posted: Sat Jul 13, 2013 12:42 pm 
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Wouldn't it be doing it in loaded gears as well? A worn transmission pump is more of a high pitched whine?
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 Post subject: Re: Whirring noise in park and neutral
Posted: Sat Jul 13, 2013 2:00 pm 
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Matt_jew wrote:
89.SVO wrote:
snavy wrote:
Sort of sounds like a dry speedo cable. Do EL's have a speedo cable?


no. haven't since XF I believe


More like haven't since XB/XC.
Even the XD's has an electronic speedo.


wasn't exactly sure, but was sure of XF as I owned one

 

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 Post subject: Re: Whirring noise in park and neutral
Posted: Sat Jul 13, 2013 5:23 pm 
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snavy wrote:
Wouldn't it be doing it in loaded gears as well? A worn transmission pump is more of a high pitched whine?


Converter on the way out ????

 

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 Post subject: Re: Whirring noise in park and neutral
Posted: Sat Jul 13, 2013 6:01 pm 
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The transmission shifts fine, no slip. Trans oil was still red when I emptied it and there was no metal sludge on the pan. Oil did not smell burnt.

Stalled it up it definitely doesn't feel like anythings wrong. If you didn't go into park or neutral, you wouldn't know there was a problem.

I replaced the transmission drive shaft oil seal and the output shaft was moving around a fair bit. Does this resonate on the falcons when worn?
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 Post subject: Re: Whirring noise in park and neutral
Posted: Mon Jul 15, 2013 12:34 pm 
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The BTR automatics have a habit of torque convertor bolts coming loose and contacting the front cover plate on the transmission. Worth checking this, just in case. It's not hard to check the bolts with the front of the car up on stands, and all it costs is a bit of threadlocker (if you don't want to be doing it again in six months).

 

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 Post subject: Re: Whirring noise in park and neutral
Posted: Mon Jul 15, 2013 2:32 pm 
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Checked it, they are fine.

I used a stethoscope to pin point where the noise was coming from and it was coming from the transmission extension housing. Changed the bush and seal and the noise is still there??

The only thing is the speedo pedometer looked a bit bent where the plastic gear part is. I can't see this being the issue its not doing anything while the cars stationary.

You hear the noise put it in drive its dead silent like normal then about a minute being in drive the noise starts again. This is the same as in neutral.
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 Post subject: Re: Whirring noise in park and neutral
Posted: Mon Jul 15, 2013 2:35 pm 
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What about changing the gasket, springs and O'rings on the rear Servo ????....just a thought.
Also check the servo piston for cracks.

 

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 Post subject: Re: Whirring noise in park and neutral
Posted: Wed Jul 17, 2013 10:46 am 
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The car was taken to an auto trans place for a diagnosis. They said full rebuild. Just doesn't sound right. No debris in the fan, oil was good.
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 Post subject: Re: Whirring noise in park and neutral
Posted: Wed Jul 17, 2013 10:54 am 
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Obviously they just want your money
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 Post subject: Re: Whirring noise in park and neutral
Posted: Wed Jul 17, 2013 11:27 am 
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Yep as they always do!

To me just sounds like a bearing in the trans somewhere being noisy. Driving the car you wouldn't even know the gearbox "requires a rebuild"!!
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