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Grayham127



Joined: 09 Feb 2016
Posts: 6

PostPosted: Tue Feb 09, 2016 3:55 am    Post subject: Engine noise Reply with quote

Whilst on tickover I can hear a low grumbling noise like a bearing failing. then when I switch off the engine it continues for two or three seconds after the engine stops.
My garage are completely foxed by this so HELP....
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Grayham
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Thupertrooper



Joined: 15 Jun 2013
Posts: 555
Location: Mesa,AZ

PostPosted: Tue Feb 09, 2016 8:35 am    Post subject: Reply with quote

Might be a pulley
Take belt off and spin each pulley or alternator
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smj999smj
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Joined: 22 Jan 2012
Posts: 5058
Location: Prospect, VA

PostPosted: Tue Feb 09, 2016 5:15 pm    Post subject: Reply with quote

It could be a bad torque converter, too. It's hard to say without hearing the noise for oneself.
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Grayham127



Joined: 09 Feb 2016
Posts: 6

PostPosted: Thu Feb 11, 2016 6:55 pm    Post subject: Reply with quote

smj999smj wrote:
It could be a bad torque converter, too. It's hard to say without hearing the noise for oneself.


Manual Gearbox so no torque converter. Thanks for the thought.
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Grayham
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Grayham127



Joined: 09 Feb 2016
Posts: 6

PostPosted: Thu Feb 11, 2016 6:58 pm    Post subject: Reply with quote

Thupertrooper wrote:
Might be a pulley
Take belt off and spin each pulley or alternator


All components connected directly to engine (everything you can see) stop immediately the engine stops. Water pump bearing was my first thought but this stops with the engine. Noise continues after all the bits you can see are stationery...

Thank you for your thoughts.
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Grayham
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smj999smj
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Joined: 22 Jan 2012
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PostPosted: Fri Feb 12, 2016 9:11 am    Post subject: Reply with quote

What year is your Pathy?
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2006 Pathfinder LE VQ40DE AWD, aftermarket radiator, Airlift 1000's, Bilstein HD rear shocks, Doug Thorley shortie headers and mid-pipes, Magnaflow 12580 muffler, aFe Momentum GT CAI w/ dry filter, XTP plenum spacer, Superchips Flashpaq tuner
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Grayham127



Joined: 09 Feb 2016
Posts: 6

PostPosted: Tue Feb 16, 2016 9:05 pm    Post subject: Reply with quote

smj999smj wrote:
What year is your Pathy?

2005. I have had a suggestion that it could be the air con pump clutch spinning after the engine stops. This would account for the fact that nothing seems to be moving visibly under the bonnet!
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Grayham
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Grumpah
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Joined: 20 Nov 2013
Posts: 131
Location: Fairfield County, Connecticut

PostPosted: Thu Feb 18, 2016 6:39 pm    Post subject: Reply with quote

Grayham127 wrote:
smj999smj wrote:
What year is your Pathy?

2005. I have had a suggestion that it could be the air con pump clutch spinning after the engine stops. This would account for the fact that nothing seems to be moving visibly under the bonnet!


You've posted your question in the wrong forum. Try http://www.thenissanpath.com/viewforum.php?f=34.
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Grayham127



Joined: 09 Feb 2016
Posts: 6

PostPosted: Fri Feb 19, 2016 5:33 am    Post subject: Reply with quote

Thank you all for the suggestions. I have now found the culprit!
It seems that the Alternator has a free wheel clutch mechanism inside the drive pulley. This allows the alternator to continue to turn after the pulley stops!
Share this with your friends Laughing
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