Engine noise

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Grayham127
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Engine noise

Postby Grayham127 » Tue Feb 09, 2016 4:55 am

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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Thupertrooper
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Postby Thupertrooper » Tue Feb 09, 2016 9:35 am

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

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smj999smj
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Postby smj999smj » Tue Feb 09, 2016 6:15 pm

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

Grayham127
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Postby Grayham127 » Thu Feb 11, 2016 7:55 pm

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.

Grayham127
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Postby Grayham127 » Thu Feb 11, 2016 7:58 pm

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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smj999smj
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Postby smj999smj » Fri Feb 12, 2016 10:11 am

What year is your Pathy?

Grayham127
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Postby Grayham127 » Tue Feb 16, 2016 10:05 pm

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!

Grumpah
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Postby Grumpah » Thu Feb 18, 2016 7:39 pm

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.

Grayham127
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Postby Grayham127 » Fri Feb 19, 2016 6:33 am

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 :lol:


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