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![]() | Home > Technical > Noise like a dry bearing |
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thehelper Member Since: 29 Jul 2018 Location: Cambridgeshire Posts: 151 ![]() ![]() ![]() |
Hi I have a 2008 diesel auto. I have noise like a dry bearing, it seems to change note with rpm, and comes from in front. It only happens with the engine up to temp and kicks in only when the engine cooling fans kick in, which they do for 10 seconds or so every 30 seconds or so. It can only be heard at slow speeds or when stationary, probably because that is when the fans are needed. It does not happen with the heater and aircon turned off.
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 3219 ![]() ![]() ![]() |
Have you thought about the Alternator Pulley.
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thehelper Member Since: 29 Jul 2018 Location: Cambridgeshire Posts: 151 ![]() ![]() ![]() |
Constructive answers, thanks guys.
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Nodge68 Member Since: 15 Jul 2020 Location: Newquay Posts: 2086 ![]() ![]() ![]() |
If the bearing noise is only there when the fans are running, then it's likely a fan bearing at fault. |
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seagull1 Member Since: 23 Jan 2011 Location: Loughborough Posts: 327 ![]() ![]() ![]() |
I have the same problem, mine is not the fans as unplugged them and it's still there but does stop as soon as the aircon is switched off.
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merlinj79 Member Since: 13 Aug 2019 Location: San Diego Posts: 315 ![]() ![]() ![]() |
So something on that belt probably. Has the belt tensioner and running gear ever been replaced?
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thehelper Member Since: 29 Jul 2018 Location: Cambridgeshire Posts: 151 ![]() ![]() ![]() |
I don't think it's the fan bearings because I cannot hear it with my head under the bonnet.
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andyk159 Member Since: 19 Nov 2014 Location: Skegby Posts: 369 ![]() ![]() ![]() |
I had a rattlly noise. Turned out to be Aircon low on gas causing pump to make noise. regassed and noise went away.
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 3219 ![]() ![]() ![]() |
Good idea from Andy.
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thehelper Member Since: 29 Jul 2018 Location: Cambridgeshire Posts: 151 ![]() ![]() ![]() |
Yes gas was low, when this noise started back in the summer. I've had it regassed but no change.
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 3219 ![]() ![]() ![]() |
Yes gas was low, when this noise started back in the summer. I've had it regassed but no change.
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thehelper Member Since: 29 Jul 2018 Location: Cambridgeshire Posts: 151 ![]() ![]() ![]() |
It could of course be the heater fan. But I can hear the heater fan running and it sounds ok. Also the noise is not changing with the speed of the fan. When the cooling fans start the noise starts. The noise also rises and falls in pitch with engine speed. |
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