Member Since: 10 Oct 2018
Location: THORNLIE
Posts: 3
Another strange engine noise question
Hi all, I searched through the forum and though there was a long list of returned results, i could not see any close to description for my queries.
I did find a video online which had a clearer sound recording of the weird noise. (not my car and credits to video owner "Simon Harding")
Situation:
The noise only appears when i start the car. Initially i thought it was due to damp and cold, so I parked it in the garage overnight and next morning the sound (sharp) is so loud I was worried it might wake the neighbours up. The sound is sporadic, i do not hear it whilst driving or idling at lights.. I was told it could be idler belt tensioner but I thought if that's the culprit, you would hear it everytime and not just when I just fired up the engine.
I recently had the timing belt, serpentine belt, pulleys (not tensioners) water pump done by an indy. I have the 2008 TDV6 which had the stronger oil pump casing.
If I can get some brain trust response, it be fantastic.. thanks in advance.
2nd Aug 2020 2:01 am
Gareth Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26699
Sounds like aux belt tensioner is failing.
2nd Aug 2020 8:02 am
garrycol
Member Since: 06 Dec 2010
Location: Canberra
Posts: 1115
Sounds all normal to me.
2nd Aug 2020 9:19 am
Gareth Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26699
There’s a budgie hiding in there! 🤣
2nd Aug 2020 9:25 am
Mr Kington
Member Since: 12 Dec 2011
Location: Scottish Borders
Posts: 1549
Mine did the same. Aux belt pulley from memory.James favourite hobby is writing in the third person.
2nd Aug 2020 9:31 am
pwheeldon
Member Since: 15 Jan 2020
Location: West Yorks
Posts: 1446
Hi, mine does the same but I need to replace the alternator and I assume its the bearing or something on the alternator. Have you checked your alternator voltage?Discovery 4 GS 2009 Auto Stornoway Grey
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2nd Aug 2020 11:37 am
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4400
One way clutch on the alternator seized, giving the belt tensioner a hard time.Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
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2nd Aug 2020 12:06 pm
pwheeldon
Member Since: 15 Jan 2020
Location: West Yorks
Posts: 1446
Is that likely to have damaged the tensioner? Is it worth getting the tensioner done as well as the alternator?Discovery 4 GS 2009 Auto Stornoway Grey
Discovery 3 s 2005 Auto Bonatti Grey Gone
Discovery 3 SE 2005 Manual Zambezi Silver Gone
Range Rover Sport HSE 2006 Black
Aston Martin DB7 VV
2nd Aug 2020 12:16 pm
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4400
Easy check, take the aux belt off the alternator pulley, and see if the one way clutch works. If it's seized, probably best change the tensioner and belt.Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
2nd Aug 2020 3:19 pm
comfyjean7
Member Since: 10 Oct 2018
Location: THORNLIE
Posts: 3
Thanks all for the suggestions... As an update, I started the engine with the fan cowl off, i could see the bottom belt tensioner vibrating as the belt moves. The top tensioner is solid, no movements at all. I uploaded the video. Is the amount of movement normal?
I also know part of the diagnosis is to take the belt off and run the engine to see if there is any sound. Now this is the silly question, If the belt and fan is left off when I start the engine, would it cause any issue to the engine? I'd imagine there be some fault codes which I am not fussed about as I have a reader to clear it later.
Also with the one way clutch on the alternator, how would I test/diagnose it? do i hand turn the alternator pulley and check for resistance or no resistance?
Thanks all again..
3rd Aug 2020 3:03 am
andtal
Member Since: 10 Mar 2019
Location: B37 5PR
Posts: 9
I dont think running with the belt off will cause any damage short term, but you'll have no power steering or cooling, so careful if you want to move it, and if you leave it running it'll over heat which can cause issues.
Im only going by mine which has been shipped off to the garage today after the aux belts come loose, with a suspected tensioner dropping its guts.... I was able to drive home, albeit with a mild steam cloud for the last half of the journey.........
3rd Aug 2020 2:38 pm
comfyjean7
Member Since: 10 Oct 2018
Location: THORNLIE
Posts: 3
Just to close this thread off.. the amount of vibration on the belt tensioner is normal. They do move a bit as in the video.
I had removed the tensioner, greased the bearings and lubricated the springs in the tensioner arm. All good now, no more chirping noise. There was no free play and the bearings aren't worn, though the bearings were dry as a bone before I packed new grease in.
To pack grease in, you have to remove the oranged colour dust cover-gasket thing, only issue is trying to fit the dust cover back in. I couldn't. So having found the culprit, I have ordered a replacement which should arrive in a weeks time.
The belt and alternator is fine. The voltage charge is normal as alternator was replaced recently and is fairly new.
7th Aug 2020 7:45 am
Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1815
I think you must be happy that the seal could not be replaced... believe me... the bearing was damaged if bone dry.... for a roller bearing one drop of oil is enough, but without that last drop, it is damaged..
If it seizes, everything damages, In the neighbourhood, maybe even the Other Belt...Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc.
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