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Tia4



Member Since: 15 May 2012
Location: Surrey
Posts: 48
United Kingdom 1998 Defender 90 300 Tdi SW Cairns Blue
Squealing chirping noise
Just when I was beginning to think the 90 was behaving its self it's decided to start to make a strange squeal when under load does not do it all the time just comes and goes its coming from the front but not sure where any ideas or suggestions most welcome
Post #268275 21st Sep 2013 6:54am
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bpman



Member Since: 21 May 2008
Location: Oslo
Posts: 8069
2008 Defender 110 Puma 2.4 SVX Station Wagon Santorini Black
I had the same on my 300tdi, it turned out to be the front pulley tensioner, could also check the aux belt for damage
Post #268279 21st Sep 2013 7:17am
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Alex1976



Member Since: 23 Jan 2013
Location: Buckingham
Posts: 596
England 
I agree with the diagnosis of bpman - almost certainly the serpentine belt tensioner. They are about £50 for an OEM one and take about 2 minutes to change (just a 15mm nut and swap the units over) or if you want to save a few £ and take a bit of time you can buy just the bearing for about £6 and take the unit apart to swap it.
Post #268285 21st Sep 2013 8:07am
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Tia4



Member Since: 15 May 2012
Location: Surrey
Posts: 48
United Kingdom 1998 Defender 90 300 Tdi SW Cairns Blue
Thanks for the replies how would I check the front pulley tensioner?
Post #268287 21st Sep 2013 8:09am
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Alex1976



Member Since: 23 Jan 2013
Location: Buckingham
Posts: 596
England 
Take off the serpentine belt and then you can spin the tensioer pulley by hand and listen for any grumbling/sqeaking etc or see if there is any lateral movement in the pulley by holding it and trying to move it back and to. Without any load it may seem smooth and quiet - depends how bad it is.
Post #268293 21st Sep 2013 9:06am
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Litch



Member Since: 10 Mar 2013
Location: Oxfordshire
Posts: 765
England 
Sometimes even a pefectly serviceable or brand-new belt & tensioner will make the same noise.
I have had this off & on since brand-new (300TDi) and also since replacing the belt & tensioner with (genuine Dayco) replacements at service intervals. More often than not it is silent but occasionally it makes the noise especially if it has been parked up for a few days.

You can confirm if it is the belt / tensioner by the old trick of sprinkling some French Chalk or talc on the belt, if that stops it then you have identified the cause of the noise. ONE LIFE, GET IT!
Post #268304 21st Sep 2013 10:56am
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