TD5 Drive Belt Tensioner

[twr7cx]

Is it common for the tension on the automatic drive belt tensioner to begin to loose it's pressure? My TD5 is squeeling from the drivebelt under hard acceleration causing it to slip.

[alien]

Not sure about loosing pressure but I have had a bearing "lock up".
I'd suggest cheacking all the belt pully bearings.

Mine had a typical belt squell just before it seazed burning through the belt.
It also broke the rubber in the harmonic ballancer at the same time.
And no it can't be run with out the belt, waterpump drives off the power steering pully and brake vachume off the alternator.

Cheers, Kyle.

[alien]

I've had simmilar noise twice.
The first time was just before an idler bearing "locked up" burning the belt and taking the harmonic balancer also.
Second time the fan support bearing in the timing case was spining in the housing.

May I sugest you check all the bearings in the serpintine belt system.
Cheers, Kyle.

Ps. sorry for the double post, having band width issues.

[sadbenn]

Just check that no bolts have come adrift from the turbo manifold and exhaust manifold this makes a squealing noise under full load dose sound like a loosed belt

[Mundy]

Mine also screeches occasionally and is comes from the a/c pulley. It usually only happens on start up, when the belt is cold and 'non sticky'. An easy check is, when it happens, to turn off the a/c and see if the screech stops.

It also happens to me when I've been off road and there's been a lot of dust. Can check this by squirting some water on the pulley and if goes away, that's the problem.

Mine's been screeching since 2007 so, I'm sure its not a bearing on the way out. Maybe my tensioner is not quite tight enough.

[Yorkie]

i was looking at mine on the weekend and noticed the tensior was moving up and down quite a bit, never noticed this before so is it normal or shoud there be no movement in that area?.
cheers

[Redback]

i was looking at mine on the weekend and noticed the tensior was moving up and down quite a bit, never noticed this before so is it normal or shoud there be no movement in that area?.
cheers

Liam no not normal, the tensioner should have tension on it all the time, actually quite a lot of tension.

Baz.

[Yorkie]

Liam no not normal, the tensioner should have tension on it all the time, actually quite a lot of tension.

Baz.

thats what i thought, maybe leading to my other issues....

[Franz]

Mine also screeches occasionally and is comes from the a/c pulley. It usually only happens on start up, when the belt is cold and 'non sticky'. An easy check is, when it happens, to turn off the a/c and see if the screech stops.

It also happens to me when I've been off road and there's been a lot of dust. Can check this by squirting some water on the pulley and if goes away, that's the problem.

Mine's been screeching since 2007 so, I'm sure its not a bearing on the way out. Maybe my tensioner is not quite tight enough.
That's what I thought too until I checked my exhaust manifold..........

[Mundy]

That's what I thought too until I checked my exhaust manifold..........

I guess the difference is that in your case it squeals at high revs and perhaps not much or at all at idle. In my case, its only when just above idle. If you run vehicle up to speed and then turn a/c back on - no screech. I assume because at higher rotational speeds the torque demand is lower.

Mundy

[twr7cx]

Just check that no bolts have come adrift from the turbo manifold and exhaust manifold this makes a squealing noise under full load dose sound like a loosed belt

You were on the money. Number 1 cylinder bolts for the exhaust manifold where almost completely out (any longer and I probably would have lost them). Number 2 were loose too.

Being a public holiday so I couldn't get a new exhaust manifold gasket I just retorqued them to 25nm specified - Rave didn't say anything about using Loctite or anything on them, but I'm wondering if that might be a good idea now.

Noise has gone, but I do want to replace the gasket at some point now.