I think my Discovery may take off?!! Help!

Now I have your attention!!For a week or so now and again but now all the time, when You rev the engine stationary or driving there is the a very loud cutting air sound. It is just like when you have your head near the radiator fan. But it is that loud in the car!!
I thought maybe a distorted fan fin, but not!!Should the fan spin on a one way bearing when the engine is off? Mine isnt. Or is it the turbo maybe? I cant see any split hoaes either!
Mystery so far!!

Sounds like it could be a air leak from turbo system, but thats my guess

inlet manifold gasket, does it sound really loud?

mine used to do 1 every 12 months until it was re tapped out and bigger threaded bolts put in, oh it was chipped though!

Yes its loud and revs up and down with engine speed! No chip though!!

Sounds to me like your viscous fan has locked up,with engine off it should spin fairly freely

I agree with Henry D. The fan should freewheel when the engine is cool (although not immediately after starting as it takes a few seconds to redistribute the fluid). Take the shroud off, start it up and after about 30 seconds try (very carefully and keeping hands etc well clear) to slow down the fan with something like a large paintbrush. You should be able to stop it - if not it's seized.

This however is better than failing the other way as mine did when it didn't lock up at all.

I have my brush out, I will eat my dinner and go and test!

I've had the same with an intercooler hose that eventually popped off mid flight!

Well my best paint brush is now my worst!! The fan did not even attempt to stop!!
So, new unit then?

Would this be ok? Viscous Fan TD5 PGG000180 Island 4x4 - Specialists in Land Rover and Range Rover Parts and accessories for all models. UK and worldwide mail order.

DaveDisco2 said:

Would this be ok? Viscous Fan TD5 PGG000180 Island 4x4 - Specialists in Land Rover and Range Rover Parts and accessories for all models. UK and worldwide mail order.

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Should be fine although it is britpart,genuine LR will be lots of songs though

HenryD said:

Should be fine although it is britpart,genuine LR will be lots of songs though

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Oh yes, over £200!!

Is it just a one way bearing in the fan?

I've not long brought a disco and mine sounds exactly the same like a Hoover on start up. The guy told me it was a whining transfer box???

DaveDisco2 said:

Is it just a one way bearing in the fan?

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No,its oil filled and as the oil heats up it causes resistance thus speeding up the fan blades

Bigjay1 said:

I've not long brought a disco and mine sounds exactly the same like a Hoover on start up. The guy told me it was a whining transfer box???

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If it does it without the wheels moving, it's not the transfer box!

Good point tombardier it does do it if you rev at standstill.any ideas?

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I put a Britpart one from Island on mine. The first one that arrived was DOA (wouldn't freewheel). The replacement arrived very promptly and was fine - been on now for about 5 months.

The only (slight) problem is that the fan blades have some very sharp edges and I cut my fingers to pieces on them.

A set of fan spanners from Ryan Wild on the D2 boys club made fitting and removing a doddle.

I have ordered one today along with a new belt and a new tensioner.
Thought I may as well do it while the fan is off!! Got it all for £99.60 from Rockingham Landrover. Hopefully I will get it done at the weekend and it will be ok!!