Turbo squeal?

TD5mm · Mar 10, 2012

Hi all. When driving my disco from cold, whenever the turbo kicks in it makes a horrible squealing noise rather than the usual whistle. This only lasts about a minute then goes back to a whistle.

Anyone had this issue before?
Any help much appreciated.

Thanks
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johnlad · Mar 10, 2012

warped exhaust manifold, the turbo bolts to it,

TD5mm · Mar 10, 2012

So that's what causes the squealing noise?
Can it be re sealed or am I going to have to change the manifold then?

Thanks for the prompt reply

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johnlad · Mar 10, 2012

TD5mm said:
So that's what causes the squealing noise?
Can it be re sealed or am I going to have to change the manifold then?

Thanks for the prompt reply

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think it can be skimmed flat, then web between pipes ground away to stop it happening again, its more common in re mapped cars, is yours

TD5mm · Mar 10, 2012

johnlad said:
its more common in re mapped cars, is yours

No not been re mapped.

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johnlad · Mar 10, 2012

have you checked all the manifold studs are fitted and tight, dont snap them though

TD5mm · Mar 10, 2012

No not yet. Will give it a go in a bit. Thanks. Just seen the price of new exhaust manifold! Not good!

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slimbob · Mar 10, 2012

Could it be just the drivebelt slipping as the turbo boost kicks in, before you go down the manifold route ? Check tension? and put a new one on and try it then ?

TD5mm · Mar 10, 2012

slimbob said:
Could it be just the drivebelt slipping as the turbo boost kicks in, before you go down the manifold route ? Check tension? and put a new one on and try it then ?

Hi. I will check tension tomorrow although it doesnt sound like belt slippage to me. To be honest I thought it sounded like bearing seizure squeal.
I will check bolts and belt tomorrow and hopefully is one of those that's causing it.

Thanks again

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starr870 · Mar 11, 2012

This happened to mine was i convinced it was turbo untill i looked at the manifold at the bulkhead end of the manifold and could see a sooty deposit on the head.

engineer · Mar 11, 2012

Should it turn put to be the turbo give essex turbos a ring they will send you a new one plus all instructions plus packaging to send back your old one,they supprisingly dont take a deposit on the old one and the last one i purchased was £285 posted all be it some while back.

Engineer

discopaul · Mar 11, 2012

My D2 does it as well it's the exhaust manifold gasket that needs changing, it's more of a screaming whistle if it's like my cars and goes when it's hot?
I've not changed my one yet as I'm scared of snapping studs etc

TD5mm · Mar 11, 2012

Hi all. Still not had chance to check anything out yet.
Yes does sound lime screaming then goes away when warm.
Hopefully get to look tomorrow.
Thanks for all your replies.
Will report what I find

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TD5mm · Mar 18, 2012

Hi again. Have looked around the manifold and there doesn't seem to be any black dust etc around it.
Checked all bolts and they are all tight.
Might just get another gasket anyway and stick it on and see if it improves.
Cheers

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alan morgan · Mar 18, 2012

hi i had ths problem with my td5 recently convinced it was the turb so i changed the turbo . still sqealled. found there were 3 exhaust manifold nuts missing replaced them bingo no more sqealling.

lrx greg · Mar 18, 2012

u will most likley find that u have a exhaust manifold stud snapped

sparky steve · Apr 7, 2012

this noise was on mine too..
manifold warped, and snapped 5 studs
skimmed manifold and new studs and gasket all sorted now

thebiglad · Apr 7, 2012

discopaul said:
My D2 does it as well it's the exhaust manifold gasket that needs changing, it's more of a screaming whistle if it's like my cars and goes when it's hot?
I've not changed my one yet as I'm scared of snapping studs etc

Was this on the TD5 that you've just sold?

Nice

TD5mm · Apr 14, 2012

Yep you guys were right 2 manifold bolts snapped. Top and bottom back end of manifold. Can even move the gasket.
Now to get the buggers out!
Thanks for all your input

BelvoirDisco · May 28, 2013

This thread saved me a lot of grief. My TD5 developed the squeal after I discovered that the intercooler had burst.

Just on the output side where the aluminium fold over the plastic part is, the flange had cracked open and the O ring seal was poking out.

Choices..

Ebay £120 second hand
OEM £300
Upgrade £400 +
Glue £20

Fixed that with with some aerospace glue and fabricated additional new clamps, only to develop the squealing noise.

Found the problem on No. 5 outlet of the exhaust manifold. I've effected a temporary fix and doused everything in WD40 prior to ordering the parts to strip it completely in the near future.

For the time being at least, everything is working properly now.

I'm thinking of stress relieving the webbing in the casting, I reckon just grinding a slot should do it. Anyone got any pics of how they have tackled that?

TTFN

Turbo squeal?

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