Re: Turbo squeel

I

Ian Rawlings

Guest

• Jan 25, 2006

• #1

On 2006-01-25, [email protected] <[email protected]> wrote:

> My TD5 has developed a squeel from the turbo when accelerating. It
> started about 6 months ago, and I guess has got a little worse over
> this time. Has anyone a similar experience?

How do you know it's coming from the turbo? I ask because I've never
heard of "turbo squeal" before. Is it the same with the lights on
full beam or turned off?

--
Blast off and strike the evil Bydo empire!

 

E

EMB

Guest

• Jan 26, 2006

• #2

Ian Rawlings wrote:
> On 2006-01-25, [email protected] <[email protected]> wrote:
>
>
>>My TD5 has developed a squeel from the turbo when accelerating. It
>>started about 6 months ago, and I guess has got a little worse over
>>this time. Has anyone a similar experience?
>
>
> How do you know it's coming from the turbo? I ask because I've never
> heard of "turbo squeal" before.

It normally happens when the thrust bearing in the turbo is worn, and
happens just before the turbo smashes the compressor wheel on the
housing. I'd suggest getting it rebuilt ASAFP before the repair beomes
even more expensive.

--
EMB

 

I

Ian Rawlings

Guest

• Jan 26, 2006

• #3

On 2006-01-26, EMB <[email protected]> wrote:

> It normally happens when the thrust bearing in the turbo is worn, and
> happens just before the turbo smashes the compressor wheel on the
> housing. I'd suggest getting it rebuilt ASAFP before the repair beomes
> even more expensive.

That's what happened to a turbo in one of my cars, no squeal though,
just a horrible grating sound and no power as a vane came off after
the impact! If the OP's turbo is rubbing its bearings and has been
for a while, that's quite surprising.

--
Blast off and strike the evil Bydo empire!

 

E

EMB

Guest

• Jan 26, 2006

• #4

Ian Rawlings wrote:
> On 2006-01-26, EMB <[email protected]> wrote:
>
>
>>It normally happens when the thrust bearing in the turbo is worn, and
>>happens just before the turbo smashes the compressor wheel on the
>>housing. I'd suggest getting it rebuilt ASAFP before the repair beomes
>>even more expensive.
>
>
> That's what happened to a turbo in one of my cars, no squeal though,
> just a horrible grating sound and no power as a vane came off after
> the impact! If the OP's turbo is rubbing its bearings and has been
> for a while, that's quite surprising.
>
The squeal isn't actually anything rubbing - it's the air being forced
thru the tiny gap between wheel & housing.

--
EMB

 

I

Ian Rawlings

Guest

• Jan 26, 2006

• #5

On 2006-01-26, EMB <[email protected]> wrote:

> The squeal isn't actually anything rubbing - it's the air being forced
> thru the tiny gap between wheel & housing.

When you say "wheel and housing" do you mean the turbo vanes and the
turbo housing, and if so why doesn't that happen to a non-fubarred
turbo? Just trying to get my head around where the air is going here,
mostly for my own curiosity.

--
Blast off and strike the evil Bydo empire!

 

E

EMB

Guest

• Jan 26, 2006

• #6

Ian Rawlings wrote:

> When you say "wheel and housing" do you mean the turbo vanes and the
> turbo housing, and if so why doesn't that happen to a non-fubarred
> turbo? Just trying to get my head around where the air is going here,
> mostly for my own curiosity.

Yep - compressor wheel vanes and the housing. As the thrust bearing
wears the shaft can move axially which changes the clearance. The
change in clearance changes the pitch of the sound - not unlike changing
the note when whistling with your mouth.

IME turbos that have shown a marked increase in noise are normally ready
to do themselves a mischief. It's not too hard to use a DTI to check
the end float of the shaft if you're concerned about it either.

--
EMB