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Old 09-07-2005, 18:01   #1 (permalink)
mathias
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volvo 940 turbo strange noise

hello

about two weeks ago my trusty volvo 940 turbo started to sound
strange. the sound, a rhythmic whirring noise, occurs only when
accelerating. I canít produce it when I just rev the engine while
standing still.
I think that instead of the (normally very soft) whining of the turbo,
I now get a sound which sounds from the outside surprisingly like an
old vw beetle or vw bus engine.
the only abnormal thing is the sound. the car accelerates and
generally behaves like before. I donít think Iím missing any power or
acceleration. nor does it consume more gas (thank heavens for that!).
a visual check of the engine compartment yields no sooty stains
anywhere near the exhaust pipes or so.
has anybody out there a clue or even experienced the same? Iím
somewhat at loss here.

thanks a lot!

mathias

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Old 09-07-2005, 20:01   #2 (permalink)
~^ beancounter ~^
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Re: volvo 940 turbo strange noise

maybe the turbo? any blue smoke at
idle?

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Old 09-07-2005, 21:01   #3 (permalink)
James Sweet
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Re: volvo 940 turbo strange noise


"mathias" <UseLinkToEmail@AutoForumz.com> wrote in message
news:1_665542_f6d544f59bf2a5e726077eeebef0e2a7@autoforumz.com...
> hello
>
> about two weeks ago my trusty volvo 940 turbo started to sound
> strange. the sound, a rhythmic whirring noise, occurs only when
> accelerating. I can't produce it when I just rev the engine while
> standing still.
> I think that instead of the (normally very soft) whining of the turbo,
> I now get a sound which sounds from the outside surprisingly like an
> old vw beetle or vw bus engine.
> the only abnormal thing is the sound. the car accelerates and
> generally behaves like before. I don't think I'm missing any power or
> acceleration. nor does it consume more gas (thank heavens for that!).
> a visual check of the engine compartment yields no sooty stains
> anywhere near the exhaust pipes or so.
> has anybody out there a clue or even experienced the same? I'm
> somewhat at loss here.
>
> thanks a lot!
>
> mathias
>



If the turbo is failing badly you generally know it, it'll sound like a
dentist's drill grinding a piece of metal. Does what you're hearing sound
like it might be an exhaust leak? You won't nessesarily get soot, those
engines run pretty clean.


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Old 09-08-2005, 06:01   #4 (permalink)
Mike F
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Posts: n/a
Re: volvo 940 turbo strange noise

mathias wrote:
>
> hello
>
> about two weeks ago my trusty volvo 940 turbo started to sound
> strange. the sound, a rhythmic whirring noise, occurs only when
> accelerating. I canít produce it when I just rev the engine while
> standing still.
> I think that instead of the (normally very soft) whining of the turbo,
> I now get a sound which sounds from the outside surprisingly like an
> old vw beetle or vw bus engine.
> the only abnormal thing is the sound. the car accelerates and
> generally behaves like before. I donít think Iím missing any power or
> acceleration. nor does it consume more gas (thank heavens for that!).
> a visual check of the engine compartment yields no sooty stains
> anywhere near the exhaust pipes or so.
> has anybody out there a clue or even experienced the same? Iím
> somewhat at loss here.
>
> thanks a lot!
>
> mathias
>
> --


Probably the start of a blown out exhaust manifold gasket. This is a
bit of a dirty job, and the studs from the turbo to front pipe and from
head to manifold like to break when you go to loosen the nuts. DO NOT,
absolutely DO NOT, try to loosen any of these nuts before heating them
cherry red.

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
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Old 09-08-2005, 09:01   #5 (permalink)
Randy G.
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Re: volvo 940 turbo strange noise

Mike F <"mikef2316()"@allsttream.nett> wrote:

>mathias wrote:
>>
>> hello
>>
>> about two weeks ago my trusty volvo 940 turbo started to sound
>> strange. the sound, a rhythmic whirring noise, occurs only when
>> accelerating. I canít produce it when I just rev the engine while
>> standing still.
>> I think that instead of the (normally very soft) whining of the turbo,
>> I now get a sound which sounds from the outside surprisingly like an
>> old vw beetle or vw bus engine.
>> the only abnormal thing is the sound. the car accelerates and
>> generally behaves like before. I donít think Iím missing any power or
>> acceleration. nor does it consume more gas (thank heavens for that!).
>> a visual check of the engine compartment yields no sooty stains
>> anywhere near the exhaust pipes or so.
>> has anybody out there a clue or even experienced the same? Iím
>> somewhat at loss here.
>>
>> thanks a lot!
>>
>> mathias
>>
>> --

>
>Probably the start of a blown out exhaust manifold gasket. This is a
>bit of a dirty job, and the studs from the turbo to front pipe and from
>head to manifold like to break when you go to loosen the nuts. DO NOT,
>absolutely DO NOT, try to loosen any of these nuts before heating them
>cherry red.


Exhaust manifold and header nuts should be cut or split using a nut
splitter for removal whenever possible. __ __
Randy & \ \/ /alerie's
\__/olvos
'90 245 Estate - '93 965 Estate
"Shelby" & "Kate"

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Old 09-08-2005, 21:01   #6 (permalink)
James Sweet
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Posts: n/a
Re: volvo 940 turbo strange noise


"Randy G." <frcn@DESPAMMOcncnet.com> wrote in message
news:g1m0i1thqp2v8hmi4bmm268v3mqa2bbttm@4ax.com...
> Mike F <"mikef2316()"@allsttream.nett> wrote:
>
> >mathias wrote:
> >>
> >> hello
> >>
> >> about two weeks ago my trusty volvo 940 turbo started to sound
> >> strange. the sound, a rhythmic whirring noise, occurs only when
> >> accelerating. I can't produce it when I just rev the engine while
> >> standing still.
> >> I think that instead of the (normally very soft) whining of the turbo,
> >> I now get a sound which sounds from the outside surprisingly like an
> >> old vw beetle or vw bus engine.
> >> the only abnormal thing is the sound. the car accelerates and
> >> generally behaves like before. I don't think I'm missing any power or
> >> acceleration. nor does it consume more gas (thank heavens for that!).
> >> a visual check of the engine compartment yields no sooty stains
> >> anywhere near the exhaust pipes or so.
> >> has anybody out there a clue or even experienced the same? I'm
> >> somewhat at loss here.
> >>
> >> thanks a lot!
> >>
> >> mathias
> >>
> >> --

> >
> >Probably the start of a blown out exhaust manifold gasket. This is a
> >bit of a dirty job, and the studs from the turbo to front pipe and from
> >head to manifold like to break when you go to loosen the nuts. DO NOT,
> >absolutely DO NOT, try to loosen any of these nuts before heating them
> >cherry red.

>
> Exhaust manifold and header nuts should be cut or split using a nut
> splitter for removal whenever possible. __ __
>


I would use that only as a last resort, it works pretty well to spray them
with a bit of P'Blaster, let it soak, and then heat them up with a mapp
torch, they normally come right off.


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Old 09-09-2005, 03:01   #7 (permalink)
Pi
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Re: volvo 940 turbo strange noise

On Thu, 08 Sep 2005 08:21:42 -0400, Mike F
<"mikef2316()"@allsttream.nett> wrote:
>DO NOT,
>absolutely DO NOT, try to loosen any of these nuts before heating them
>cherry red.


Why? Any damage expected?

Pieter

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Old 09-09-2005, 06:01   #8 (permalink)
Mike F
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Posts: n/a
Re: volvo 940 turbo strange noise

Pi wrote:
>
> On Thu, 08 Sep 2005 08:21:42 -0400, Mike F
> <"mikef2316()"@allsttream.nett> wrote:
> >DO NOT,
> >absolutely DO NOT, try to loosen any of these nuts before heating them
> >cherry red.

>
> Why? Any damage expected?
>
> Pieter


Odds are almost 100% that at least one stud will break if you try it
without heating. And they generally break below the mounting surface,
just to generate the maximum number of curses.

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
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Old 09-09-2005, 06:01   #9 (permalink)
Mike F
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Posts: n/a
Re: volvo 940 turbo strange noise

"Randy G." wrote:
>
> Mike F <"mikef2316()"@allsttream.nett> wrote:
>
> >mathias wrote:
> >>
> >> hello
> >>
> >> about two weeks ago my trusty volvo 940 turbo started to sound
> >> strange. the sound, a rhythmic whirring noise, occurs only when
> >> accelerating. I canít produce it when I just rev the engine while
> >> standing still.
> >> I think that instead of the (normally very soft) whining of the turbo,
> >> I now get a sound which sounds from the outside surprisingly like an
> >> old vw beetle or vw bus engine.
> >> the only abnormal thing is the sound. the car accelerates and
> >> generally behaves like before. I donít think Iím missing any power or
> >> acceleration. nor does it consume more gas (thank heavens for that!).
> >> a visual check of the engine compartment yields no sooty stains
> >> anywhere near the exhaust pipes or so.
> >> has anybody out there a clue or even experienced the same? Iím
> >> somewhat at loss here.
> >>
> >> thanks a lot!
> >>
> >> mathias
> >>
> >> --

> >
> >Probably the start of a blown out exhaust manifold gasket. This is a
> >bit of a dirty job, and the studs from the turbo to front pipe and from
> >head to manifold like to break when you go to loosen the nuts. DO NOT,
> >absolutely DO NOT, try to loosen any of these nuts before heating them
> >cherry red.

>
> Exhaust manifold and header nuts should be cut or split using a nut
> splitter for removal whenever possible. __ __
> Randy & \ \/ /alerie's
> \__/olvos
> '90 245 Estate - '93 965 Estate
> "Shelby" & "Kate"


Some of them, it's tough enough to get a wrench or socket on them, let
alone a nut splitter.

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
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Old 09-09-2005, 10:01   #10 (permalink)
Randy G.
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Posts: n/a
Re: volvo 940 turbo strange noise

Mike F <"mikef2316()"@allsttream.nett> wrote:

>>
>> Exhaust manifold and header nuts should be cut or split using a nut
>> splitter for removal whenever possible.

>
>Some of them, it's tough enough to get a wrench or socket on them, let
>alone a nut splitter.
>


Agreed... My comments were based not only on personal experience, but
one day I watched our transmission guy with his mechanic working on
some little POS car trying to replace a broken exhaust manifold
without removing the motor. Many of the exhaust manifold studs broke
off and the mechanic spent a day or two drilling them out of the
block.

The problem is that when trying to remove them it is difficult to feel
the difference between, "Hey! The nut just came loose!" and, "CRAP!
The stud just sheared off!" BTDT


__ __
Randy & \ \/ /alerie's
\__/olvos
'90 245 Estate - '93 965 Estate
"Shelby" & "Kate"
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