squeaking noise on '88 80Q

[Huw Powell]

It doesn't sound like warbling to me.  It sounds, as far as I can tell, 
like something with a bad bearing.

Couldn't be an over-tight timing belt unless it was just installed, they 
don't tighten with age.

Time to buy a $10 stethoscope (or try using a long screwdriver handle) 
to isolate where the noise is coming from.

On 10/8/2010 2:06 PM, Joshua Van Tol wrote:
> The "warbling" noise is caused by the timing belt being too tight. Try
> loosening it a touch, and it should go away. I've heard of dealer techs
> using a technique where the water pump is installed slightly loose, and the
> belt slightly tight. Then start the engine, and use a brass drift and hammer
> to loosen the belt a bit at a time until the noise goes away. Then tighten
> the bolts on the water pump the rest of the way.
>
> I've never had the guts to try that.
>
> The clicking might be a lifter, or perhaps the vacuum pump. You can test the
> latter theory by removing the push rod for the pump and see if it still
> makes noise.
>
>
>
> On Fri, Oct 8, 2010 at 12:25 PM, Oleg Rekutin<quattro at 36hz.com>  wrote:
>
>> '88 80 Quattro 227k.
>>
>> Two videos: when running cold, almost no squeaking noise, but you can
>> start hearing it:
>>
>> http://www.youtube.com/watch?v=H1vAmZYXce8
>>
>> Idling warm, much more pronounced squeaking noise:
>>
>> http://www.youtube.com/watch?v=VHUml_wfMlA
>>
>> When the engine is revved to 1500 RPM or so, the squeal/squeak goes
>> away. It comes back when the RPMs return to idle.
>>
>> What could that noise be? Is this a pulley on an accessory belt of some
>> kind? Or is this a major engine issue?
>>
>> Also, what's that clicking noise (easily heard in the "cold idle"
>> video)?
>>
>>
>> Thanks!
>> - Oleg
>>
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-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/