whistle at 1500rpm first gear on carrera 3.2

phid75 · phid75's Garage

Hi,

since 1000 miles or so a strange medium pitch whitling noise occures occasionaly just after I put 1gear and leave from a standstill.

the noise is not present at idle, and disappears right after the the clutch is totally released and the car is moving at 1500rmp or more. It doesn't occures on any other gear, thoug I suspect the whistle is still there, but very attenuated.

the whistle is occasional, but I think it's more frequent when the car is cold. For exemple, I always hear it in the morning, when I put 1gear after starting the engine, as I leave the parking lot.

My first guess it the alternator, but it has already been rebuild a year ago.

Any suggestion ?

dean · 10-19-2003, 04:55 AM

If it goes away when you push the clutch in I would say it is in the tranny or the throw out bearing. I doubt it is the alt.

cary · 10-19-2003, 05:44 AM

Check the belt .............mine does the same thing.
It's the sound of power...............LOL.
I can't seem to get it to go away forever. But it does it more when its below 50 degrees. I even changed the pulley.

The one other thing is the belt size.
I think the pulley was designed for a 10mm belt and all you can get is 9.5mm. Or its vice versa. That's what a attribute mine to.

Tinker with the tension on the belt and you'll hear a difference.

bell · bell's Garage

throw out bearing is my guess.......
how many miles are on your clutch?

phid75 · phid75's Garage

the car is 100k miles, the clutch has been changed once but I don't know when, at least 40k miles away anyway.

the car has been serviced recently, and the belt is new and tension good.

once precision : the whistle doesn't disappear when I press the clutch, but when the car actually is on the torque, moving from a stand still.

cary · 10-19-2003, 11:15 AM

Putting a load on it, brings it on.

Tinker with the belt shims and hear the difference. I'd tell you to spray it with belt dressing. But that s*** is the messiest thing I've ever used.

RoninLB · 10-19-2003, 12:23 PM

Quote:

Originally posted by cary
[B. I'd tell you to spray it with belt dressing. But that s*** is the messiest thing I've ever used. [/B]

brake fluid also works

cary · 10-19-2003, 01:06 PM

Really, what does it do ? Swell it up ? Or rough up the edges ?

RoninLB · 10-19-2003, 01:23 PM

Quote:

Originally posted by cary
Really, what does it do ? Swell it up ? Or rough up the edges ?

no hard info answers..
if may not last forever like the belt dressing......Ron

Lucky · 10-19-2003, 01:57 PM

Brake fluid is also a great paint remover... don't put it anywhere other than inside your braking system!!!

Mine whistles too, just started. Figured it was an intake system leak, but maybe it is just the belt. My belt also rumbles at times... if I spray WD40 on it, the noises dissappear for a (short) while. Other than belt dressing, your only other option is to change the belt... they are pretty cheap and the new one will be quiet for a while.

phid75 · phid75's Garage

Quote:

Originally posted by Lucky
Other than belt dressing, your only other option is to change the belt...

but the belt has been changed, and it hasn't changed the whitsle in any way ?!

Lucky · 10-20-2003, 03:37 AM

Does the whistle change in pitch or volume with throttle position? If so, you may have a vacuum leak in the intake system.

What year is your car?

phid75 · phid75's Garage

Quote:

Originally posted by Lucky
Does the whistle change in pitch or volume with throttle position?

no, the sound is the same.

It's a rather metallic sound, like 2 plates a bit loose that would touch and resonnate.
Throughout bearing as some suggested ?

What year is your car? [/B][/QUOTE]
The car is a Euro 1986 carrera

Lucky · 10-20-2003, 07:37 AM

A couple of suggestions...

1) it will help the diagnosis if you can get a better idea of where the noise appears to be coming from... I realize that is a hard thing to do with the way sounds bounce and resonate around in cars. But, if it feels like the sound is coming from below the rear seats, then I'd concentrate on clutch, CVs, and wheel bearings. If it seems to be coming from higher up the firewall, then maybe it is the alternator bearings or the heater blower motor bearings.

2) try adjusting the clutch cable to spec and see if that changes or eliminates the noise. It could be that with wear of the clutch your throw-out bearing is just grazing the pressure plate release mechanism (even with the pedal fully released).

From what you've described so far, I'd start with #2 and see if that has an effect.