1986 245 making strange clutch noise

Hi,

My 1986 245 (4-speed manual with electrical overdrive) has started to
make an odd noise when I start from a stop. It's a sort of metalic
resonant sound, almost as if one were dragging a metal shovel across
pavement. The sound only occurs when I am in low revs and am getting
the car moving in first gear. The pitch of the sound is not dependent
on engine revs. It has gotten progressively louder in the past two
weeks.

I've never heard of anything like this. Any idea what this could be?

Thanks.

 

schreef:

Where does the sound come from?

I once had a similar problem with my '89 245. The sound came from the
back and after searching some hours, a friend suggested that maybe two
things touched each other. After some tries to increase the distance
between the exhaust and the rear suspension, the sound even disappeared.
Apparently, some part of the exhaust touched some part of the suspension
system when the car started to drive.

But since such a sound is difficult to describe exactly, it may as well
be something totally different... In my case, I heard the sound for
about half a second to a second when the car started to move; louder if
I accelerated faster, and when I accelerated very carefully, it even
disappeared totally.

Groetjes,

Maarten

 

"But since such a sound is difficult to describe exactly, it may as
well
be something totally different... In my case, I heard the sound for
about half a second to a second when the car started to move; louder if
I accelerated faster, and when I accelerated very carefully, it even
disappeared totally. "

Yes, that describes exactly the behavior of the sound in my car.
However, I feel like mine is coming from the front.

 

Probably the heat shield on the headpipe is loose or cracked.

Bob

 

How are the engine mounts? The engine might be shifting and causing the
fan or something else to rub.

 

Someone else suggested U-Joints... would failing U-joints cause this
symptom?

 

Could be. U-joint noises often produce steady sounds, but they certainly
experience the driveline torque and can respond to that. They are easy
enough to check that it would probably be a mistake to overlook them. I've
heard enough weird noises from U-joints that I don't doubt anything any
more.

Mike

 

Does it happen _AS_ the clutch is being let out?
If yes, then I would ask:
Does it continue _after_ the clutch pedal is released completely?

If no, then it is probably either the clutch disc or the throwout
bearing.

Can you make it happen without touching the clutch pedal (that is, if
you allow the car to slow in first gear and then accelerate again,
does the sound repeat as before)?

If yes, then it is probably some combination of one or more of:

1) Bad motor mounts or transmission mount. As they age they become
soft and distort puttiong stress on the drivetrain.

2) A rattling heat shield on the exhaust manifold or above the
catalytiuc convertor.

3) A rattling pre-heat tube off the heat riser on the exhaust
manifold.

4) A rattling inner exhaust pipe on the header pipe. This pipe which
riuns from teh exhaust manifold to the catalytic convertor is double
walled and the insulation between them eventually breaks down and
allows the inner pipe to vibrate. This can be loud. Mine vibrates at
about 2000-2050 rpm (it's like having an audible tachometer).

5) bad alternator bearings, or bent alternator mount.

6) bad accessory mount bushings (alternator, power steering, or air
conditioner compressor mounts).

7) broken, lose, or missing exhaust system mounts or clamps.

....should I keep going? ;-)





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

 

Failing U-joints tend to give you clunking when going from forward to
reverse, and often vibrations at various speeds.