Yet another 348 clutch rattling noise thread

Flywheel? Is there any cluncking/rattling noise when you turn off the car? Have you got any problem in starting the car when it is well "warmed"?

 

WAG pressure plate finger

 

Happens at a stans still while not movig?

Pull The clutch and have a look it's possible you broke a pressure plate finger for exampme.no way to tell without looking. Ernie has a good thread on clutch repair. 3 bearings in there too, could be voith is dry and if so ita gonne get expensive unleass you fabricate new blocks.

Cant really tell over the internet but good sense says pull clutch to start and have a look. Easy to do.

 

If the clutch pack is good then I would pull the clutch shaft to make sure the transfer gear is properly staked to torque. When the lock ring come loose the gears bang on each other and will eat each other and be very costly. A faint noise as you describe could be you got it early and perhaps just get away with proper tightening. This was not done right at the factory. This was 1st found on the 348 challenge cars because they were run harder. Of course I'm a track guy and drive my Ferraris so I found this the hardway too. There are threads on here about the issue and me rebuilding my gearbox and then helping Ernie to rebuild his gearbox and the "Stooges" were born.

 

Yes, if the special low head flywheel bolts (those that require an M8 Ribe Bit) were replaced by standard allen bolts, the bolt heads might be contacting the housing as the clearance there is very small. To inspect these, you don't need to disassemble the clutch. Just take the whole clutch/flywheel assembly out of the housing (loosen the allen grub screw and undo the large hat-bolt) then look for any scratches on the housing.
Before taking the assembly out, you can try rotating the clutch assembly positioned as shown on your picture on the floor and listen for any faint scratching sounds. You can also try by having the clutch assembly upside down and rotating the housing while pressing down on it.
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This is the M8 Ribe Bit required for the flywheel bolts:

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like this? LOL. when I got my car, the flywheel bolts had backed themselves out....all of them...like they'd never been torqued. A light touch on the pedal and clack-clack-clack-clack!!!

fixed, serviced, and 6 years later just fine...

sjd


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That's a new one for me. I have never seen that.

 

My money was on dead throwout bearing, or maybe a broken finger....sure sounded like a really dead bearing. Opened it up, it already had the hill bearing and body inside, and all the fingers were intact. There was grease everywhere so I decided to do the flywheel service. I got it apart was was like oh.....i see...

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sjd

 

Amazing! One of the issues is these cars are decades old with many owners and many mechanics finger prints. There is a lot of bad out there added to the natural failure of these cars.

 

Whoops, mechanic forgot to torque those bolts up.

 

Is the rattle still present?
Could have checked with the flywheel off
Use earplugs ;-)

 

Travel too long = different master cilinder?
May be a good idea to change the slave seals while your in there

 

funny how everyone takes off the rear bumper. That is not needed.