Rattle at shutdown

Does it sound like "a box of rocks"?

Try shutting down with the clutch engaged to see if you get the same rattle.

 

It sounds like the flywheel needs to be repacked.

The rattling comes from not enough grease inside the voith flywheel and thus you can hear the guts rattling around. I would get it fixed ASAP because it can lead to your clutch burning up. The grease gets flung all over the place, you can check inside the bell housing via the inspection plate on the bottom. Shine a flash light in there and see of there are sings of grease inside. You will also want to change out the triple seals on the output shaft. Run a search of the archives, there are some diy how-to threads if you are inclined to do the work yourself. Or if you just wanna know more about what's going on.

 

OK...you're flywheel is shot. There's an o-ring inside and it's not sold as a Ferrari part. Once enough gearbox lube gets in there (because your triple seals are probably worn out) it eats the o-ring, and then it eats the Kluber grease that Ernie is referring to. With no grease to damp the relative motion between the two pieces of your flywheel, they find their way back to their rest position (at zero RPM) by chattering against each other instead of gliding smoothly through the Kluber grease. You have three choices, basically: 1) Toss your flywheel and pay about $4000.00 for a new one. 2) Call Dan at Bradan (they're an F-chat sponsor) on Long Island in New York; they will rebuild your flywheel complete with new o-ring, grease, and resurfacing for under a grand. 3) Try to do it yourself. This is NOT a good option, because, UNLIKE THE 348 FLYWHEEL, the one on the 355 is not designed to be dis-assembled. It is possible, but it will be difficult. There are several threads on F-chat which describe the process. I would not recommend doing this...by the time you're done getting it apart, finding a shop to machine and balance, finding the o-ring, and dealing with re-assembly you've already coughed up at least a grand in time and misery. Just pull your pumpkin off, put it in a sturdy container, send it to Bradan, and they'll do the rest. While it's off, replace your triple seals, replace the oil seal, clutch slave o-rings, and oil o-ring from behind the throwout bearing flange. If you went ultra-premium on this job and added a new Hill Engineering Throwout Bearing and a new clutch, you'd only be spending $2500.00 at the max...about half of what you'd spend on a new installed flywheel.

 

When shutting the engine press the clutch, that will eliminate the faint rattle you hear. My car does the same thing and my mechanic a little rattle is normal at shutdown.

 

Well what's the correct answer? Mine rattles, always had (during my ownership). Is my flywheel bad?


*******Calling all F355 owners*******

Please go out and start your engine and shut it down with the cutch engaged.

Note the presence or absence of an auditory rattle.

Repeat process with clutch disengaged.

Report back via this thread ASAP accompanied by the date of the last known flywheel repack or replacement.











And go.









P.S. 355 F1 owners need not apply, your car does not have a sufficient number of pedals.

 

Clutch pedal not pressed = rattle.
Clutch pedal pressed = no rattle
I dont need to go to my car to report back, i have known this for years. Hand on hart i have never heard a silent 355 on shut down while the pedal was not pressed. Cars with less grease rattles more than a newly packed flywheel.

 

Can this flywheel rattle be heard inside the car or only from outside whilst standing near the back of the car?

 

Rebuilt/ repacked my flywheel last year. There was plenty of grease in there when I opened it up and all the plastic parts were in perfect shape. Cleaned, repacked with correct $$ grease. Went with the recommendations here on f-chat as far as amount of grease (upper end of recommendations).

Still, faint rattle at shutdown, no rattle with clutch depressed.

As long as your pumkin is clean and grease hasn't slung out past the o-ring, I wouldn't worry.

If the pumpkin is full of grease, (indicating the grease is no longer contained in the fly wheel) then go ahead and rebuild it.
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