355 Horrible vibration

First let me ask you this. At 4K rpm during vibration... what happens if you put it in neutral and let her coast? Vibration? This will help determine if it's in the engine or running gear...

 

Take it to a qualified mechanic (not where you went) and have it inspected on a lift. Most shops will inspect it for free and tell you if the mount is broken. Or go back to the 1st guy and get your money back.

Could be a mount, more vibration under load, etc.

BTW - I'm surprised this guy went right to your throw out bearing. Usually, an early sign of it going bad is when you turn off the car in neutral, there is a shudder right after shut down. If you do the same thing, but shut it off with it in gear with the clutch depressed and don't hear the shutter. That's usually the symptoms for a throw out.

 

Could be a wheel bearing. Cut the engine off and put it in neutral. If you still feel it look at the wheel bearings. I had that happen in my 98. good luck.

 

Question:

Was the Flywheel serviced recently?


Regards, Jim

 

I ask because if it was, It may be the problem of the vibration if not serviced correctly.

The flywheel is self balancing with weights inside suspended in grease. If it was serviced and repacked with grease, it may just need time to balance itself, but if the vibration continues, there may be an internal problem with the flywheel.

best regards, Jim

 

good luck

regards, jim

 

There are two mounting points for the engine. Since the 355 subframe is almost the same as the 348, the motor mounts should be in the same place. You can actually see them from behind the car looking up underneith. They are located just under the exhaust headers. You will see a bracket coming off of the subframe were the bottom of the engine mount gets bolted to. There is one very big bolt holding the mounts to the subframe, and then there will be a triangle shape attatched to the bottom sides of the engine, with three bolts holding it in place. It also could be that the main bolt that is holding it the subframe has come loose. But that is very unlikely, unless someone was fooling around with the nut. I don't know but these guys seem like they don't know what they are doing. That or they are trying to rip you off. It is very easy to loosen the motor mount bolt that attatches to the subframe. They could have done this and then try to charge you for a new motor mounts, plus labor. Then all they would do is just retighten it, and make some easy money. Now I hope that I am totally wrong in saying that. You can check yourself if the motor mount is truley broken. Have someone rev the egnie while you are looking at the engine mounts. If they are broken you will see the crack when the engine is rev'd. If it is loose you will see the motor mount move up and down on the subframe. If it is indeed cracked then you can have it changed. If it is loose then tighten it up.

 

Excuse my cynicism but....with cars of this value, isn't incompetance almost the same as theft?


Tom (card-carrying curmudgeon)

 

So was it a motor mount problem after all?

 

He hasnt posted in a year and a half, probably not on here anymore. But the fact the mechanic got the vibe to go away by working on the clutch would seem to point to a clutch issue somewhere wouldnt it?

 

Agree with Paul.. This is not an engine mount issue. I have started 6 and 8 and 12 cylinder Ferrari engines on the floor or on a stand, and you could balance a nickle on the engine while running. They are dead smooth, without a hint of vibration, without being bolted to anything. A bad engine mount won't make the engine vibrate.

Jim S.