one more time :)

fiat218 · Post by **fiat218** » Fri Jun 22, 2012 5:25 pm

as i have posted a few times that i have a viberation at 4 thou rpms, car can be parked, we ruled out the drive line and tires. and transmission ,now maybe it the clutch pressure plate and ring gear, maybe it out of balanced, or maybe the harmonica on the crank
. i dont see how i can check the harmonica!!! or even where to purchase one
any one have any idea

narfire · Post by **narfire** » Fri Jun 22, 2012 6:51 pm

I recently fixed the vibration I had. One of the rear u-joints was not centered. I looked real close and found one of the clips was not in its recess. This 1/16th must have given me the vibration I felt. All is good now right up to 6000 rpm and 140 + kph. If the shaft is dinged that might cause a vibration as well.
Chris

rlux4 · Post by **rlux4** » Fri Jun 22, 2012 7:51 pm

I had the same problem recently with a U-joint not being centered in the yoke. It got so bad the guibo split and the tranny support bracket broke before I looked close enough to see the problem. New U-joints and driveline balance checked by a shop and it's smooth as silk.
Ron

chrisfiat · Post by **chrisfiat** » Fri Jun 22, 2012 8:23 pm

re read the op it says when the car is PARKED it vibrates

rlux4 · Post by **rlux4** » Fri Jun 22, 2012 8:29 pm

No need to yell at us. We just missed that part.
Just trying to help, excuse me.
Ron

PS: In that case I'd put my money on the flywheel balance.

fiat218 · Post by **fiat218** » Fri Jun 22, 2012 10:03 pm

rlux4 wrote:No need to yell at us. We just missed that part.
Just trying to help, excuse me.
Ron

PS: In that case I'd put my money on the flywheel balance.

car is parked. all drive train was replaced. i am betting fly wheel and clutch disk assembly was not done right, prolly to heavy side together so it out of balance, they drill hole to remove excess weight to balance, so we are thinking both pieces are not assembled right,

rlux4 · Post by **rlux4** » Fri Jun 22, 2012 11:32 pm

The clutch should be self centering with the clutch alignment tool in the disc and the bolts on the pressure plate. You're right, the flywheel is what gets balanced. So if the vibration is coming from there, it's the flywheel.
Ron

fiat218 · Post by **fiat218** » Sat Jun 23, 2012 12:06 am

rlux4 wrote:The clutch should be self centering with the clutch alignment tool in the disc and the bolts on the pressure plate. You're right, the flywheel is what gets balanced. So if the vibration is coming from there, it's the flywheel.
Ron

The pressure plate is balance too so they have to be the opposite of each other as where they lightn them up,In other words for them to balance them don,t they drill holes to make It liter if it out of balance.

rlux4 · Post by **rlux4** » Sat Jun 23, 2012 9:40 am

I know a flywheel needs to be balanced. I've never heard of a clutch that needed to be, I always assumed they came out of the box as-is. I've never raced or built hi performance engines though, so someone with that experience may know more.
Ron

Fi8spider · Post by **Fi8spider** » Sat Jun 23, 2012 9:52 am

Pressure plates should be balanced from manufacturer, I know quality ones are.

Sorry fiat218, maybe I missed something, have you had the flywheel off recently, the clutch done or has the car been in storage? Did it just start happening out of the blue?

joelbert2k · Post by **joelbert2k** » Sat Jun 23, 2012 11:14 am

You say the car is not moving. Is it in neutral or just with the clutch in?
Try running the engine up in neutral but with your foot OFF the clutch pedal and then try it with the car in gear but with the clutch pushed in.
If you have the vibration only in neutral then you probably have a bad clutch disk. Probably a piece of material broke off or something.

fiat218 · Post by **fiat218** » Sat Jun 23, 2012 2:05 pm

joelbert2k wrote:You say the car is not moving. Is it in neutral or just with the clutch in?
Try running the engine up in neutral but with your foot OFF the clutch pedal and then try it with the car in gear but with the clutch pushed in.
If you have the vibration only in neutral then you probably have a bad clutch disk. Probably a piece of material broke off or something.

i have run it moving on the road, 4000 rpm it vibs
i have sat in the drive way and ran the engine to 4000 rpms. vibs
i have push in the clutch in netural,1st thru 5th gear and vibs
so any way it done it viberates at 4000 , so maybe it the harmonic balancer, or fly wheel and pressure plate is not set together with the balance of then both

Fi8spider · Post by **Fi8spider** » Sun Jun 24, 2012 7:10 am

fiat218 wrote: i am betting fly wheel and clutch disk assembly was not done right

Yes I did miss something, sorry mate.
Was loctite or a similar thread locker product used on the flywheel bolts?

fiat218 · Post by **fiat218** » Sun Jun 24, 2012 7:52 am

Fi8spider wrote:
fiat218 wrote: i am betting fly wheel and clutch disk assembly was not done right
Yes I did miss something, sorry mate.
Was loctite or a similar thread locker product used on the flywheel bolts?

have no idea

Fi8spider · Post by **Fi8spider** » Sun Jun 24, 2012 8:09 am

When you Say harmonic balancer I imagine you mean front pulley, they are a solid one piece (no rubber bonding holding outer and inner together) unit from factory and unless they are damaged they really never go wrong.

Flywheel and pressure plate should be balanced individually and not as a unit, although it is a good idea to mark them up when removing them with the intention to replace same it really shouldn't matter in which position they are put back together because they should be individually and perfectly balanced.

Loctite on flywheel bolts? In short - Fiat never recommended the use of it on our type of Lampredi twin cam motors.

one more time :)

one more time :)

Re: one more time :)

Re: one more time :)

Re: one more time :)

Re: one more time :)

Re: one more time :)

Re: one more time :)

Re: one more time :)

Re: one more time :)

Re: one more time :)

Re: one more time :)

Re: one more time :)

Re: one more time :)

Re: one more time :)

Re: one more time :)