vibration revisited

[Albert P.]

I've taken off my driveshaft to try to isolate my vibration problem;it still exists;starts at around 1700 rpm and gets progressively worse;probable cause? clutch? If I continue to run this way can I have any contingent damage?Thanks

[John O.]

Re: vibration revisited

Hi Garth

Are you saying you get the vibration with the motor running and the drive shaft off, so that your not driving the car? If thats the case, it could be in the clutch assembly. Check all motor mounts too. Also check for dirt build up in the front pulleys...... If it is when your driving,make sure the u-joints are good. Drive shaft balanced and check your tires for OUT OF BALANCE or dirt build up on the inside of the rims.....Also if your running radial tires, check to see if a belt shifted on the tread.Just look at all the tread lines to make sure they are straight. I had that happen to me on a Monte Carlo and I had terrible vibration.

Good luck....John

[Albert P.]

Re: vibration revisited

Thanks John;yes,I disconnected the drive shaft,started the car,ran the rpms up in neutral and in gear,got the vibration both times

[Jim T.]

Re: vibration revisited

Garth couple other things to check is the balancer on your 64. I rebuilt my 64 327/300 and I put on a new balancer on that had an interference fit to get on but it did come off. Took it to a dealership to fix it since I did not have the time and they replaced my new balancer with another new one, said the one I bought was the wrong one. Also pull the trans and check the flywheel bolts, they may have become loose. If they have I would buy new ones to install and torque them correctly.

[Albert P.]

NM*THANKS FELLAS*NM *NM*

[Phil P.]

Re: NM*THANKS FELLAS*NM

when you rev up the motor exercise the clutch pedal---possible that the pilot bushing/bearing could be wallowed out causing the disc to be off center---if the vibration changes as you exercise the clutch you will be a little closer to finding the problem---phil

[Albert P.]

Re: NM*THANKS FELLAS*NM

When I rev it up with and without the clutch pedal depressed,I still get vibration.Thanks

[Jack H.]

Check for...

damaged/loose harmonic balancer + broken/loose motor mount(s) in your diagnostic efforts... Also, if you have factory original ignition sheilding installed, check the integrity of the coil wire from the ballast resistor on the firewall.

The wire 'ducks' underneath the distributor shield on its way to the coil and if it's been shortened by prior owners, it can rub against the lower edge of the shield causing the insulation to chaff producing rather random shorting of the ignition system.

[Albert P.]

Re: Check for...

How do you check the motor mounts? Visual check? Check for looseness? Thanks,I'll also be checking the harmonic balancer and ballast resistor wire.

[John H.]

Re: Check for...

Remove the fan belt to eliminate the alternator, water pump, and fan & clutch as possible contributors.