Vibratons on stock 318

[lilredridinghoo]

Hi there,

just come around with a problem driving me mad.

i did search the forum about vibrations but didn´t find anything similar like my problem.

engine is a stock 318 (beside a 340 intake and an 500cfm carb).

some months ago i can reg. some vibrations while slowing down the car and also that the engine was shaking in idle. i noticed that the left engine mount was gone and replaced both left and right mount, but the vibration was still there so i put the car on jackstands and looked at the tranny-mount. doesn´t looked so fine, so i replaced it.

now the vibrations have changed. no they come up when i reached 1300 rpm
if i rev it up a little they gone and come again at about 2200 rpm and so on...

i can notice them whether the car is in Drive or Park - so i don´t think it´s an drivetrain issue...

could it be an timing ignition thing ??

having a look at the balancer i couldn´t see anything worn or bad

thank´s a lot for input

btw. the car is pretty bone stock engine, tranny, drivetrain are never been touched or modified

 

[RedFish]

Had a close look at the fan ? Maybe drop the accesory belts and rule out all of those things.

 

[gerrys]

I had a vibration issue like that once...
It turned out to be dirt/mud in the crank pulley!
It must have been a slurry and when the engine was off
it all settled / dried in the lower portion of the pulley.
Once I cleaned it out the vibration disappeared.