Engine vibration

[Mechdude]

Hey all, I have an NA6 long nose with 250k+km that I weekend drive.
Just recently I have noticed some harsh vibrations coming through the gear lever and dash. (Gear knob is rattling off)
Seems to be engine speed dependant.
The first buzz is around 2.5 -3, and again from 4-4.5

Engine and ignition seems to be running fine otherwise.

Likely causes?
Harmonic balancer, engine mounts?
Thoughts

Cheers
Howard


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[bruce]

Could try parking the car, lifting the bonnet, giving the engine a good rev and see whatsa shaking under the bonnet.

[ManiacLachy]

Both motor mounts and the harmonic balancer are likely to be getting on if still original. They're both made with rubber that degrades.

You could give the engine a shove side to side to see if there's play. Also the harmonic balancer by hand, but when it degrades slipped timing is usually the issue.

[93_Clubman]

have an NA6 long nose
noticed some harsh vibrations coming through the gear lever and dash. (Gear knob is rattling off)
first buzz is around 2.5 -3, and again from 4-4.5

Exhaust manifold heat sheild & the other exhaust heat sheilds are all prone to buzzing & rattling during certain rev ranges when their mounts or tabs break, but not usually to the extent of rattling the gear knob off.
There's also a dash mounting point under the pside of the dash that eventually gives way that causes vibration.
Whilst rare, the long nose 1.6 & 1.8 have been know to suffer from much the same issue as the short nose 1.6.