Driveshaft centre bearing

[MINT96SS]

...how much play can there be, vertically/horizontally? Or should it be rock solid?

I'm asking 'cos I get an annoying vibration through the car at 70kph upwards, though it can be worse some days than others.
I've had the car jacked up and can feel no movement at all in the rack ends, or front and rear wheel bearings. Rims are 100% true, no dings. Tyres do have some up/down movement however. They are 225/50R16 Bridgestone RE001.

At 100-105 I can see and feel the steering wheel vibrate too, but I think that may be the tyres causing that.

The shocks are brand new too (KYB Excel G) and the top bearings there were replaced too.

Cheers

[MINT96SS]

Bump....anyone? :-)

[Not_An_Abba_Fan]

If the rubber bush isn't sagged or split it should be fine.

Check the rear uni joint. The steering wheel vibration is most likely a wheel balance issue, get the rear wheels balanced as well and see if it improves.

[VS 5.0]

I've got a similar problem.....vibration from around 80 km/h to just over 100 km/h when cruising....but also at a certain part of the rev range when accelerating. The vibration also occurs when revving the car in neutral. I can feel it right through the whole car, steering wheel, seat etc.

All of these are happening mainly b/w around 1600 rpm and 2000 rpm although there is less noticable vibration outside of this range as well.

I know the engine mounts are shot and need replacing. My mechanic thinks the harmonic balancer might also be on the way out with the combination of these two things causing the vibration.

It's booked in for a service and the engine mounts on Tuesday so will get the balancer and everything else checked then as well.

Hopefully it gets sorted because the vibration is driving me nuts ?

BTW, has recently had wheel alignment and balance and all is good so not a contrbuting factor here.

[VS 5.0]

Well, service done and replaced the following :-

Engine & gearbox mounts
Harmonic balancer
Water pump
Heater tap

Vibration is now almost non existant whether revving in neutral or driving.

While the engine & gearbox mounts were all stuffed, collapsed & or split they didn't seem to solve much of the vibration problem. The new harmonic balancer appears to have done the trick though. The rubber in the old one didn't look too bad but with 193000 kms on it it was bound to be less effective than it should be.

The car certainly drives much better now.

[Not_An_Abba_Fan]

That is why it is called a harmonic balancer. It takes out harmonic vibrations through the engine caused by inconsistent combustion in all cylinders. Also, it is almost impossible to have an engine balanced 100 percent. With everything in the engine spinning and moving it can cause vibrations felt in the car, the harmonic balancer aids in getting rid of these as well.