Bad Vibrations Again??

DaveF · 3rd March 2010, 08:31 AM

Hi All,

I would appreciate your thoughts/suggestions/solution to my problem.
As my discovery is my daily drive for work and I travel up and down the SE Freeway every day I hate getting vibrations through the car.
Over the years I have had wheels balanced, front prop shaft rebuilt, donut replaced etc.

Now after having had some fun on some gnarly tracks in the Vic High Country I have a vibration at 95-100km/hr. So far I have:
Had the wheels balanced so its not them.
Had the front shaft rebuilt again after only 18 months - vibration still there
Removed the rear shaft and no vibration excellent, at least this has isolated the vibration. The uni joint was in good order so had the rear shaft balanced but it wasnt out very much, the donut was soft but not split so refitted donut and shaft and yep vibration again.
Removed rear shaft again and replaced donut last night with a stiffer 2nd hand one bought from the tailshaft guy for $40. Slight improvement but vibration is still there bugga!!

My thought is to buy a new donut to see if that fixes the issue but the 2nd hand one was in good nick. Could there be another cause for the vibration bearing in mind once I removed the rear shaft the vibration was gone.

I appreciate hearing your ideas.

Note: Special thanks to Jim at Adelaide Tailshaft Service, the front shaft was rebuilt for $330.00 which was cheaper than when my mechanic did it but this guy is a specialist.

Cheers
David

Tombie · 3rd March 2010, 08:54 AM

Time for a new centre bush in the rear?

Or consider a Uni-Uni tail shaft conversion.

Tombie · 3rd March 2010, 08:54 AM

Did you check the pinion bearings?

**strangy** · 3rd March 2010, 01:01 PM

You mentioned gnarly tracks. Have you hit the pinion flange/ mount bolts and warped/ bent it/ them?

**Kandy** · 3rd March 2010, 04:27 PM

Check the engine mounts- crawl under and there should be a lot of rubber between engine and chassis.
Steve

DaveF · 3rd March 2010, 07:09 PM

Thanks for the replies so far.

Time for a new centre bush in the rear? This seemed in good order no apparent movement.

Did you check the pinion bearings? Are these in the rear diff? If so vibration was there before and after rear diff was replaced.

Have you hit the pinion flange/ mount bolts and warped/ bent it/ them?
If this is on the shaft the shaft was balanced. If on the diff yes possible but did not notice any impact marks.

Check the engine mounts- crawl under and there should be a lot of rubber between engine and chassis. There is at least 1-1.5" of rubber showing on the mounts.

Thanks again for your responses any other possibilities?

Cheers
David

**Slunnie** · 3rd March 2010, 07:55 PM

I wouldn't go to a uni-uni shaft. They are more likely to induce vibration and this is the reason so many manufacturers have included a rotorflex into the driveline. The rotoflex absorbs torsional vibrations.

Another thing to check is when the shaft is out, check the output flange nut is done up tight. When this is loose it sends vibrations through the vehicle - and it can leak oil. This is the big nut in the middle of the handbrake drum. Depsite being a nylock nut it can loosen.

**jwb** · 3rd March 2010, 09:25 PM

I recall someone had a similar sounding problem in a 2a that took ages to find and turned out to be balance or something in the handbrake drum assembly. isolating the rear shaft would presumably take out the problem but the cause is not in the shaft itself.

DaveF · 3rd March 2010, 09:44 PM

Originally Posted by Slunnie

Another thing to check is when the shaft is out, check the output flange nut is done up tight. When this is loose it sends vibrations through the vehicle - and it can leak oil. This is the big nut in the middle of the handbrake drum. Depsite being a nylock nut it can loosen.

Thanks Slunnie, I did look at the nut and it was clean as, but will check to see if it is loose.

Originally Posted by jwb

I recall someone had a similar sounding problem in a 2a that took ages to find and turned out to be balance or something in the handbrake drum assembly. isolating the rear shaft would presumably take out the problem but the cause is not in the shaft itself.

I am hoping a new donut will fix the problem but yes I noticed balance drill holes on the edge of the drum so this is possible.

Cheers
David

DaveF · 9th March 2010, 08:28 AM

Howdy,

Well put a new donut in and no difference to the vibration. I did notice that there was some play in the locating shaft on the diff. Is this what you referred to Tombie2 Time for a new centre bush in the rear?

Is this easily replaced?

Cheers
David

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