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The mkiv Supra Owners Club

Vibration from rear of car


ewizzy

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Right, Ive got a vibration from the rear of the car........ Its seriously P**sing me off now! :( Starting to seriously stop me enjoying the experience of Supra ownership :(

 

 

I'll start with a bit of background:

 

Picked the car up and the clutch (which I already knew was shot) so I tickled it back from Reading to Rochdale drove fine, no problems apart from the clutch slipping when in 5th and 6th and putting my foot down......

 

Had the clutch replaced at a garage (apparently Japanesecar specialists - Hyper Sports and Racing). Standard toyota Clutch. Bearing in mind I was bedding the clutch in, I didnt do any drag starts or anything stupid, Just on to the slip road I gave it a bit of stick in 3rd and 4th, still tickling the clutch changes though.

On the slip road, I think I remember a small bang, nothing too amazing, and If I remember the correct sequence of events, I then felt a vibration.....I could actually be making this up though, and I felt the vibration as I went over 70mph......It was a month or so ago when it happened. I initially thought it was wheel balancing, as this was on the standard 16" jap alloys, and as I had a set of 18" nice new wheels going on when I got home, I didnt worry too much about it. :rolleyes:

 

when I got home, I changed the wheels, and then went for a drive........still happened :(

 

Now, over about 55mph, I can feel the vibration, doesnt matter what gear I am in, it seems totally speed related, specially seeing as it even happens when its out of gear, so that should rule out flywheel and engine balancing etc.

 

I would say that when in gear, the vibration does seem worse when I take my foot off the gas.

 

My thinking now is that its prop shaft related, or diff related.....

 

Has anyone got ANY ideas at all?

 

PLEASE help :(:(:(

 

Kind regards

 

Alex

 

:thanks:

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Maybe the initial 'bang' you heard was a prop bolt dropping out. Easy to check.

 

 

I checked the rear of the prop shaft where it joins the diff, 6 bolts altogether 3 in prop and 3 in diff (6 bolts going into the rubber)

 

 

How many is at the gearbox end? any ideas?

 

 

 

Thanks for the replies Ive had so far :) please, keep them coming, if you have any ideas at all, its all helpful for stuff to check :) :thumbs:

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Only trouble is, all 4 wheels have their weightss still on, and this happened with 2 different sets of wheels too, I even swapped the 18" wheels for the 16" wheels again just to see if it made any difference......Sadly, it made none :(

 

I think I am going to have to get it up on a ramp and check the propshaft etc....

 

Has anyone heard of a diff breaking and causing a similar problem? If one tooth was broken in the diff, would it be a constant noise at any speed? Or would a wheel bearing cause this sort of problem? Or even a drive shaft?

 

Thanks again for all the suggestions, and please, if you think of anything, please write your thoughts in here :)

 

Kind regards

 

Alex

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I actually had a tooth go on the diff of my MkIII Granada and my fucking god did you know something was up, it sounded like someone beating the chassis with a crowbar. So I doubt it's that.

 

Wheel bearings whine when they are on their way out, and they usually have a fade-in point of about 30mph, so it's not that either. If they had suddenly and catastrophically failed you'd know that as well (yay, Granada again)

 

However, as it's speed related and still occurs with the clutch in, I'd say a full check of the prop shaft UJ yokes, pins, bearings, the half shafts, and the diff itself perhaps would be in order... This level of mechanical stuff I'm not experienced in, you want someone like Chris Wilson to chip in :)

 

-Ian

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May be a long shot, but have you checked the rear sub frame bolts and diff mounting bolts.

 

You might try putting the car on stands and running it up to speed.

 

Have you checked with the clutch place to ask what they undid when they changed the clutch! as from thye way your post reads the two event could be connected.

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May be a long shot, but have you checked the rear sub frame bolts and diff mounting bolts.

 

You might try putting the car on stands and running it up to speed.

 

Have you checked with the clutch place to ask what they undid when they changed the clutch! as from thye way your post reads the two event could be connected.

 

 

Without saying too much, I wouldnt give that garage the wasted air from one of my old rank farts.......I asked them, and they said..."Bollox, nothing to do with us!"

 

I left it at that, safe in the knowledge that I will never ever go there again....

 

But, yeah, I think its related too :thumbs:

 

I need to get it on a ramp to properly check it out, but cant get down to my garage in Cambs for at least another 3-4 weeks. :(

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Aahh I was just wondering what short cut method they used to change the clutch. Judging by their reaction it was not a standard method.

 

The only problem with a ramp is the car is static, I think you need a dymamic test, without load the vibration my show up at much lower speeds. I have had my car on strong stands with the speedo reading over 70 mph, minus wheels, without any problems.

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Aahh I was just wondering what short cut method they used to change the clutch. Judging by their reaction it was not a standard method.

 

The only problem with a ramp is the car is static, I think you need a dymamic test, without load the vibration my show up at much lower speeds. I have had my car on strong stands with the speedo reading over 70 mph, minus wheels, without any problems.

 

 

MOT ramp with a slide jack ;)

 

 

Although, I might try doing it on stands next weekend..... :)

 

RE: that garage, I asked the guy when he was sitting down having his 2nd lunch break of the day, " How many Supra clutches have you personally changed......." his answer........ "this is my first"

 

 

:complain: When I asked Chris the owner of the garage, how many he had done, he said " Loads, not a problem"

 

They wernt even the cheapo place that I was going to take it to, I took it there as the owner has his own Supra running a big single T78 thingy, and a couple of people I spoke to recommended them (although they had only had minor stuff done there).....

 

Oh well, never mind, live and learn and all that! :rolleyes:

 

Right, I'm going to bed now the altitude up here on my soapbox is making me tired! :tongue:

 

I'll check back here in the morning though.....Thanks again for the replies, it really is appreciated :thumbs:

 

Kind regards

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In that case they may have unbolted the prop shaft from the back of the gearbox and not put it back in exactly the right place, thus unbalancing the assembly much like an unbalanced wheel. I'm not 100% on how you rectify this, either realign the propshaft flange or possibly there is some way of balancing it?

 

Give Chris Wilson a call, he'll know what to do and can probably do the job as well (properly!) :thumbs: His contact details are in his signature.

 

-Ian

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  • 4 months later...

Although the driveshft is externally balanced I have heard some anecdotal evidence that if after a clutch change you do not realign the shaft spline to the same position as before the change you may get vibration in the drive shaft. The recommendation is to mark with match up points before disassembling. Also if the center support bearing is bad or reinstalled improperly then it may also cause vibration.

 

derek

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Although the driveshft is externally balanced I have heard some anecdotal evidence that if after a clutch change you do not realign the shaft spline to the same position as before the change you may get vibration in the drive shaft. The recommendation is to mark with match up points before disassembling. Also if the center support bearing is bad or reinstalled improperly then it may also cause vibration.

 

derek

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May be of some use

But i had vibration and a clunk when taking up drive

 

It was a driveshaft CV Joint (outer)

 

But I had my whole shaft recon'd in Luton for about £120.00 just the joint only from Toyota is about £300

 

Clunk gone and vibration

 

mine isa non turbo too, so judging by what i see from TT's

 

I would say your shafts are under more strain than mine

 

And they are the same part NA or TT

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