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Vibration issues again

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Vibration issues again

Postby alexthecheese » Sun Jun 13, 2010 2:20 pm

Hi guys :D

Got a MK5 2.5 turbo 1996/P reg transit bus, on a LWB chassis and 6 wheels.

Had problems before with vibration throughout the bus, which through you guys found out that the problem was to do with the propshaft. Had two centre bearings fitted and the CV joint where the prop meets the diff.

Been soundproofing the bus lately like a madman and only just started properly driving it again. Going to Glastonbury in it next week and am trying to sort everything out before we go, but after just driving it up and down the A12 with my girlfriend driving - so she can get used to it - I'm sitting further back and can hear it vibrating from underneath again.

One of the tyres is warped, a mechanic mate told me when he last looked over it a few months back. Could it be that that makes it vibrate? It's nowhere near as bad as it used to be but it's still not right, and when it hits about 40+ it starts playing up. When we cruise at 50 it's not too bad, but still there. It doesn't seem to disappear as we go faster, just gets worse.

Any ideas? Would like to try and get it sorted this week ifposs. 8)
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Re: Vibration issues again

Postby alexthecheese » Sun Jun 13, 2010 2:22 pm

Also, do I need special tyres because it's a transit? They're 185/15 c 103/102p tyres.

What does the c and 103/102p mean? Anything? :?:
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Re: Vibration issues again

Postby Altransit » Sun Jun 13, 2010 2:48 pm

A warped tyre will cause vibrations, and they can blow out so do be careful :shock:

Your tyres need to be commercially rated, that's the "C" in the size 185/15C. The 102/103 is the load rating :wink:
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Re: Vibration issues again

Postby jay » Sun Jun 13, 2010 3:20 pm

check the proshaft bolts are all tight and also check the rear wheel bearings are all ok.
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Re: Vibration issues again

Postby alexthecheese » Sun Jun 13, 2010 3:36 pm

How do I check the wheel bearings are OK? If they're not, how much do you think I'm looking at to get them replaced? Is it a fairly easy job? Might try that and then check out getting new tyres after if it's still a problem.

Will check the propshaft bolts now... haven't checked them since they were put on. Cheers.
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Re: Vibration issues again

Postby alexthecheese » Sun Jun 13, 2010 3:39 pm

Altransit wrote:A warped tyre will cause vibrations, and they can blow out so do be careful :shock:

Your tyres need to be commercially rated, that's the "C" in the size 185/15C. The 102/103 is the load rating :wink:


Yeah, it's not good I know - the guy warned about it but said it's not too bad. It might have gotten worse since then though.

Could I get away with just getting new tyres for the back axle, just 4? It sounds like it's coming from back there and not the front.

On mytyres.co.uk I can get them or about £50 a piece and up. But they're not a brand make - there's Kumho and 856's and Sava Trenta's for about £50. Would they be OK, or should I stump up more cash? Bridgestones are £83 a piece - means £332 for four as opposed to £200...
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Re: Vibration issues again

Postby alexthecheese » Sun Jun 13, 2010 3:52 pm

Centre bearings seem tight.

Could it be a case of unbalanced wheels?
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Re: Vibration issues again

Postby Altransit » Sun Jun 13, 2010 3:55 pm

It's probably only one tyre thats faulty, if you jack up the van and spin the wheels, you should be able to see it (them?)
It could even be a buckled rim, and you'll see that too :shock:
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Re: Vibration issues again

Postby alexthecheese » Sun Jun 13, 2010 8:04 pm

Altransit wrote:It's probably only one tyre thats faulty, if you jack up the van and spin the wheels, you should be able to see it (them?)
It could even be a buckled rim, and you'll see that too :shock:


Cheers mate. :) I can't jack it up myself, don't have anything that can do it, so I guess I'll have to take it to a place so they can have a look at it. The tyres look fresh, very little wear, and are less than a year old as far as I'm aware (though think they were part-worn) so if I can just get one replaced to fix it then I'll be well chuffed.

How much am I looking at for wheel bearings, if it does come to that? Any idea? :?:
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Re: Vibration issues again

Postby alexthecheese » Sun Jun 20, 2010 11:12 am

hi guys. have had dodgy tyre replaced and all four wheels at the back balanced but im still having issues when i hit cruising speed of about 50mph.
the guy said the wheels were a bit warped and not perfect, so i guess it could be that,but its starting to feel to me like its something a bit more serious than just slightly wonky wheels.
i had the propshaft off to change bearings and a cv, but now im starting to wonder if something else is up with it. or the diff? though it doesnt squeal or make any other noises. and when we slow down to 40/45 its fine, so maybe its not so serious.
any ideas? also wheel bearings to consider again!
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Re: Vibration issues again

Postby MinorMatt » Sun Jun 20, 2010 9:42 pm

50 is the perfect speed for showing up inbalanced/wonky wheels.

What I would suggest is swapping wheels around (buy a cheap trolley or bottle jack) ie. take the ones off the front and put them on one side at the back, then do the same the other side, hopefully it will show up any issues...
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Re: Vibration issues again

Postby madbri » Sun Jun 20, 2010 9:53 pm

u say uve had a new cv :?: when i replaced 1 the cup moved outwards after 500 miles or so giving me vibration! so grab ure prop and try pushing sideward on it at cv but remember to do it all 4 ways :wink: i woundnt b suprised i ended up welding a washer on each side to stop it.
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