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vibrations ! !

  • supergaz
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12 Feb 2012 21:31 - 12 Feb 2012 21:32 #33359 by supergaz
Re: vibrations ! ! was created by supergaz
Have you got 3 bushes per fixing? So that the bolts do not contact the chassis brackets? I think the older kits only came with 2 nylon bushes per fixing.
Last edit: 12 Feb 2012 21:32 by supergaz.

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12 Feb 2012 21:43 #33362 by mlines
Replied by mlines on topic Re: vibrations ! !
Are these low frequency vibrations or high frequency.

When it was my mounts I had a high frequency vibration that I could feel in my feet and knees through the floor.

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses

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  • supergaz
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12 Feb 2012 21:48 #33363 by supergaz
Replied by supergaz on topic Re: vibrations ! !
I got my kit in January, but went for the earlier kit. I got 9 bushes in total, so everything is seperated by a bush on on each of the 3 fixings

from the bottom up it goes bush / chassis bracket / bush / Transfer box bracket / bush so that at no point does the bolt contact any brackets.

Probs worth you giving Rob a bell and trying to get 3 more bushes.

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  • g187eev
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13 Feb 2012 02:29 #33372 by g187eev
Replied by g187eev on topic Re: vibrations ! !
Hi

There should be next to no vibration at all... Our old bush kits were a 3 part bush, but now they are two but a larger bush, still works in exactly the same way tho...

The most common cause of vibration is that the props are not aligned perfectly... it is worth double & TREBLE checking them, we've all done it, get a straight edge and hold it down the prop to be sure.

What donor props have you used? and do you have sufficient free travel on the slip yokes? (they are not fully compressed) there should be at least 30mm of free inward movement at stand still.

RB
ORA

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  • darthloachie
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13 Feb 2012 09:36 - 13 Feb 2012 09:37 #33384 by darthloachie
Replied by darthloachie on topic Re: vibrations ! !
also check the UJ's for movement and that they are well greased, and that there is not lateral play in the splines - we had a front one that had and it vibrated like mad once you got above 25mph - you couldnt tell off the jimny, only when it was mounted on the jimny and you gave the prop a shake by the splines and you could see it moving

one of the downsides of a big lift
Last edit: 13 Feb 2012 09:37 by darthloachie.

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  • darthloachie
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13 Feb 2012 16:00 #33409 by darthloachie
Replied by darthloachie on topic Re: vibrations ! !
you will get a small amount of movement in the transfer box as it is rubber mounted but any more and check the tightness of the bolts - dont overtighten as they fit into a threaded cavity in the casing and will need helicoiling if the threads are buggered
they are vunerable when offroading so I'd fit a guard as I've broken my mounts twice before I fitted one
easy to fit

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13 Feb 2012 16:21 #33410 by Obarno
Replied by Obarno on topic Re: vibrations ! !
I had a lot of vibration with my rocklobster box conversion and ORA gearbox mounts - I had the 3 piece red bushes. The problem, I think, is that the bushes are very hard and it has a bolt all the way through which inevitably will touch both the gearbox mount and chassis mount at some point. Hence vibration will be transmitted. Like you I use my Jimny a lot on the road and found it very unpleasant to drive. I had a short prop made for it between the autobox and rocklobster, and thinking there was a problem with it had it remade but the problem persisted. In the end I changed back to standard Suzuki rubber mounts and its now much better to drive with almost no vibration. So I suppose if you want strong mounts you have to put up with vibration, if you want a more smooth drive use Suzuki originals. I do carry a spare one of those with me and although I don't do anything really challenging with this car I haven't broken one (yet!)
With my French car which I use for tougher off roading I use Llama bolt through mounts which have rubber bushes (on a rocklobster transfer box) and these seem to work much better. They are nearly as good as the original mounts in terms of vibration, but of course should be stronger.

Manual VVT, 2 1/2" lift, ORA castor corrected arms, 2" ORA body lift, 4:1 transfer box, Uprated front shafts & CVs ERM , ARBs back & front 3.9 diffs, 6 point cage, ORA winch bumper - Superwinch EP9, ORA rear bumper, ORA axle truses, Diff guards ERM , TBR tank guard, Snorkel, Kumho KL71.30.9.50 15

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15 Feb 2012 14:51 - 15 Feb 2012 14:52 #33533 by ooky_123
Replied by ooky_123 on topic Re: vibrations ! !
are you using all 3 of the transfer box mounting bushes ?
I had issues when I mounted mine as the mini prop was fouling the transmission tunnel.

In the end, I reduced the number of bushes down to find the optimum



Former owner of Little "Ooky", who has now started a new life in Shetland
Last edit: 15 Feb 2012 14:52 by ooky_123.

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15 Feb 2012 15:53 #33538 by Obarno
Replied by Obarno on topic Re: vibrations ! !
Hi Ooky - I think, from your photo, that you have the bushes on incorrectly. As I understand it there should be the large bush between the chassis mount and the gearbox bracket, with one of the other mounts below the chassis mount , and one above the gearbox bracket, if that makes sense! the bolt then passes through all 3. I can see why the prop hit the tunnel as the transfer box would be mounted very high and unless you have a body lift the transfer box would have been hitting the underside of the tunnel.

Manual VVT, 2 1/2" lift, ORA castor corrected arms, 2" ORA body lift, 4:1 transfer box, Uprated front shafts & CVs ERM , ARBs back & front 3.9 diffs, 6 point cage, ORA winch bumper - Superwinch EP9, ORA rear bumper, ORA axle truses, Diff guards ERM , TBR tank guard, Snorkel, Kumho KL71.30.9.50 15

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  • bigoffroader
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15 Feb 2012 16:14 #33539 by bigoffroader
Replied by bigoffroader on topic Re: vibrations ! !
Is your input prop catching the gearbox mounts as it sounds like it

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15 Feb 2012 16:29 #33542 by ooky_123
Replied by ooky_123 on topic Re: vibrations ! !

Obarno wrote: Hi Ooky - I think, from your photo, that you have the bushes on incorrectly. As I understand it there should be the large bush between the chassis mount and the gearbox bracket, with one of the other mounts below the chassis mount , and one above the gearbox bracket, if that makes sense! the bolt then passes through all 3. I can see why the prop hit the tunnel as the transfer box would be mounted very high and unless you have a body lift the transfer box would have been hitting the underside of the tunnel.


Nope, tried that too .. that was the first setup, and the transfer box mount touched the chassis.
Ive tried every combination and this was the only one that gave me clearance on the chassis and also gave enough clearance for the mini prop

Former owner of Little "Ooky", who has now started a new life in Shetland

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15 Feb 2012 17:09 - 15 Feb 2012 17:11 #33544 by Johnniehec
Replied by Johnniehec on topic Re: vibrations ! !

Obarno wrote: Hi Ooky - I think, from your photo, that you have the bushes on incorrectly. As I understand it there should be the large bush between the chassis mount and the gearbox bracket, with one of the other mounts below the chassis mount , and one above the gearbox bracket, if that makes sense! the bolt then passes through all 3. I can see why the prop hit the tunnel as the transfer box would be mounted very high and unless you have a body lift the transfer box would have been hitting the underside of the tunnel.


I'd agree with Obarno, if either the nut or bolt is in contact with metal you'll get vibration, personally I'd go for three of these.
compare.ebay.co.uk/like/190633345733?var...ceItemTypes&var=sbar

On the 8th Day God made the LandRover -
On the 9th day he swapped it for a Jimny.
Last edit: 15 Feb 2012 17:11 by Johnniehec.

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