lower wishbone bushes
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New bushes installed to lower wishbones, went in with relative ease, when installing sway bar I noticed the front wishbone moved about 10mm off bush.
thoughts, poor quality bushes from SJ? do I replace at more expense, add some bearing locker, also i note that washers should be installed both sides of the bush, my father did not do this, so is this a simple fix?
thoughts, poor quality bushes from SJ? do I replace at more expense, add some bearing locker, also i note that washers should be installed both sides of the bush, my father did not do this, so is this a simple fix?
- street
- Second Gear
- Posts: 157
- Joined: 20 Feb 2019
If I understand what you are asking......(assuming polybushes)
The bushes slide on the compression tube, not like the old , original rubbers. Not only is the compression tube free to rotate but also to move forward and backwards, unless washers are placed there. These need to be of a suitable thickness to avoid distortion and width to match the bush.
With washers on the turret side of the bushes, this may space out the wishbones and widen the gap at the trunnion end. You need to set up the inner end and look at the trunnion gap. In theory if you space out the inner wishbones, the trunnion gap may need spacing. In practice it depends on how straight the wishbones are .
The bushes slide on the compression tube, not like the old , original rubbers. Not only is the compression tube free to rotate but also to move forward and backwards, unless washers are placed there. These need to be of a suitable thickness to avoid distortion and width to match the bush.
With washers on the turret side of the bushes, this may space out the wishbones and widen the gap at the trunnion end. You need to set up the inner end and look at the trunnion gap. In theory if you space out the inner wishbones, the trunnion gap may need spacing. In practice it depends on how straight the wishbones are .
Last edited by 661 on Tue Jan 31, 2023 7:56 pm, edited 3 times in total.
Graeme
S4 SE
S2 GTS
Caterham 420R
Sold - Peterson JPS Exige
S4 SE
S2 GTS
Caterham 420R
Sold - Peterson JPS Exige
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661 - Coveted Fifth Gear
- Posts: 1197
- Joined: 29 Mar 2012
street wrote:New bushes installed to lower wishbones, went in with relative ease, when installing sway bar I noticed the front wishbone moved about 10mm off bush.
thoughts, poor quality bushes from SJ? do I replace at more expense, add some bearing locker, also i note that washers should be installed both sides of the bush, my father did not do this, so is this a simple fix?
I dont understand the description of your problem.
If these are standard bonded rubber bushes then I cannot visualise where the 10mm movement come from.
Unless something is seriously wrong, the bushes are a tight push fit in the wishbone eye (should not need Loctite) so if assembling the two wishbones to the lower trunnion causes a wishbone to slide sideways off the bush then something is distorted.
Ian
68 Elan S4 DHC. Built in a weekend from a kit (just like the advert said)
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Elanman99 - Third Gear
- Posts: 449
- Joined: 11 Sep 2003
As Ian correctly states the bushes should be an interference fit in the wishbone. Similarly the inner sleeve of the bush should be clamped by the fulcrum pin and Nyloc nut.
The original “Metalastic” bonded bushes are designed so that all the suspension movement is only taken by the rubber (torsional and axial).
If the bush is a poor fit in the wishbone or the fulcrum nuts are insufficiently tightened there is a danger the outer or inner sleeves rotate within their steel counter parts. This of course should be avoided at all cost.
The original “Metalastic” bonded bushes are designed so that all the suspension movement is only taken by the rubber (torsional and axial).
If the bush is a poor fit in the wishbone or the fulcrum nuts are insufficiently tightened there is a danger the outer or inner sleeves rotate within their steel counter parts. This of course should be avoided at all cost.
- Billelan
- Second Gear
- Posts: 76
- Joined: 07 Mar 2019
street wrote:the movement is sideways off the bush, original metalastic bushes, i did manage to get a better fit in press, but may look at ordering another bush...
Ignore my comment on polybushes, yours are interference fit. Don't tighten up the bolts until the car is at ride height.
Graeme
S4 SE
S2 GTS
Caterham 420R
Sold - Peterson JPS Exige
S4 SE
S2 GTS
Caterham 420R
Sold - Peterson JPS Exige
-
661 - Coveted Fifth Gear
- Posts: 1197
- Joined: 29 Mar 2012
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