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rear suspension

 
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billh



Joined: 13 Aug 2017
Posts: 5


Location: stourport on severn

PostPosted: Sun Aug 13, 2017 7:18 pm    Post subject: rear suspension  Reply with quote

As a new owner I am hoping to get some advice on lowering the rear suspension to reduce the neutral/positive camber that herald/spitfire based cars suffer from.
I plan to fit a 1" lowering block between diff and rear spring which should create around 3 degrees negative camber.
My question is, can the spring retaining bolts be accessed from under the car or will I need to cut a hole above the diff from inside the car to remove the nuts? Heralds and spitfires have an access plate, do Gentrys also have this plate and if so will it mean removing the petrol tank cover or it it inside the car?
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Paul762



Joined: 15 Jul 2012
Posts: 562


Location: Berrow, Somerset

PostPosted: Sun Aug 13, 2017 9:49 pm    Post subject: Reply with quote

Not sure if all Gentrys are the same, but my early model has an access panel inside the car, behind the seats. No need to remove fuel tank.

Paul
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twolitre



Joined: 25 Jun 2010
Posts: 1364


Location: Chesterfield

PostPosted: Sun Aug 13, 2017 10:47 pm    Post subject: Reply with quote

Without crawling under my car I cannot positively say that access will need to be through the floor but I suspect so.
 
But there is one VERY important factor which should not be overlooked.
That is that lowering the rear ride height WILL alter the rear wheel toe-in adjustment leading to accelerated tyre wear and reduction in traction on slippery surfaces.
If your chassis has no lower wishbone the toe-in will be adjusted by adding shims (easy to fabricate), or adjusting the track-arm on some Vitesses.

 This has been discussed on the forum in the past and use of the "Search" option should find it.
Jim.
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billh



Joined: 13 Aug 2017
Posts: 5


Location: stourport on severn

PostPosted: Mon Aug 14, 2017 3:35 pm    Post subject: Reply with quote

Paul762 wrote:
Not sure if all Gentrys are the same, but my early model has an access panel inside the car, behind the seats. No need to remove fuel tank.

Paul


Thanks Paul, I will take a look behind the seats and hopefully find a removable inspection plate. My car has a  very useful storage locker unit behind the seats which will need to be removed first, but once its out of the way I will be able to see whats under it.
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billh



Joined: 13 Aug 2017
Posts: 5


Location: stourport on severn

PostPosted: Mon Aug 14, 2017 3:39 pm    Post subject: Reply with quote

twolitre wrote:
Without crawling under my car I cannot positively say that access will need to be through the floor but I suspect so.
 
But there is one VERY important factor which should not be overlooked.
That is that lowering the rear ride height WILL alter the rear wheel toe-in adjustment leading to accelerated tyre wear and reduction in traction on slippery surfaces.
If your chassis has no lower wishbone the toe-in will be adjusted by adding shims (easy to fabricate), or adjusting the track-arm on some Vitesses.

 This has been discussed on the forum in the past and use of the "Search" option should find it.
Jim.


Hi Jim,

I will certainly run a 4 way aligner on the car after I do the job, I already know the front alignment is miles out, I can see masses of toe in just by looking at the car from the front. If the back is outside the suggested specification then some fettling will need to be done, the car does appear to have adjustable track control arms on the back, doubtless from a vitesse or maybe GT6 so it should be easy enough to do.

Regards,

Bill
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twolitre



Joined: 25 Jun 2010
Posts: 1364


Location: Chesterfield

PostPosted: Mon Aug 14, 2017 10:14 pm    Post subject: Reply with quote

You have foxed me with a "four way aligner". Never heard of it.
I (and others on the forum) have successfully used Dunsons Trakrite gauges. These are very simple - you just drive your car over them verify that your wheels are running parallel when in motion (toe in settings are only needed to allow for the normal "compliance" in the steering joints etc).
I reckon your front wheel toe in must be dangerous if you can see it with the naked eye! And tyre wear must be phenomenal!
A set of tyres with Trakrite setup typically lasts me over 30,000 miles and I am currently on my fourth set.
My Gentry is USED!
Jim.
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tel706



Joined: 27 Oct 2012
Posts: 692


Location: Bedfordshire

PostPosted: Mon Aug 14, 2017 11:01 pm    Post subject: Reply with quote

Bill
My 1980 bodyshell has a cut out above the diff. As per the image, although in this case you are looking at a Sierra LSD so no spring attached.



Regards Terry
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billh



Joined: 13 Aug 2017
Posts: 5


Location: stourport on severn

PostPosted: Wed Aug 16, 2017 9:13 am    Post subject: Reply with quote

twolitre wrote:
You have foxed me with a "four way aligner". Never heard of it.
I (and others on the forum) have successfully used Dunsons Trakrite gauges. These are very simple - you just drive your car over them verify that your wheels are running parallel when in motion (toe in settings are only needed to allow for the normal "compliance" in the steering joints etc).
I reckon your front wheel toe in must be dangerous if you can see it with the naked eye! And tyre wear must be phenomenal!
A set of tyres with Trakrite setup typically lasts me over 30,000 miles and I am currently on my fourth set.
My Gentry is USED!
Jim.

A 4 way aligner works on all 4 wheels at the same time, it sends a laser line around the car and checks all 4 wheels against date that has been input to the computer, it then reports on any issues, which are then adjusted and the the machine re-checks everything before printing off a clean bill of health. It measures everything, camber, caster angle, king pin inclination, tracking.
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billh



Joined: 13 Aug 2017
Posts: 5


Location: stourport on severn

PostPosted: Wed Aug 16, 2017 9:15 am    Post subject: Reply with quote

tel706 wrote:
Bill
My 1980 bodyshell has a cut out above the diff. As per the image, although in this case you are looking at a Sierra LSD so no spring attached.



Regards Terry


Hi Terry,

Thats what I am hoping to find when I remove a storage box that has been fitted in the back of my car, the previous owner seemed to think there was a hole under it when he fitted it, but wasnt really sure. Thanks for the lphoto, I know know what to expect. Cheers, Bill

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