XJ6 1978 S2 ride heigh problem
 

Jaguar used packers under the front springs to "adjust" the ride height.

Messy, hell yes, and time consuming.

Add to that equation, that "new" springs are usually bit exactly the same as the OE of the 1970's.

ALL the blah, blah, blah about them made to OE spec etc is not always fact.

I have nothing but issues with "new" springs over the years, and usually ended up at a wreckers (breakers) and hunted down a pair from another car, and fitted, and the whole thing simply fell into spec.

We dont have much issues with springs down here, but clearly, from what I have read over the years, you guys do, salt etc I suppose?

If you have fitted the packers, some need to come out, and I have long forgotten the formula that applies to packer thickness versus ride height variation.

Some years ago my series 1 was really sagged at the front, so much so that the car only looked right with both tanks full and another 100lbs in the boot. So I bought some springs from a suspension place that were supposed to restore to the correct height. They also had on offer stiffer springs that would increase height 25mm. Put the standard springs in and ride height was 585mm at the lights. Took them off, returned them for the stiffer springs. Car rides at 622mm (R) and 626mm (L), still a bit high but better than scraping on the kerbs. So I assume your springs are way too stiff.
Grant - can you just confirm that adding a shim (they are 3mm plastic) will INCREASE the ride height (I think it is 8mm) and vice versa?

Drive it for a few days. Give it a chance to settle. Then if the springs feel ok and they arent v12 springs add spacers and longer bolts to the lower spring plates to achive the ride height you need.
.

Yeah, when you see a listing showing a single part part number for a spring that Jaguar used 5 or 6 different variations of, you know something ain't right !

Over the years I've determined that getting correct ride height with new springs is maybe a 50-50 proposition at best.



I did the same on my latest project


It's roughly a 3:1 ratio. One .125" spacer yields a .375" difference in ride height.

I'm not sure spacers/packers will account for a full 2" height problem. They're designed for 'trim'/adjustment, not compensating for gross deviations.

Cheers
DD

Yeah, sometimes they do settle a bit.

I also wonder if the springs are fully seated at both ends....although the way the seats are designed they really should sort of guide themselves properly home.

Cheers
DD

I agree Doug, and not a 5 minute task to R & R springs as a trial and error thing.

That spring makers "one size fits most" is getting way too common.

Probably V12 springs at a pinch.

Doug has answered the formula and its sound sort of familiar, its been a very long time since I messed with them.

Yeah, I agree.

When there's a problem the complaint always seems to be "too high" rather than "too low". So I'd guess that the spring makers, in their one-size-fits-most approach, are making the springs taller and stiffer to accommodate V12s.

Cheers
DD

Wrong springs or badly made ones ! I had to replace a set way back in the early 90s because they have a tendency to break about an inch off the bottom end and this is a failure on our UK roadworthiness test (MOT Test). My car did ride a bit higher afterwards, but eventually settled down a bit,but a 2" difference is obviously wrong, way out wrong.

Ride height
 

Just lowered my S1 about two inches with 1/2 inch spacers between the pan. Headlights will be WAY out of useful height!

Suspension
 

Graham
Measured mine today, never did any changes to my car since 78.
The front is 27 3/4, the rear is 24 1/2 .

I think my rear could use a boost, I have a set for the rear to be put in.

Walter

Ride height
 

I put the original V12 springs back in and with a lighter 350 Chev it still is not as high as yours. There was a 50mm diff in height in the 2 different sets of springs and that 50mm turned into a 110mm difference on the car.

Gentlemen, I have been following your discussion with great interest as my 1979 S3 sits too high. But a more basic question is what is the correct height and how do you measure it? I have seen comments about measuring to the center of the headlights but the bumper sticks out so far the measuring tape is a long way from the headlight. Is there a definitive target measurement to the top of the front wing (fender) wheel arch? Are S1, S2, and S3 all the same? Sorry to hold up your discussion with such a basic question but I think a lot of us are looking for help on this. Thanks

Perfect. Thank you very much for posting this page. I am going to print it out and put it in my Jaguar book. Thanks again!

I'll add that my Series III ROM shows the same spec....611mm

Cheers
DD

I had no packing rings in my S1, did not want to try replacing the springs.. too many others had higher than normal results by changing them out.. King springs seem to be made out of spec?

So I added (tried 1/4" spacers first) 1/2 steel spacers and used 1/2 longer Grade 8 bolts, washers and nuts. There are two sizes, longer ones in the front that hold the shock mounts and the shorter ones on the sides. I just loosened the front ones and the ones on one side, then removed a side one to gain the needed room for the spacer.. replaced that bolt and then did the rest on that side.. repeated for the other side.

One photo shows the half inch spacers installed. the other the results with only 1/4 inch spacers. Car is now at correct height and I then adjusted the headlights to aim properly!!!

Hi Roger, I'm glad I found this old post on ride height. I am rebuilding all (4) corners of my 1985 S3 and just got the first corner put back together tonight. The car had no engine when I got it and it appears that everything that I've taken apart is original. I did not replace the springs and I have read on this forum and others that the LT1 is lighter than the original 4.2 DOHC, but I don't know by how much (one suggestion is 30lbs). I removed the (2) 1/8" packers and used 1/4" spacers on the spring pan. I have seen one formula that says 1/8" at the spring is about 5/16" at the hub. If so, I'll be about 1-1/4" lower. What are your thoughts on my decision?
Dave