Gaz adjustable shockabsorbers

[Heuer]

The parts manual has the early cars with 9.5" rear springs which were altered to 9.950" matching the chassis numbers quoted by David , 150 lb rating Maybe we have variation in todays supply of what should be standard .

Where did you get the lengths and load rating for the springs as I can find no record of them in the parts manual? Also the lengths you quoted are different from the Service manual which says 10.1" and 10.5".

[steve3.8]

Sure I have read it somewhere but apologies if I?m wrong, I will try and find it!, the 150lb spring poundage rate if I remember correctly is in Porters definitive only. Andrew, the closed to open range of measurements of the front shocks I have in my notes are:

Girling = 260mm - 395mm
Gaz = 306mm - 424mm
Range of movement on car = 305mm - 370mm
With the car stationary the shock measured 343mm

Sorry for the delay in replying , just got back from weekend away.

regards Steve

[abowie]

Many thanks Steve.

[steve3.8]

Found it , the C18977- 150lb rated spring is quoted on page 607 in Porters definitive book. Whilst searching for changes in springs these are noted in Porters Original guide

?85001? Short springs C17011 with packing ring fitted

Oct 61 ?850137? Longer springs C18977 with packing ring no longer fitted

Oct 64 --- Packing rings reintroduced .

Nov 65 -- uprated springs fitted C25939.


Looking at the SNGB catalogue and website they only list the uprated C25939 for 6 cylinder cars ?15.59 +VAT. What load rating are these ? SC Parts only list C18977 in their parts catalogue ?29.33+VAT

Andrewh - I have just read your other thread on ?rear ride height? , you say you have fitted packing rings on top and bottom of the springs , if the CMC springs are ?Jaguar? standard length and rating you do not need any packers to be factory correct with your 62 car . The parts manual states packing rings are only on top of the spring- 4 per car .

Hope this helps

Steve

[daykrolik]

David,
You wrote "Both my FHC and OTS measure ~7 3/4" from sump plug face to the floor if it is of any help." and asked for comparisons. I apologize that, since I don't always live where my E Type resides, I only just measured. My measurement is 9 inches to the bottom face of the differential case into which the plug is screwed and approximately 8 1/2" inches if you are measuring from the lowermost point of the plug itself to the floor. That's why I think my car is a bit high in the rear and am considering adjustable shocks. Perhaps I will speak to the folks at Barratt to see if they can make me feel comfortable that the Boge shocks and springs I buy from them will result in the proper height without tinkering.
Day

[Heuer]

As I have just removed the rear Koni's and installed the Boge shocks you need the following:

1. Boge shock absorber
2. Dust shield part #8688
3. Seat for top of suspension coil spring #C19820
4. Coil spring #C25939
5. Retainers for coil springs #8687 (2 supplied with Boge shock)
6. Rubber bushes in lower eye of shock absorber #8689 (2 per shock)

In addition if the body mounted bump stops have been removed to facilitate the mounting of wide wheels you must have a rubber bump stop on each shock absorber strut. The very early cars i.e. the first 500 had different springs and packing - these parts are no longer available and supersede to the later arrangement.

The springs on my recently acquired FHC are new and sourced from SNGB according to the PO's invoices. Swapping the shocks did not affect ride height obviously. So buying a set of ready made coils and shocks from SNGB should allow the car to automatically sit at the correct height.

[daykrolik]

Thanks so much, David. This is very helpful!
Day

[fbing1]

I put my first set of Konis on the front of my car, 1E12387, in the early 1990's. The car was set up as stock with Bogies. The Koni's stabilized the front sway and handling greatly. The rear was still factory stock and complaint. I was on original wheels and I believe 185/ Avons at that time. I thought it was a nice set up and not harsh. I started at the Factory Koni setting and then clicked it up a turn after a few hundred miles. For me, that was a good setting making me feel better about the front end handeling. It did "break in" and loosen up a bit. The front Koni adjustment is easy. My set up now is non standard suspension geometry, alloy 6" wire wheels, very grippy 205/15 rubber, same Koni's up front and 4 Koni's on the rear with internal bump stops. I use aftermarket springs...not over-sprung! and the springs sit atop special adjustable perches on the Koni's. I've effectively lowered the CG of the car and drive at any speed I care to over undulations and sweeping turns in control. If you do not like to really work on your Jag (that upper rear shock nut I dislike), pulling the rear shocks off can be time consuming and Koni's will need adjusting for wear over time. However, I do like the ride and have spent some time getting the desired compliant, controlled ride for the road that is not overly harsh.koni's are actually valved for the E-type...for a more controlled effect. it's better to be 'over shocked' than 'over sprung' on a road suspension. I would try some externally adjustable rear shock next time around. I believe Spax makes a dyno'd set with a multi-year warranty. We have some makes over in the US that are similar. They all wear out. So, I vote for making it easy on yourselves.

[bopperd]

I realize that this is a dead thread, but perhaps someone is still watching. I was confronted with an interesting comparison between rear springs whilst going through parts boxes in the shop tonight. On the left is one spring removed from my car, 876024. It should be C.18977, although I can find no stamping. On the right is a spring which came from a set of original Girling 64054299 shocks, C.20008.

The original spring has a winding diameter of .409", 10 5/8" tall, 3 3/8" across, and 9.5 turns. The spring on the right, which I am sure is aftermarket, has a winding diameter of .458", 10 7/16" tall, 3 7/16" across, and 10.5 turns. It is substantially beefier than the original, and would most certainly produce a taller ride height.


It is also marked with both a yellow and a blue dot.

The spacers and keepers on both sets are identical. While it is tempting to rebuild the car with the stiffer springs, I had no problem with stance previously and just might create one. I'll stick with the originals springs, and install the Girling shocks.

Dave

[Gfhug]

Dave, your comments seem to be in keeping with what has been said on here:
viewtopic.php?t=6841
The springs coming from the suppliers would appear to be different to the originals. I'm waiting to get a new set myself, but as I'm changing from Spax shocks and springs to Boge then I won't be able to compare with what an original set up should be.

[Heuer]

I have a yellow paint mark on my OTS rear springs and the ride height is perfect. According to Jaguar the springs were not colour coded whilst later cars had red code springs.

[mgcjag]

Hi David...any chance of a measurement from bottom plate of IRS to ground also quoting tyres and pressure...Thanks Steve