Help! Torsion Bar Quandry

Talk about the E-Type Series 3

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Sdinse
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#1 Help! Torsion Bar Quandry

Post by Sdinse » Sun Jan 13, 2019 9:49 pm

Has anyone else run into this? I am refitting my uprated torsion bars since they have taken on a set that leaves the front end a bit too low. They were installed new when the car underwent restoration some years ago. I'm not sure how they did it, but I am trying to follow the manual. I have the shock bolt centers set to 19.25" per the manual and the adjustment ramps at their lowest. When I try to fit the torsion bar to the front, it comes into contact with the rear lower control arm support before I can get it to align with the front fitting. The bars are specified at 0.900 and came with a rather thick powder coat that had to be sanded down to allow the reaction brackets to rotate when pushed past the splines.

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Am I doing something wrong? What did I miss? Probably something obvious, maybe I've been at this too long. :scratchheadyellow:
Steve
1971 SIII E Type 2+2

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Sdinse
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#2 Re: Help! Torsion Bar Quandry

Post by Sdinse » Sun Jan 13, 2019 10:30 pm

Does anyone know what dimension setting tool should be used for uprated torsion bars? Surely, I can’t be the first to fit these.
Steve
1971 SIII E Type 2+2

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garrycol
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#3 Re: Help! Torsion Bar Quandry

Post by garrycol » Sun Jan 13, 2019 10:42 pm

I cannot really help as mine have been in and out a number of times but many years ago - all I can say is that mine went in relatively simply and there were no obstructions and mine did not touch the wishbone. All I can suggest is that you need to look again at how you are installing these as the OEM bars fit easily.

Hopefully someone will come along and can see an obvious mistake or provide better advice than I can provide.

Good luck

Garry
1971 Series 3 E-type OTS

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lowact
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#4 Re: Help! Torsion Bar Quandry

Post by lowact » Sun Jan 13, 2019 11:31 pm

You need to feed the bar into the spline BEFORE you set the shock absorber spacing. Once the bar is in the spline it moves with the arm, can never contact. Here is a pic of my supper sophisticated shock absorber spacing tool, with notches as required to clear stuff. The 3 holes at the bottom end is because it took me three goes to achieve a level that I was happy with.
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Regards,
ColinL
'72 OTS manual V12

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Sdinse
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#5 Re: Help! Torsion Bar Quandry

Post by Sdinse » Mon Jan 14, 2019 6:51 pm

Update!

Just for the record, I had to close up the setting tool dimension to 17.5 inches before I was able to insert the torsion bars on both sides. Once they were in and indexed, I set the preload to 1 spline using the JD43 tool as directed in the procedure. Trial and error here so I'll know if this works out once I get it back down off the jackstands.
Steve
1971 SIII E Type 2+2

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lowact
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#6 Re: Help! Torsion Bar Quandry

Post by lowact » Mon Jan 14, 2019 9:49 pm

Setting tool? JD43? Golly gosh… Curiously my otherwise reliable workshop manual specifies a 49.69 cm (19.563 inch) shock bolt setting, this was too much. What I ultimately adopted was 487 mm, i.e near as dammit yr 19.25 inches but without any preload. I was then able to adjust to specified ground clearance using the cams. I am assuming I have standard (OEM) stiffness torsion bars …
Regards,
ColinL
'72 OTS manual V12

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Ole-xke1974
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#7 Re: Help! Torsion Bar Quandry

Post by Ole-xke1974 » Tue Jan 15, 2019 3:28 am

Sdinse wrote:
Sun Jan 13, 2019 10:30 pm
Does anyone know what dimension setting tool should be used for uprated torsion bars? Surely, I can’t be the first to fit these.
I did the same as you a few years ago and ended up taking the uprated TBs off the car again to reset them.
I did some drawing on paper and came up with a new distance which puts your ride height at the specified 6.25" clearance.
Based on the ride height I achieved with the originally specified length of the setting tool, I drew some circles with different setting tool lengths and found the one which is just under 19" to give me the drop of about 1", which the car sat too high.
The minimum ride height is just about 6" on my car, which I still find optically too high and If I had the time and inclination, I'd set the TBs with an other .25" shorter setting tool.
I hope this helps ........ Ole

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1974 SIII E-Type w. XJ S2 4sp w. O/D

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angelw
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#8 Re: Help! Torsion Bar Quandry

Post by angelw » Tue Jan 15, 2019 11:19 am

Colin Wrote:
Here is a pic of my supper sophisticated shock absorber spacing tool, with notches as required to clear stuff. The 3 holes at the bottom end is because it took me three goes to achieve a level that I was happy with.


Hello Colin,
I use Turn Buckles and they work well. For the units I use, I've determined a constant, that when the separation between the ends of the Left and Right Hand thread is added, gives the distance between the shock absorber mount bolts.

Best regards,

Bill

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