A palaver - Jag IRS removal

[drammyboy]

Anyone else find it an issue with the XJS rear axle on the Cobra kit?

Inner fulcrum tubes nuts submerged/hidden
in the rear chassis long tubes?
Dropping the diff requires removal of the bottom arm nuts/shafts/washers.
I see some cars don’t use a bottom plate to support
the fulcrum bracket castings.

Those smart old timers/engineers designed a simple
Lightweight cage that dropped the lot out with ease.

Drop the chassis over the Jag IRS


Bolt in the diff with bottom arms attached


Tie plate to cage it all together

[GDCobra]

Anyone else find it an issue with the XJS rear axle on the Cobra kit?

Inner fulcrum tubes nuts submerged/hidden
in the rear chassis long tubes?
Dropping the diff requires removal of the bottom arm nuts/shafts/washers.
I see some cars don’t use a bottom plate to support
the fulcrum bracket castings.

Those smart old timers/engineers designed a simple
Lightweight cage that dropped the lot out with ease.

Drop the chassis over the Jag IRS


Bolt in the diff with bottom arms attached


Tie plate to cage it all together

On the GD there are angle brackets which bolt to end of the fulcrum pins front and rear, these then bolt onto the chassis which "wraps" over the diff' which also has a mount for the 4, taper seat, bolts at the top of the diff. Not too different from your diagram. Easy enough when the body's not on.

[ChrisP]

Interesting. Yes, they are a total pain to get out. I have to take the fuel tank out of mine too. None of it easy without a decent lift. All heavy too. Then getting those four bolts back in on the top - aaaaaaaargh. Thankfully, it's not something you have to do too often.

But there again, if any of us wanted an easy life we would be buying something other than a cobra!

[jon1d]

The Dax does not use the bottom plate for the XJ/6 and XJS donor but a spreader plate at the rear joining the two fulcrum shafts for support.

To remove the diff you do need to drop the fuel tank to give you access as you need to pull the diff further back before it can be dropped.

Making up a cage out of wood helps to support the nose of the diff stopping it twisting and using two trolley jacks.

I am not sure what benefit would be achieved if the original Jaguar cage support was used as it adds a lot of weight and is bulky so fabricating a support on the bottom plate might give you less ground clearance.

The diff rarely needs to be dropped, only for brake callipers or diff overhaul work. Access and inspection holes give you access for most jobs brake pads or handbrake adjustment.
I fitted a remote bleed nipple take off to make brake bleeding easier.

[dave]

You could just undo the nuts on the front of the fulcrum shafts, and the 4 bolts in the top of the diff and the shock bolts. Then wriggle it back by around an inch and a half then lower the whole lot down.