[xj40] Green high pressure sphere

Hi there
Just a question to you experts
I have been reading a study on the XJ40 and notice in the engine
bay some cars have a small green sphere attached or near to the
brake servo and some don’t. Is this a later addition or is it
something to do with cars with self levelling? I thought that cars
with self levelling had a separate accumulator elsewhere similar to
that installed on Citroens
Thanks in advance
James–
jimfoz
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In reply to a message from jimfoz sent Mon 11 Jun 2007:

Jim,

Mmm, are you sure it’s green?

The '90 + XJ40s, have a Teves brake system in which there is
an electrically driven hydraulic pump using the actual brake
fluid for brake boost and ABS control. That stores energy in
an hydraulic accumulator near the brake servo, but that
sphere is black (at least on all of the ones I’ve seen).

It has nothing to do with the self levelling suspension
which is powered separately via the engine driven hydraulic
pump using HSMO from a separate reservoir and a Girling
valve block to control pressure to the rear shocks.

On the earlier cars, they have a Girling system which uses
HSMO for SLS and brake boost powered by that same engine
driven hydraulic pump and its accumulator is mounted low
down on the front right side chassis rail in the engine bay.–
The original message included these comments:

I have been reading a study on the XJ40 and notice in the engine
bay some cars have a small green sphere attached or near to the
brake servo and some don’t. Is this a later addition or is it
something to do with cars with self levelling? I thought that cars
with self levelling had a separate accumulator elsewhere similar to
that installed on Citroens


Bryan N, '91 Sovereign 4.0 L, RHD
Cambridge, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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In reply to a message from Bryan N sent Mon 11 Jun 2007:

I’m not sure it is green - maybe I am getting confused with those
fitted to Citroens!–
The original message included these comments:

Mmm, are you sure it’s green?


jimfoz
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FYI…I believe that the Citroens sphere will fit
the XJ40.

Peter 1989 VDP 1994 XJ6— jimfoz james@brightworld.co.uk wrote:

In reply to a message from Bryan N sent Mon 11 Jun
2007:

I’m not sure it is green - maybe I am getting
confused with those
fitted to Citroens!

The original message included these comments:

Mmm, are you sure it’s green?


jimfoz
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[forums.jag-lovers.org]–
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In reply to a message from drifter sent Mon 11 Jun 2007:

Peter,

I do not believe that is true for either the pre-'90
non-Teves cars or the '90 + cars with a Teves system which
have a different accumulator sphere.

A company close to my home are Citroen hydraulics
specialists who are sometimes able to re-charge with
nitrogen Citroen accumulator spheres (if they have good
diaphragms). About 6 years ago, they said that they could do
a similar job on Jag spheres or for �40 + VAT would machine
off the Citroen boss and weld on an M16 x 1.5 mm thread boss
to fit the pre-'90 XJ40 accumulator base. That seems to
indicate that the original Citroen unit will not fit an XJ40.

I know that at least one forum member did fit a BMW
accumulator sphere to his '87 XJ40. To do that he had to
open up the accumulator base on his car from its riginal M16
thread to M18 x 1.5 mm and modify the strap attachment to
accomodate the larger diameter BMW sphere.

Of course, owners of Teves equipped cars are better served
since you can buy a brand new German made OEM replacement in
the US from AC-direct (AC Delco P/N 25528382) for about $100
USD.–
The original message included these comments:

FYI…I believe that the Citroens sphere will fit
the XJ40.


Bryan N, '91 Sovereign 4.0 L, RHD
Cambridge, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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Bryan,

You are absolutely right. I had totally forgotten
about the different thread size. I obviously had a
senior moment !
Recently got a new sphere from Prestige in Australia
and their spheres are also re-chargable. The extra
3/4" at the end of the sphere just misses the spring
if you push it all the way forward in the clamp. Have
not had a problem with it for about eight years. This
is my second sphere.
BTW…I did not have it recharged. Am looking for a
place that will do it.

Peter 1989 VDP 1994 XJ6— Bryan N sophistic@btopenworld.com wrote:

In reply to a message from drifter sent Mon 11 Jun
2007:

Peter,

I do not believe that is true for either the pre-'90
non-Teves cars or the '90 + cars with a Teves system
which
have a different accumulator sphere.

A company close to my home are Citroen hydraulics
specialists who are sometimes able to re-charge with
nitrogen Citroen accumulator spheres (if they have
good
diaphragms). About 6 years ago, they said that they
could do
a similar job on Jag spheres or for �40 + VAT would
machine
off the Citroen boss and weld on an M16 x 1.5 mm
thread boss
to fit the pre-'90 XJ40 accumulator base. That seems
to
indicate that the original Citroen unit will not fit
an XJ40.

I know that at least one forum member did fit a BMW
accumulator sphere to his '87 XJ40. To do that he
had to
open up the accumulator base on his car from its
riginal M16
thread to M18 x 1.5 mm and modify the strap
attachment to
accomodate the larger diameter BMW sphere.

Of course, owners of Teves equipped cars are better
served
since you can buy a brand new German made OEM
replacement in
the US from AC-direct (AC Delco P/N 25528382) for
about $100
USD.

The original message included these comments:

FYI…I believe that the Citroens sphere will
fit
the XJ40.


Bryan N, '91 Sovereign 4.0 L, RHD
Cambridge, United Kingdom
–Posted using Jag-lovers JagFORUM
[forums.jag-lovers.org]–
–Support Jag-lovers - Donate at
http://www.jag-lovers.org/donate04.php

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resources including Photo Albums, Event Diary /
Calendar, On Line Books and more !

  ___________________________________________________________

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