[xj40] Accumulator / sensor leak?

1989 XJ40 with SLS deactivated properly years ago. Leak discovered
at accumulator housing (Jag Part 74661216). Hydraulic System
Mineral Oil appears to be leaking from rear most sensor closest to
accumulator. Slow accumulation of fluid around nut of sensor.

Does the sensor (?name?) have replaceable ‘‘O’’ rings or does unit
need to be replaced in whole?

Thanks for suggestions and ideas.

Matt–
Matt Z
Seattle/WA, United States
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In reply to a message from Matt Z sent Wed 27 Sep 2006:

Matt,

I don’t recognise that part number you quote - not in the
correct format to be a Jag part number (It may be a casting
number).

By ‘sensors’ I assume you mean the two pressure switches
which are screwed in to the accumulator base. One is the
‘charge switch’ JLM1562 (Yellow/black and Black/pink wire)
and the other the ‘low pressure warning switch’ JLM1563
(Yellow/red and Black/pink wire).

Each has an ‘O’ ring JLM10547 to seal it to the accumulator
base and if that is the source of your leak, easily replaced
(after depressurising the system of course).

However, the usual leak source from those switches is past
an internal seal and out where the wires enter the switch
body. For that, you need to replace the complete switch (as
well as the 'O’ring) identifying the correct replacement by
reference to the wire colours.–
The original message included these comments:

1989 XJ40 with SLS deactivated properly years ago. Leak discovered
at accumulator housing (Jag Part 74661216). Hydraulic System
Mineral Oil appears to be leaking from rear most sensor closest to
accumulator. Slow accumulation of fluid around nut of sensor.
Does the sensor (?name?) have replaceable ‘‘O’’ rings or does unit
need to be replaced in whole?
Thanks for suggestions and ideas.


Bryan N, '91 Sovereign 4.0 L, (RHD)
Cambridge, United Kingdom
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In reply to a message from Bryan N sent Wed 27 Sep 2006:

Matt,

The number you provided looks like an old Lucas number that
is stamped in the case. Bryan did supply the correct Jag
numbers.–
Ken Karr, Motorcars, Ltd., www.motorcarsltd.com
Houston, TX, United States
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In reply to a message from Matt Z sent Wed 27 Sep 2006:

Matt,

Ken’s guess that the number you quoted (74661216) may be an
old Lucas number, although incorrect, prompted me to
investigate the comments in your post a little further.

I’ve concluded that you are wrong in describing this an
‘‘Accumulator / sensor leak’’. I believe what you are
describing is in fact the ‘‘Girling Solenoid Valve Block’’,
not the accumulator.

Although my car is a later model, it did have a Girling
solenoid valve block fitted before I ripped out the SLS and
all of the associated Power Hydraulics equipment which I no
longer required because the Teves brake system fitted to
later cars provides its own brake boost.

I still have that Girling unit in my garage and having
unearthed it, lo-and-behold, the Girling part numbers on the
unit are all in the ‘‘7466xxxx’’ range. The one on the valve
block body is 74661685, the ‘‘Down Solenoid’’ is 74662408, the
‘‘Load Solenoid’’ is 74662630 and the ‘‘Up Solenoid’’ is 74661703.

Your numbers will almost certainly be slightly different to
these, but I think that is evidence that the leak you see on
your '89 car is in fact from one of the solenoids in the
Girling valve block.

The good news is that there is a seal kit which contains all
of the ‘O’ rings which you need to reseal this component.

The kit part number is JLM2058 so it should be a ‘piece of
cake’ to cure your leak.–
The original message included these comments:

1989 XJ40 with SLS deactivated properly years ago. Leak discovered
at accumulator housing (Jag Part 74661216). Hydraulic System
Mineral Oil appears to be leaking from rear most sensor closest to
accumulator. Slow accumulation of fluid around nut of sensor.
Does the sensor (?name?) have replaceable ‘‘O’’ rings or does unit
need to be replaced in whole?
Thanks for suggestions and ideas.


Bryan N, '91 Sovereign 4.0 L, (RHD)
Cambridge, United Kingdom
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Matt
I’m not sure exactly which replacement unit your car uses. I seem to
recall there was a Buick Riviera accumulator that fits your car a direct
replacement and if you do a search in the archives after removing the 1
year default using words like accumulator, GM part number and such it
should pop up with the part number and all the news you need to know.
Jay 90 VDP Majestic

Matt Z wrote:

1989 XJ40 with SLS deactivated properly years ago. Leak discovered
at accumulator housing (Jag Part 74661216). Hydraulic System
Mineral Oil appears to be leaking from rear most sensor closest to
accumulator. Slow accumulation of fluid around nut of sensor.

Does the sensor (?name?) have replaceable ‘‘O’’ rings or does unit
need to be replaced in whole?

Thanks for suggestions and ideas.

Matt


Matt Z
Seattle/WA, United States
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In reply to a message from Jay sent Wed 27 Sep 2006:

The AC Delco Buick Riviera accumulator ball does not fit
Matt’s '89 car. It is only applicable to XJ40s with the
Teves brake system.

Read the previous posts in this thread and you will note
that Matt’s problem is not with the accumulator ball itself.–
The original message included these comments:

I’m not sure exactly which replacement unit your car uses. I seem to
recall there was a Buick Riviera accumulator that fits your car a direct
replacement and if you do a search in the archives after removing the 1
year default using words like accumulator, GM part number and such it
should pop up with the part number and all the news you need to know.


Bryan N, '91 Sovereign 4.0 L, (RHD)
Cambridge, United Kingdom
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In reply to a message from Matt Z sent Wed 27 Sep 2006:

Matt Here…
The unit in question is located by the lower right front
suspention. The accumulator ‘‘Ball’’ is attached to the rear portion
of the block. Two switches are attached to the front of the block,
one upper 7466154 (Girling) and the lower switch 7466159.

The lower switch is my leak, with the ‘‘O’’ seal actually being
pushed out from under the nut of the switch. My local British auto
repair indicates that the switch contain the seal and needs to be
replaced in whole.–
Matt Z
Seattle/WA, United States
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In reply to a message from Matt Z sent Mon 2 Oct 2006:

Matt,

In that case, refer to my original reply which identified
those switches by their wire colors and gave you the part
number of the ‘O’ ring seal which can be replaced without
replacing the complete switch. However, if the switch is
leaking internally (as I mentioned before being the usual
problem where the HSMO seeps out where the wires enter the
body), the whole switch must be replaced.

I can’t identify the Girling part numbers you quote because
unlike the Girling valve block, my '91 car did not have that
type of accumulator assembly. In any event, if you do need
replacement switches, you are pretty much stuck with having
to buy them from a Jaguar parts stockist under a Jaguar part
number (which I gave you) unless you risk picking up used
items from a parts car.–
The original message included these comments:

The unit in question is located by the lower right front
suspention. The accumulator ‘‘Ball’’ is attached to the rear portion
of the block. Two switches are attached to the front of the block,
one upper 7466154 (Girling) and the lower switch 7466159.
The lower switch is my leak, with the ‘‘O’’ seal actually being
pushed out from under the nut of the switch. My local British auto
repair indicates that the switch contain the seal and needs to be
replaced in whole.


Bryan N, '91 Sovereign 4.0 L, (RHD)
Cambridge, United Kingdom
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In reply to a message from Bryan N sent Mon 2 Oct 2006:

The leak is definitely in the '‘O’'seal, the seal is partially
dislodged and visibly detaching from under the nut, the leak is not
from the wire end. The local British Auto …repair center, looked
at the full unit (pulled from the vehicle) and wants to have me
replace complete switch.

…I can not break the nut free…–
Matt Z
Seattle/WA, United States
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In reply to a message from Matt Z sent Mon 2 Oct 2006:

Matt,

Do you mean that you cannot unscrew the switch from the
accumulator base? If that is the case, how is your local
British Auto repair centre going to replace the complete switch?–
The original message included these comments:

The leak is definitely in the '‘O’'seal, the seal is partially
dislodged and visibly detaching from under the nut, the leak is not
from the wire end. The local British Auto …repair center, looked
at the full unit (pulled from the vehicle) and wants to have me
replace complete switch.
…I can not break the nut free…


Bryan N, '91 Sovereign 4.0 L, (RHD)
Cambridge, United Kingdom
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In reply to a message from Bryan N sent Mon 2 Oct 2006:

Matt,

The part number for the o-ring is JLM10547. Should cost
about $400 less than the complete switch. Jag list price is
98 cents.–
Ken Karr, Motorcars, Ltd., www.motorcarsltd.com
Houston, TX, United States
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In reply to a message from Bryan N sent Wed 27 Sep 2006:

I just went through this and the lesson learned from replacing the
switch is to make sure you get the switch with the correct wire
color and not where the switch is positioned. For example, in the
manual I have, it says that the upper switch is the charging switch
and the bottom switch is the low pressure switch but in my
application, the switches are switched around. The top switch is
the low pressure switch and the bottom switch is the charging
switch. The only way to tell is by the color of the wires. The
charging switch has a yellow wire with a black stripe and the low
pressure switch has a yellow wire witha red stripe.–
duckyboy
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In reply to a message from duckyboy sent Thu 21 Dec 2006:

That’s a very important point which has been mentioned
previously on the forum but it is worth repeating - see my
response to the original post in this thread:-

http://forums.jag-lovers.org/av.php?895089r59--
The original message included these comments:

I just went through this and the lesson learned from replacing the
switch is to make sure you get the switch with the correct wire
color and not where the switch is positioned. For example, in the
switch. The only way to tell is by the color of the wires. The
charging switch has a yellow wire with a black stripe and the low
pressure switch has a yellow wire witha red stripe.


Bryan N, '91 Sovereign 4.0 L, (RHD)
Cambridge, United Kingdom
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In reply to a message from Bryan N sent Wed 27 Sep 2006:

i replaced my charge switch and it still leaks from where it
screws into the housing…any suggestions? also can I cut
the wires and put terminals to quick-disconnect the wires? i
have a problem un screwing the charge switch, cause it
twists the wires…i’m gonna break them if I unscrew it too
much…maybe I can seal it up?–
jonathan brooks
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