[xj] V12 throttle linkage bushing replacement

The nylon bushing on the LH side throttle linkage is broken,
causeing the car to nearly stall when I first press on the
accelerator.
I want to fix this myself as it (presumably!) doesn’t
require me to get under the car!

This looks very simple, but the shop time disagrees. Will I
need special tools or an extra elbow joint to do this?

I’m not completely incompentent mechanically, but whenever I
try something involving lots of disassembly (e.g. removing a
radiator) I can never get it back togethor…

-Chris
1989 V12 VDP–
Chris Los 1992 V12 Vanden Plas #51
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Chris, I’ll pass this to our local V12 guys, some of whom have done this.–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

thetopdogg wrote:

The nylon bushing on the LH side throttle linkage is broken,
causeing the car to nearly stall when I first press on the
accelerator.
I want to fix this myself as it (presumably!) doesn’t
require me to get under the car!

This looks very simple, but the shop time disagrees. Will I
need special tools or an extra elbow joint to do this?

I’m not completely incompentent mechanically, but whenever I
try something involving lots of disassembly (e.g. removing a
radiator) I can never get it back togethor…

-Chris
1989 V12 VDP

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In reply to a message from thetopdogg sent Tue 5 Feb 2008:

To clarify:
I am referring to part # C34388, which is a black double-
lipped nylon bushing which fits into part # EBC3624
(’'Throttle linkage bracket-LH( which is of course bolted to
the back of the inlet manifold.

It looks like I should be able to slide the bushing on the
linkage shaft from the back and then squeeze the front lip
of the bushing through the opening in the throttle linkage
bracket.

However, Kirby Palm lists several different methods, all
involving removing lots of tiny pieces.

-Chris
1989 V12 VDP–
The original message included these comments:

The nylon bushing on the LH side throttle linkage is broken,
causeing the car to nearly stall when I first press on the


Chris Los 1992 V12 Vanden Plas #51
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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Chris: as far as I know this is a very simple and straightforward
replacement, and the bushings are very inexpensive.

Gregory
1966 Mark 2 3.8
1992 Series III V12 Vanden Plas (#92 of the last 100)
2002 X-Type
2004 XJ8 4.2-----Original Message-----
From: owner-xj@jag-lovers.org [mailto:owner-xj@jag-lovers.org] On Behalf Of
thetopdogg
Sent: February-05-08 11:35 AM
To: xj@jag-lovers.org
Subject: [xj] V12 throttle linkage bushing replacement

The nylon bushing on the LH side throttle linkage is broken,
causeing the car to nearly stall when I first press on the
accelerator.
I want to fix this myself as it (presumably!) doesn’t
require me to get under the car!

===================================================
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In reply to a message from thetopdogg sent Tue 5 Feb 2008:

Hi, my advice is if you are going to do it yourself follow the XJS
book, it really is good.

This was how I did my XJS V12, when the bushes went. I disconnected
the short link with a ball joint at each end that went from the
bellcrank to the spindle.

If I remember right there is a small circlip that holds the
spindle, and stops it moving in and out…which is very easy to
lose. If you remove it, and remove the little clip off the other
end that actuates the throttle itself, you should be able to either
remove or move the spindle to get the old bush out and the new one
in.

After this though, you might have to reset all the linkages, as
putting a new bush might upset the settings.

Good Luck!!

Ric–
The original message included these comments:

It looks like I should be able to slide the bushing on the
linkage shaft from the back and then squeeze the front lip
of the bushing through the opening in the throttle linkage
bracket.
However, Kirby Palm lists several different methods, all
involving removing lots of tiny pieces.


Rich W
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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In reply to a message from Dr. Gregory Andrachuk sent Tue 5 Feb 2008:

Inexpensive must be meant in a ‘‘relative to other Jaguar
parts’’ because the dealer has 10 in stock, at $14.00 each.
This suits me, as it would likely not be worth the effort (and
gas money) to hunt down an identical part at the more
appropriate $0.75 price point :slight_smile:

I’ll try jamming it in with a needle nose pliers, and if that
doesn’t work I’ll start loosening things until it fits…

Thanks for the quick response.
-Chris–
The original message included these comments:

Chris: as far as I know this is a very simple and straightforward
replacement, and the bushings are very inexpensive.


Chris Los 1992 V12 Vanden Plas #51
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I wasn’t able to do that…but it really was not a big deal to take
it apart just far enough to get the replacement in there, even on the
port side which has the aav on there to complicate things.
(Just do it and replace it immediately so you don’t have little
pieces laying around to drop…it helps if somone helps you because
it takes three hands now and then.)
In fact the one on that side needs replacing again, but I think it is
from spraying stuff on the aav to keep everything loose.It would not
be a big project to make some up that are more durable…but quicker
for me, in Alaska, to just order one and put it on.
It is rubber (or neoprene ??) which makes it easier to squidge into
place…
Been putting it off so this will get me off the dime !
Good luck (because that beats skill anyday !)
Bill
'86 v12 vdp
AlaskaOn Feb 5, 2008, at 11:21 AM, thetopdogg wrote:

In reply to a message from thetopdogg sent Tue 5 Feb 2008:

To clarify:
I am referring to part # C34388, which is a black double-
lipped nylon bushing which fits into part # EBC3624
(’'Throttle linkage bracket-LH( which is of course bolted to
the back of the inlet manifold.

It looks like I should be able to slide the bushing on the
linkage shaft from the back and then squeeze the front lip
of the bushing through the opening in the throttle linkage
bracket.

However, Kirby Palm lists several different methods, all
involving removing lots of tiny pieces.

-Chris
1989 V12 VDP

The original message included these comments:

The nylon bushing on the LH side throttle linkage is broken,
causeing the car to nearly stall when I first press on the


Chris Los 1992 V12 Vanden Plas #51

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In reply to a message from Rich W sent Tue 5 Feb 2008:

It turns out that the book was right: total time for the
job was approximatly 1.5 hours, comprising of three parts:
Part 1:
1 hour - Post worried question to the list, read relevant
section on ‘‘XJS Help’’, drive to dealership, pay $15.00 for
tiny rubber bush, drive home, check J-L list, worry about
having the tools.
Part 2:
0.25 hours - Replace the bushing
Part 3:
0.25 hours - Loosen, clean, grease and reset both linkages,
start car, confirm 1000rpm cold idle, let it warm up,
confirm 650rpm warm idle, turn off car, make entry into log,
file receipt.

All in all, I would have to commend Kirby on the
completeness of his manual, but I must question why 5
alternate methods of varying complexity comprising 2 full
pages were devoted to this task…

Thanks to everyone for their help but special congratulations go to Ric, as his was the method chosen. :slight_smile:

Cheers,
Chris
1989 V12–
The original message included these comments:

Hi, my advice is if you are going to do it yourself follow the XJS
book, it really is good.
This was how I did my XJS V12, when the bushes went. I disconnected
the short link with a ball joint at each end that went from the
bellcrank to the spindle.
If I remember right there is a small circlip that holds the
lose. If you remove it, and remove the little clip off the other
end that actuates the throttle itself, you should be able to either
remove or move the spindle to get the old bush out and the new one
in.
After this though, you might have to reset all the linkages, as


Chris Los 1992 V12 Vanden Plas #51
–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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Great! For reference, here’s what a local V12 owner said…

"The quick fix for this is to buy a rubber grommet from the hardware store
with the correct ID for the shaft and slot diameter to fit the bracket. A
little grease on the shaft will keep things working smoothly. This problem and
solution are addressed in Kirby Palm’s book.

Some linkage disassembly is required but it is all done from up top and
shouldn’t take more than 30 minutes. NEVER adjust the stop screws at the
throttle butterflies, the idle is set at the thermostatic air bypass on the
left side of the engine. The throttles are fully closed at idle. To
synchronize the throttles, adjust them so that they start rotating the
throttle shafts at the same instant, when turning the center drum that the
throttle cable attaches to. This will give the best driveability."–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

thetopdogg wrote:

In reply to a message from Rich W sent Tue 5 Feb 2008:

It turns out that the book was right: total time for the
job was approximatly 1.5 hours, comprising of three parts:
Part 1:
1 hour - Post worried question to the list, read relevant
section on ‘‘XJS Help’’, drive to dealership, pay $15.00 for
tiny rubber bush, drive home, check J-L list, worry about
having the tools.
Part 2:
0.25 hours - Replace the bushing
Part 3:
0.25 hours - Loosen, clean, grease and reset both linkages,
start car, confirm 1000rpm cold idle, let it warm up,
confirm 650rpm warm idle, turn off car, make entry into log,
file receipt.

All in all, I would have to commend Kirby on the
completeness of his manual, but I must question why 5
alternate methods of varying complexity comprising 2 full
pages were devoted to this task…

Thanks to everyone for their help but special congratulations go to Ric, as his was the method chosen. :slight_smile:

Cheers,
Chris
1989 V12

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1 Like

Chris,

Been there, done that. 

My wife's V12 equipped 1990 XJ-S convertible had one throttle

linkage bushing missing and the other one was cracked when I purchased
the car. I reviewed Kirby’s book and other suggestions on how to
improve on the design, but decided to replace with the original
specification bushings.

I did this task along with a lot of other engine work

(compression check, new plugs, new rotor, new wires, new cap, new fuel
hoses, fuel injectors cleaned, etc) so I don’t recall it being a
particularly difficult or time consuming task. Nor do I recall needing
any special tools.

As I remember, I disconnected the linkage clips, the throttle

lever set screw and the mounting bracket at the rear of the manifolds
and maneuvered the shaft clear enough so that I could remove and replace
the bushings. You may have to disconnect the AAV hose on the left side
as well, but I think I did that at the same time.

I highly recommend getting a digital camera and taking lots of

before, in between and after photos of projects like this to make sure
you get everything back together again. Also put clean towel underneath
the entire area to make sure you don’t lose and critical parts.

Regards,

Paul M. Novak

1990 XJ-S Classic Collection convertible
1984 XJ6 Vanden Plas
1969 E-Type Fixed Head Coupe
1957 MK VIII Saloon
1985 XJ6 Vanden Plas (parts)
Ramona, CA
@Paul_M_Novak1-----Original Message-----
From: owner-xj@jag-lovers.org [mailto:owner-xj@jag-lovers.org] On Behalf
Of thetopdogg
Sent: Tuesday, February 05, 2008 12:21 PM
To: xj@jag-lovers.org
Subject: Re: [xj] V12 throttle linkage bushing replacement

In reply to a message from thetopdogg sent Tue 5 Feb 2008:

To clarify:
I am referring to part # C34388, which is a black double-
lipped nylon bushing which fits into part # EBC3624
(’'Throttle linkage bracket-LH( which is of course bolted to
the back of the inlet manifold.

It looks like I should be able to slide the bushing on the
linkage shaft from the back and then squeeze the front lip
of the bushing through the opening in the throttle linkage
bracket.

However, Kirby Palm lists several different methods, all
involving removing lots of tiny pieces.

-Chris
1989 V12 VDP

The original message included these comments:

The nylon bushing on the LH side throttle linkage is broken,
causeing the car to nearly stall when I first press on the


Chris Los 1992 V12 Vanden Plas #51

===================================================
The archives and FAQ will answer many queries on the XJ series…
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In reply to a message from Paul M. Novak sent Wed 6 Feb 2008:

I had that on my 1988 Daimler Double Six - it idled erratically and
when revving the engine one bank (the affected one) seemed to pick
up later than the other. I fixed mine in 10min, and it cost nothing
(other than 10min of time).

What I describe is not recommended as it’s an unashamed bodge.
However, it’s lasted very well, from Nov 2006 to date.

I used a piece of shiny cardboard (litter off the road) and rolled
it into a bush, with the shiny surface on the bearing side. I just
tore off bits if it was too large, and then had a nice light press-
fit into the bearing bush housing (which is just a hole in a bent
plate).

See:
http://www.jag-lovers.org/snaps/snap_view.php3?id=1156155118

I had to go back to my first pic album on my postings - god it was
a nalstalgic trip to look at what I’ve been up to!–
teddykan
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In reply to a message from teddykan sent Wed 6 Feb 2008:

Chris
Did you manage to fix the rear seat belt anchor section of your
car? I’ve completed mine, plus loads more other repairs, which you
can glean off my photoalbum.
Regards–
teddykan
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In reply to a message from teddykan sent Wed 6 Feb 2008:

Teddy;

I am very impressed by your innovative solution to the
bushing problem!
To address the rear seat belt anchor section rust, I too
employed an innovative solution.

I bought another car (Grey 1989 V12) that had been sitting
in a barn for 15 years after its owner was unable to drive
for health reasons. As a result, the interior was flawless
(except for headliner), the body was rust free, the
pepperpots unmarked and the odometer unscathed at 63,800km.
Of course the car leaked from every gasket and belched black
smoke for the first 5 minutes of running…

The rusty '87 sits in the garage and is raided occasionally
for mechanical parts. It also lets me do a practice run so
I can avoid doing damage on the '89.

True, the '87 is red on magnolia, and the '89 is grey on
grey, but in this part of the world everyone and their dog
has a 100 pointblack cherry/BRG/Cranberry V12 VDP.
I want to prove grey can be a contender too!

:slight_smile:

-Chris–
The original message included these comments:

Chris
Did you manage to fix the rear seat belt anchor section of your
car? I’ve completed mine, plus loads more other repairs, which you
can glean off my photoalbum.


Chris Los 1992 V12 Vanden Plas #51
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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Very funny…so this car will be in Victoria at “Jaguars on the Island”,
July 5?

Gregory,
Victoria, Canada
1966 Mark 2 3.8
1992 Series III V12 Vanden Plas (#92 of the last 100): Black Cherry!
2002 X-Type
2004 XJ8 4.2-----Original Message-----

in this part of the world everyone and their dog
has a 100 point Black Cherry/BRG/Cranberry V12 VDP.
I want to prove grey can be a contender too!

:slight_smile:

-Chris

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