[v12-engine] Throttle Linkage Bushings


(twerth) #1

I ran across a quick easy fix for this ‘‘common problem’’ the other
day and thought I’d pass it along. See page 269 of Kirby Palm’s XJ-
S book for more background on the issue. I found an assortment of
replacement door hinge pin bushings at O’reilly’s, and as it turns
out, one of the pairs of bushings is a perfect fit. These are brass
and should last the lifetime of the car. Cost is less than $3. Hope
this helps someone out.–
1989 XJ-S V12
Parkville/MO, United States
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(Kirbert - author of the Book, former owner of an '83 XJ-S H.E.) #2

twerth wrote:

I ran across a quick easy fix for this ‘‘common problem’’ the other
day and thought I’d pass it along. See page 269 of Kirby Palm’s XJ- S
book for more background on the issue. I found an assortment of
replacement door hinge pin bushings at O’reilly’s, and as it turns
out, one of the pairs of bushings is a perfect fit. These are brass
and should last the lifetime of the car. Cost is less than $3. Hope
this helps someone out.

Excellent! Two questions:

  1. Part number please – or at least what door hinges the kit is
    supposed to fit.

  2. How did you install them? Did you disassemble the linkage and
    install them with the flange on the inside so they are trapped and
    can’t come out? Or did you install them the easy way, just poked
    them in from the rear? And, if the latter, how do you keep them from
    falling out?

– Kirbert

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(dogdog) #3

In reply to a message from Kirbert sent Mon 13 Dec 2010:

The brass tubing you can commonly find in model shops is also an
easy fix. These are sized so that they fit inside eachother snugly,
but still rotate. Just buy two sizes and flesh it out with some
washers.

I’ll post a picture for you later.

kind regards
Marek–
MarekH
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(twerth) #4

In reply to a message from Kirbert sent Mon 13 Dec 2010:

No part number or specific model. This was just an assortment with
four or five different sizes on a card. It was in the aisle with
all the ‘‘Help’’ items (i.e. door handles, brake adjusters, vacuum
tees, etc.).

I’m in the middle of changing cam cover gaskets, so I have
everything disassembled. For me it was easy to install them from
the inside out so they’re trapped. I also installed a couple of
washers with each one so there is no slop (front to back) on the
linkage. It works really well and looks professional. I think this
is how it should have been done in the first place.–
The original message included these comments:

  1. Part number please – or at least what door hinges the kit is
    supposed to fit.
  2. How did you install them? Did you disassemble the linkage and
    install them with the flange on the inside so they are trapped and
    can’t come out? Or did you install them the easy way, just poked
    them in from the rear? And, if the latter, how do you keep them from
    falling out?


1989 XJ-S V12
Parkville/MO, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !


(jrinam) #5

In reply to a message from twerth sent Mon 13 Dec 2010:

T&M hardware also has them, in the nuts and bolts section. no part
no. any ‘‘real’’ hardware store should have an assortment of
brass and nylon bushings. did it a couple years ago so dont evan
remember what it looked like, but I did work as purchased, perfect
fit.–
john rinaman '84 xjs 5 speed
zelienople,pa, United States
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(dogdog) #6

In reply to a message from MarekH sent Mon 13 Dec 2010:

http://www.jag-lovers.org/v.htm?1292271401--
The original message included these comments:

I’ll post a picture for you later.
kind regards
Marek


MarekH
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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(Vikram Ambrose) #7

I went to Oreilly’s today and bought the 8 piece door hinge kit. None of the bushing in it fit tight enough for my liking. I instead found this bushing online which I think will be a much better fit;
It is Bunting Part no. EF050806
Flanged Sleeve Bearing,
Inside Dia. (In.) 5/16,
Outside Dia. (In.) 1/2,
Length (In.) 3/8,
Flange Dia. (In.) 11/16,
Flange Thickness (In.) 1/16,
50,000 Max. Pv,
Temp. Range (F) 10 to 220,
SAE 30 Oil Lubrication,
Powdered Metal Bronze (SAE 841),
Package Quantity 3

s-l500


(Robert Laughton) #8

I bought these

Rob


(JimD in Alabama) #9

yeah, I used the rubber OEM type from SNG Barratt. Heated up a bit to make more pliable and easier to force into place.
Some good info in the archives about people developing ways to use brass or whatever and have a “keeper” clip.


(Paul M. Novak) #10

I purchased some aftermarket throttle linkage bushings years ago and even after heating them up with my heat gun I was unable to insert them into their openings in the plate. After trying several times I eventually gave up and purchased the OEM bushings from the local Jaguar dealership. The OEM bushings were easy to insert. Clearly the OEM ones were made of a different material. I don’t have the tools or skills to machine the brass ones as suggested by others, and decided that the OEM bushings were the way to go for me.

Paul


(Kirbert - author of the Book, former owner of an '83 XJ-S H.E.) #11

Rubber bushings will work, but I don’t recommend them. Rubber bushings are the traditional choice for throttle linkages dating from the days when a throttle linkage included a shaft that fit a bushing on the firewall at one end and a bushing on the engine at the other. The pedal was connected to a crank near the firewall end and a link to the carburetor was connected to a crank near the other end. With such a setup, the engine could bounce around on its rubber mounts without affecting the throttle position.

The XJ-S does NOT have such a throttle linkage; it uses a cable to connect the pedal on the firewall to the engine. The throttle linkage bushings in question are for a shaft that is securely mounted to the engine at both ends, there is no relative movement and hence no need for them to be rubber. And, of course, as bushing material, rubber is – well, it’s not optimum. Hard plastic or nylon would be better. Sintered bronze would be better. Pretty much any rational material choice would be better. And better is more important than you might think, as having minimal “stiction” in a throttle linkage is a good thing when driving.

Why did Jaguar use a rubber bushing here? Because somebody involved wasn’t thinking. It’s a mistake, pure and simple.

And yeah, replacing the bushing without disassembling the bracket from the back of the intake manifold is difficult. If you can chuck up your new bushing in a drill or lathe, cut a groove around it, slip it in from behind and snap a clip onto it, great. If not, just go ahead and take the bracket off. Then it’s EASY to install the flanged bronze bushing in the photo above, just slip it in and bolt it back together.


(JimD in Alabama) #12

Yeah, Kirby that makes sense.

My bushings were absent so I had taken a quick approach.

Will get some of the better ones for replacement