[xj40] question about damaged cruise control bellows

Noticed some time back the c.c. ceased its function. And
just noticed accidently the badly split open vacuum bellows.
Suppose new one is the only way out but any suggestions
welcome and where to find new one. Suspect most in breaker
yards are aged and cracked. Are the rebuild-able? Thanks.–
LarryWard '93XJ40 '81MBZ300TD '95 Dodge4x4 CTD
modesto, ca., United States
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In reply to a message from LaJagy sent Wed 10 Jul 2013:

Larry,

I suppose it depends on how much you value your cruise
control facility. The bellows, DBC2641, are still available
mail order from JDHT (and therefore your local dealer) for
the princely sum of �43.46 GBP (about $65 USD) plus shipping.

I would risk a breaker’s yard find for that price! :-)–
The original message included these comments:

Noticed some time back the c.c. ceased its function. And
just noticed accidently the badly split open vacuum bellows.
Suppose new one is the only way out but any suggestions
welcome and where to find new one. Suspect most in breaker
yards are aged and cracked. Are the rebuild-able? Thanks.


Bryan N, now Jag-less, but fun while it lasted.
Cambridgeshire, United Kingdom
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In reply to a message from sophistic@btopenworld.com sent Thu 11 Jul 2013:

Bryan, Its true, I have no serious need of cc but it did
work nicely on some trips which are not so frequent now. I
am seriously weighing in on selling machine after having
right side hvac fan losing 4 blades and is noisey on all
speeds except low due to imbalance. But it is other than
paint clearcoat failing a very smooth comfortable ride. Its
first few years in Florida but most time and miles in
California so it has never suffered rust attacks. I too may
be Jag-less. We will see. Thanks Larry–
The original message included these comments:

I suppose it depends on how much you value your cruise
control facility. The bellows, DBC2641, are still available
mail order from JDHT (and therefore your local dealer) for
the princely sum of �43.46 GBP (about $65 USD) plus shipping.
I would risk a breaker’s yard find for that price! :slight_smile:


LarryWard '93XJ40 '81MBZ300TD '95 Dodge4x4 CTD
modesto, ca., United States
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In reply to a message from LaJagy sent Thu 11 Jul 2013:

Larry…

Sad to hear that you’re considering going Jag-less, hope you change
your mind.

I’m afraid as time marches on we’ll be hearing more and verses
of (and I loosely translate) the somg…’‘Those clock hands are
breaking up that old ‘Jaguar’ gang of mine’’!–
Groove, 1989 XJ6 3.6L
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In reply to a message from LaJagy sent Wed 10 Jul 2013:

Hi Larry,

I’m a big fan of cruise control on the highway, so I feel
your pain.

Something I’ve always wondered is this: is the bellows the
actual functional diaphragm of the actuator, or is it just a
dust cover for the inner workings of the vacuum-operated
solenoid? If the bellows is just a dust cover, your problem
may actually lie elsewhere, such as in the purge valve
(mounted on the leading edge of the left fender well below
the air filter intake snorkel and a common failure point).

You might try applying vacuum to the actuator to see if it
still works. If it doesn’t, I’d be tempted to try sewing
the split in the bellows with thread as a reinforcement,
then sealing it with a good flexible silicone sealant or
inner-tube repair cement.

Let us know if you get a chance to test the actuator with
vacuum.

Don–
The original message included these comments:

Noticed some time back the c.c. ceased its function. And
just noticed accidently the badly split open vacuum bellows.
Suppose new one is the only way out but any suggestions
welcome and where to find new one. Suspect most in breaker
yards are aged and cracked. Are the rebuild-able? Thanks.


Don B : '93 VDP Flamenco Red 191K : (ex-'88 Sovereign)
Franklin, TN, United States
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In reply to a message from Don B sent Thu 11 Jul 2013:

Don, That dust cover does make some sense. Will pursue your
kindly thought and do vacuum test. Thanks. Larry–
LarryWard '93XJ40 '81MBZ300TD '95 Dodge4x4 CTD
modesto, ca., United States
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In reply to a message from LaJagy sent Fri 12 Jul 2013:

No its not a dust cover, its fully functional bellows which runs
off the vacuum system

And I don’t think they are repairable - it would depend on where
the split/hole was but if its on the body (rather than the edge) of
the bellows then don’t think it can be recovered

If you are disconnecting/not using and/or its split then suggest
blocking off the vacuum line

Nigel–
1987 XJ40 3.6 Auto Sov SAJJHALH3AA512874
Singapore, Singapore
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In reply to a message from LaJagy sent Wed 10 Jul 2013:

Larry…

I see where new bellows run anywhere from $80 to 100…Yikes!!

Just a thought, If you can access the tear then remember this is
vacuum actuated. In other word instead of air pressure trying to
blow your patch off the vacuum will be trying to suck it together
and help you seal it.

I would imagine a big old ugly patch would probably work. So what
do you really have to lose even if you end up trying to pry the
thing apart.–
Groove, 1989 XJ6 3.6L
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Like Larry W some 6 years ago my cruise control was recently discovered to be non-op. A quick inspection revealed the culprit, a massive split in the rubber diaphragm of the actuator, although it wasn’t immediately evident as it was on the underside and not readily seen from above:


My first thought was a repair of some type, which I may still attempt as a learning experience, but given the major distortion of the diaphragm / bellows I’m not hopeful a repair will.be successful.

I sourced a new part and my c.c. is again operational. If I do attempt a repair I will update this post.

Depending on degree of puncture/split how about bicycle tube patch(es)

Since you are in Modesto California, you’re not far from Jaguar Heaven in Stockton California. The massive Jaguar graveyard on the ground. I would take a look at their prices and the condition of the ones they have off their very large number of cars. Question to forum: are these a common failure item even at 28 plus years? Just looked at mine and it seems quite soft and pliable even at 29 years.