[xj-s] Re:

["Robert C. Warnicke" <Obstinate@worldnet.att.net>]

C Kyriakides wrote:
> 
> US, 1990 Jaguar XJS V12 Convertible, 5.3
> (snip)
God Bless all Jaguar Experts.  They are needed in this world!
found that the radiator is seriously clogged 
I would also love to see my cat running without a heartburn.
Does the engine get damaged by prolonged running at higher than normal
temperatures?
Is there any way I unclog the radiator without lightening my wallet by
$1,000?  I would apreciate any comments.
Also, I got this crazy idea of getting rid of the noisy, huge,  heavy
yellow mechanical fan and replacing it with an electric one. 
How difficult a job is it, bearing in mind that I am an Electrical/
Electronics Engineer?  Can anyone tell me?
Also, how about an oil cooler?

Thanks in advance,

Chris,
1990 Jaguar XJS V12 Convertible, 5.3
(snip)

First, read THE BOOK, not the archives.  In fact, I have repeatedly
tried to get infomation out the the archives only to be frustrated.  The
book is now accessable online from jag-lovers.com.  Read it.

Second, if you take your radiator out yourself, take it to a radiator
shop.  They will clean it for $100 or so.  I think the term is rod, they
will rod it out.  They will also flow and pressure check it.  I took
mine out friday.  It took two hours, but I played around a lot.  (I
didn't believe it was NOT bolted in at the bottom).  I think THE BOOK
talks about this too.  (by the way, I got a call from the shop saying
they wanted to leave it in the vat a while cause it was "still hurling
white chunks".... get desrcipiton huh!)

Third, Jags do not get heartburn from overheating, they do get dropped
exhaust valve seats.  That is way more money than you want to spend.  I
know THE BOOK talks about this.  It is a common problem that you do not
want to have.  You must keep your cooling system up to par.

Fourth, many have converted to electric fans.  They are available at
almost any autoparts store for about $100.  Some of us have opted to get
used ones.  The author of THE BOOK had luck finding them in GM
transversly mounted V6 cars.  I found that Fieros make great doner cars.
You need the biggest one you can find in a junkyard.  I think the
biggest standard GM is 16+ inches. I got two for $21.00 a piece.  The
jag shroud is cut for a 17 inch fan.  The author of THE BOOK is having a
new sheet metal shroud made for $20.  I am going to try and attach to
the original shroud, others have attached to the radiator or to the
shroud, but the shroud is bolted to the car better, the radiator sits on
rubber and is only bolted in at the top so it may vibrate more.  I also
want to be able to remove the radiator without fussing with removing the
shroud and then another fan.

As an aside, some of us are considering adding an electric water pump to
the jag to cool if after shutdown.  At this time there is a lot of heat
in the engigne that is not being transfered away.  Runing a fan or
popping the hood after shut down may help.  Imediately after shutdown
engine temperatures soar.  This is when valve seats apparently drop.

Fifth, the jag alredy has an oil cooler (in fact it likes to trick you
into thinking that the radiator is bolted in at the bottom by hanging on
to the radiator and not letting go when you try to remove it).  The oil
cooler is a bypass cooler only.  THE BOOK descirbes a couple of methods
for making it always work, which seems like a really good idea since it
doesn't cool now when your engine REALLY needs it.  I haven't tried this
modification yet.

Sixth, if you are an engineer you are way up on me.  You can certainly
remove a radiator yourself and hang an electric fan.  People on this
list will help guide your way.  This list has been VERY good to me. 

I am responding to your questions becuase they are commonly asked, and
because I thought it would take some the burden off the others.

As you can probably tell since I repeated it so much, THE BOOK is the
best thing you can read to understand what should be done to keep your
Jag on the road. 

73XJ12 (yeah, I don't have an S, but I have all the same problems)

---

References:

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• From: C Kyriakides <christky@erols.com>

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