Re: FW: [xj-s] Plugged Rads

["Kirbert" <palmk@mailer.gadcomm.net>]

> From:          scott.horner@telecom.co.nz (Scott Horner)
> >Has Jaguar ever justified their barrs leaks recomendation??
> 
> I believe that it's a last ditch attempt to seal the liners.  When I had my last
> engine rebuild, I was informed that they had put Bars leaks in the engine
> and that looking at my previous engine, which had only been in the car 12
> months, that there were signs of leakage on a couple of the liners.

The guy at the radiator shop says that Barr's Leaks is generally 
recommended by manufacturers to seal head gaskets.  He confirmed it 
is a disaster for radiators, and recommends not using it.

I'd like to know where Scott's liners were leaking: at the head 
gasket, or at the lip where they sit on the block?

Regardless, you won't find me putting any of that crap in my coolant. 
 If I have head gasket leaks, I'll deal with it.  As far as I know, 
the V12 has little or no trouble with head gaskets (as opposed to the 
XK 6-cyl) so maybe this recommendation was force of habit from 
Jaguar.

Here's my suggestion:  I'd be willing to bet that if the mechanics 
assembling the engines would use anti-seize compound on the head 
studs, there wouldn't be any problems with head gaskets!  With the 
anti-seize compound, less of the torque applied to the nuts goes to 
overcoming thread friction and more of the torque goes to tensioning 
the studs, so there's more and more even compression on the head 
gasket.  I have a grand total of one half of one engine's experience 
here (the A bank of my car), but there was NO indication of coolant 
leakage past the head gasket and no Barr's Leaks was ever used.

 -- Kirbert      |     If anything is to be accomplished,
                 |     some rules must be broken.
                 |          - Palm's Postulate

---

References:

• FW: [xj-s] Plugged Rads
• From: scott.horner@telecom.co.nz (Scott Horner)

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