I had an auto shop teacher many years ago who advocated removing the drain
plugs from the block and using high pressure compressed air blown into the
water jacket to help dislodge and drain the debris.
I used this on a 55 Chevrolet with great success.
Steve
----- Original Message -----
From: "Navarrette, Vance" <vance.navarrette@intel.com>
To: <me@jasonwgeorge.ca>; <6pack@autox.team.net>
Sent: Monday, August 30, 2004 9:43 AM
Subject: TR6 or TVR overheating woes
> Jason:
>
> Sounds like your cooling system is full of scale and/or rust.
> The drain plug should allow coolant to drain freely from the block. If
> you
> removed it and nothing happened, your block is full of sediment of some
> sort.
> It does not mean anything is wrong, but your engine is 30 years
> old,
> and if not scrupulously cared for, eventually the block will fill with
> sediment. This stuff can clog radiators, and close off smaller coolant
> passages.
> It is difficult to get out, short of popping the head off and
> using
> a welding rod to break it up. There may be something that comes in a
> bottle
> you can add to the cooling system to dissolve or break it up, but I have
> never
> heard of such a thing. Perhaps someone else on the list has had success
> with
> some product? I know phosphoric acid (a.k.a. Naval Jelly) will dissolve
> rust.
> Maybe there is some product based on that?
> Anyway, to drain the block, you will need to jam a piece of
> welding rod or
> some other stiff wire in there to break up the scale and let the coolant
> out.
> Keep us posted.
>
> Vance
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