> Firstly. It has been running for the last couple of weeks
> just on water.
> No point wasting anti-freeze and making a sticky mess if it
> leaks like a
> sieve. So far my only obvious leak is at the top of the radiator (see
> question 2). What is the recommendation for a modern
> anti-freeze type to use in it?
Plain old Prestone works well. I'd suggest 30/70 unless you need more
> Second. There is a small pressure leak in the weld at the
> very top corner
> of where the expansion neck is attached to the main body of
> what appears to
> be the original radiator. The running temperature on short
> drives (less
> than 10 miles) looks good, so I would prefer not to
> overhaul/re-core the
> radiator at this time. Any tips on what type of weld this is
> and whether
> they can be successfully rewelded/brazed?
I believe it was originally a solder joint. Certainly other places are
soldered; so applying heat to this joint will almost certainly open up a
leak somewhere else. JB Weld _might_ work, but personally, I would just
take it to my radiator guy. Simple repairs like that are usually only $30
or so; and he will only do the work I agree to. On occasion he has told me
it was too far gone for a reliable repair, but offered to try anyway ... no
charge if they didn't succeed.
For a TR4, unless originality is important, I'd be tempted to convert to the
later style radiator without that long neck. The neck seems to be a
perpetual problem point for me ... I may even do away with the one on my
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