Use proper coolant, the green stuff. It has the inhibitors/additives
already mixed in together with the antifreeze. Using tap water in a mix
will cause some deposits that may react.
You do have to replace the coolant periodically, say every three years.
When doing so always rinse your engine with clean water, tap water will
do!!, add a can of radiator cleaner, mostly caustic soda, let the engine
run for a while, drain, rinse thoroughly, drain and refill with coolant.
Whatever you have used in the past, you will be amazed about the amount
of sediment that will come out. Probably most of it are old deposits
that have dissolved/come loose, even if you have had your engine
rebuilt. It is nigh impossible to clean out all deposits during a rebuild.
When you start of with a brand new engine, replacing the coolant without
flushing the engine usually suffices. Ever saw a modern, well maintained
car with deposits? I sure never did.
Kees Oudesluijs
NL
Op 12-6-2013 11:20, Thomas Willig schreef:
> My advice-learned the hard way : Do not use distilled/demineralised water in
> your cooling system. This stuff is very aggressive and together with cast
> iron creates the ideal climate for corrosion. I just had to flush my BN2
> engine after running it for one year after a complete rebuild. I used a
> mixture of antifreeze and demin water. You will not believe the amount of rust
> that came out of this engine after such a short time. I will now use tap
> water and normal antifreeze. That worked well in the "old" days and
> everything else seems to me as "over-engineering".
>
>
> Cheers
>
>
> Thomas Willig
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