Water dome seals.

[Matthew]

I have taken my scott water dome apart and found old copper crush washers fitted with tons of sealer.
Scottparts sell a viton o-ring for the spark plug ferrules, do i need to use any sealant along with the o-ring or not?
The aluminium water dome seems corroded since the previous owner seemed to of used straight water for coolant.
Thanks.
(1929 scott flying squirrel 500cc)

[Glyn Chambers]

The corrosion is caused by different metals in near contact with each other Galvanic Action it is called, about the worst combination you can get is steel copper & aluminium. = area around the sparking plug ferrules.
see Technicalities 2.4.30 or Yowl Vol 9/12 (July 1976)
“Potty”

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