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After R&R my leaking timing cover and looking at the bypass fitting that is screwed into it and thinking may need to replace it, I remembered this and thought I should share this with you all.
Ever wondered why the bypass fitting on your expensive engine are only zinc plated metal?.
And not a nice, anti corrosive metal like brass!.
Answer is, it is there to act as a knoble metal.
"A sacrificial anode if ya like".
It is cheaper and easier to replace it, than that expensive manifold or cover it's screwed into.
Yes they are a pain if they corrode.
It is intentionally engineered that way, to give up first.
Say $20 fitting ver $400 die-cast piece.
Faulty fitting $20+ flush+coolant+new hose = cheap, compared to.
Corrosion eaten cover say $400+ R&R+ flush+coolant+new hose = expensive
cheers
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