Stainless Steel and Cast Iron Galvanic Corrosion

[Mike57]

Hi all

I am working on some corrosion repairs on a 1929 Junior. i have sourced a replacement inlet and outlet cooling system pipes for the engine (thanks to some very generous donations from local club members) and need to work out what material I should use for the threaded rod that holds the lower inlet cooling pipe onto the block as the original is completely gone (I was lucky to get it all out). Fortunately there is enough thread left in the block to thread in a replacement along with some Loctite 660 or similar bonding compound.

My question is what material I should use for the threaded rod. I don't want any further corrosion in that area. I am thinking of stainless steel but the data that I have found does not give me a clear idea of whether cast iron and stainless steel are a good combination when immersed in an electrolyte and there are several choices in stainless.

Does any one have any experience or expertise in this area. If I am threading in a rod into the block and it lives in coolant what material choice would be appropriate.

Thanks for any replies.

Mike

[jeans_old_man]

Silver steel. Lovely to work with (unlike stainless) and fairly resistant to corrosion.
'A high carbon bright tool steel, centerless precision ground to very close tolerances', it is called Silver steel because of its bright finish but it does not contain any silver.
Should last another 90-odd years or so!
Regards
Brian

[Phillip]

I'd agree. Work well on the throttle spindle rod that goes across the manifold on rhe 972cc Sports engine also.