Fixing alloy transom plate?

[Geoff_Jubb]

Hi everyone,
When fitting an alloy transom plate (the type you fasten your engine to), do you use strainless steel screws, or will these react with the alloy?
Cheers,
Geoff

[martini]

Theres not much choice other than to use stainless screws, the trick is to isolate the two using nylon/plastic washers etc. Applying some of this stuff to the contact surfaces also helps a lot.

[thornbackflound]

Originally Posted by Geoff_Jubb

Hi everyone,
When fitting an alloy transom plate (the type you fasten your engine to), do you use strainless steel screws, or will these react with the alloy?
Cheers,
Geoff

Psssibly with the SIKAFlEX as well ,may isolate the two? has to be done any way to stop salt water geting into the ply transom as you know,but got half a chance rather the useing a corrosive metal nut n bolt,a good wash down in fresh water may prolong the two reacting?just my thought tho Geoff,no expert

[doggypaddle]

You will have an aluminium plate, withe stainless through bolt, clamping an aluminium alloy engine bracket anyway, screws are probably the least problem! I used loads of sikaflex and stainless screws and its been fine sofar make sure the anode on the engine is OK

[9D280]

Put one of them on a dory with stainless 10-ish years ago, been outside ever since & no problems.

Form me memory the Ally is the more reactive of the two, and is also by far the bigger lump, so from memory the chemistry sorts itself out.

If you are really worried, I have seen nylon versions.