Rust stain coming from through hull bolt

finchturf

New Member
Jun 9, 2008
39
Westminster, MD
Boat Info
340 Sundancer 2006
Engines
Twin 8.1 Mercruiser Inboards
Looks like one of the bolts that mounts the hyd. cylinder to the trim tab has a compromised seal. They are stainless screws with nuts on the inside. One of them has a rusty washer, looks to be a little damp and has a rust stain running down from it. This obviously has been an issue for a little while anyway - but how big of an issue is this? I know it needs to be repaired - and without pictures its difficult to tell just how bad it is. What could happen? Could it ruin the transom?
 

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