rondds
Well-Known Member
- Oct 3, 2006
- 8,859
- Boat Info
- 2001 380DA
- Engines
- Merc 8.1s (2008)...Hurth ZF 63 V-drives...WB 7.0 BCGD (2013), Garmin 8208 & 740 MFDs, GMR 24xHD dome
I think the concept of Seacore pertains to "salt-proofing" that which hangs in the water all the time (the outdrive). There was a time when Merc coated the internals of the manifolds with some sort of ceramic stuff but that was another bad design that failed.
Merc designed the seawater side of the engine internals (in a closed cooling system) to drain when the engine shuts down. That's why there are no anodes in our cooling system components. Problem is that oxidation can only occur when there is oxygen present. If the system remained flooded with seawater all the time it couldn't oxidize. So yeah, we don't have zincs to change but in a saline environment, the manifolds and risers are inevitably going to rot away in 5-10 years. At least they moved to a stainless exhaust elbow.
Merc designed the seawater side of the engine internals (in a closed cooling system) to drain when the engine shuts down. That's why there are no anodes in our cooling system components. Problem is that oxidation can only occur when there is oxygen present. If the system remained flooded with seawater all the time it couldn't oxidize. So yeah, we don't have zincs to change but in a saline environment, the manifolds and risers are inevitably going to rot away in 5-10 years. At least they moved to a stainless exhaust elbow.