- Jul 10, 2020
- 161
- Boat Info
- 1981 310 Vanguard Express
- Engines
- Twin Mercruiser 6.2 MPI Horizon FWC inboards
Hoping the brain trust here can help. The rest of the internet can't. What am I looking at here? It's kinda hard, almost rocky. It looks like calcium (and it fizzes a little in vinegar so I think it is) but... how? Seawater leaking past the block-off gasket and creeping into the manifold leaving deposits behind?
Backstory is I pulled a riser in the course of chasing a coolant leak and investigating some light rusting around the riser/manifold gasket. It's a little up inside the riser too, but not really. Makes me think it was coming in through the gasket.
I pulled plugs, cylinders are dry. Risers and manifolds were "just done" before I bought the boat in 2020, so in theory they are 4 years old. Sadly I think the flat surface on the manifold is too pitted to recover so I plan to change the whole thing.
Backstory is I pulled a riser in the course of chasing a coolant leak and investigating some light rusting around the riser/manifold gasket. It's a little up inside the riser too, but not really. Makes me think it was coming in through the gasket.
I pulled plugs, cylinders are dry. Risers and manifolds were "just done" before I bought the boat in 2020, so in theory they are 4 years old. Sadly I think the flat surface on the manifold is too pitted to recover so I plan to change the whole thing.