Hi .. Looking for anybody who can help with suggestions on this issue.
Back story -- I picked up a submerged mooring
line or similar leaving the marine
. It wrapped and bent the shaft.
Local Marine engineer
had the shaft replaced. Also fitted new bearings (rubber type)
During the process..he smashed the bronze
cast housing at the engine
end of the stern tube. It housed a white metal bearing. When it was replace/remade, the decision was made to fit a rubber bearing in place of the white metal bearing.
The whole system was reassembled and went back into the water
The problem surfaced about 4 weeks later when I went to back out of the marina. The shaft made a horrific noise
. I call the engineer
who listen and then removed the boat
back out of the water
. He thought something had come loose.
..it was discovered that a film of calcification had formed on the shaft inside the bearing areas.
It was clean off .. polished and put back together.
I wasn't there but apparently it was back to being silent. (no noise)
My next visit to my yacht (about 7weeks later) I was alarmed to hear the same ..and possibly worse noise
from the shaft. The Engineer says ..not his issue!
The yacht had been in the same berth with me as owner for 4 years and for the previous owner ... for 10 years. Never had calcification issues before (with the old shaft)
Has anybody had experience with this. ?? I'm wondering if its an electrical
issue now that the shaft is isolated with the rubber bearing replacing the the white metal one.
is currently unusable as the calcification is ripping the cutlass bearing to shreds.
Attached photos of the system assembled and disassembled showing calcification.