Has anyone else experienced outboard motor bracket failure/snapping?

Looking at the pic, the clamps were screwed up to the full extent. They weren't over tightened per chance?

I don't think so. What is left still screws up and down so the pic does not show the setting when they snapped. In any case, I would have thought that the transom would have gone first or at least shown signs of stress but it's pristine.
 
As a design engineer I would suggest they should be designed to take the load seen by tightening the screws as much as is possible. My guess is the material is too brittle, wrong type or heat treatment.
 
As a design engineer I would suggest they should be designed to take the load seen by tightening the screws as much as is possible. My guess is the material is too brittle, wrong type or heat treatment.

In case of interest, here is the other side of the breakimage4.jpg
 
Do you have a university near you? If so have a talk with the mechanical engineering department, they may be able to help.

Good idea. I am in Plymouth and will make contact if they have a department. Meanwhile, anyone's ideas on how to name and shame Nissan America (suppliers of the engine) into accepting their warranty responsibilities would be gratefully appreciated. I am wondering if there is a marine consumer body/association or such like?
 
Meanwhile, anyone's ideas on how to name and shame Nissan America (suppliers of the engine) into accepting their warranty responsibilities would be gratefully appreciated. I am wondering if there is a marine consumer body/association or such like?
Depending on age/usage your claim may well be against the supplier/retailer. Initially direct to them, then via small claims court (not fit for purpose etc).
 
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