Hi, I'm waiting on parts for my outboard so I got to wondering...
I noticed that the mounting bolts for the lower trim and tilt pin on my Yamaha F60T do not appear to be stainless steel. A mechanic who has been helping me out told me that they are in fact galavanised steel so as to be more corrosion resistant and to prevent a reaction with the stainless steel pin and so cause galling or a fusing of the bolt in the pin.
I always thought it was the reaction between different metals that caused seizing. Or is the Zinc of the galvanised layer immune to this?
From what I gather online, stainless steel is almost always stronger and more corrosion resistant. Just wondering why Yamaha would used a galvanised bolt for this location that is often submerged and for which some strength is required. Thinking back, there are a number of galvanised bolts in the outboard. Just wondering why Yamaha would spec these instead of a presumably longer lasting stainless steel one. Is it just about cost?
Having said that, both bolts on the pin came out without too much difficulty despite not having been touched since they left the factory almost 13 years ago! There was some corrosion on the bolt head itself, but the bolts themselves were pretty ok. I'm replacing the bolts because they're not expensive and to ensure that they can still come out easily after another 13 years.
I noticed that the mounting bolts for the lower trim and tilt pin on my Yamaha F60T do not appear to be stainless steel. A mechanic who has been helping me out told me that they are in fact galavanised steel so as to be more corrosion resistant and to prevent a reaction with the stainless steel pin and so cause galling or a fusing of the bolt in the pin.
I always thought it was the reaction between different metals that caused seizing. Or is the Zinc of the galvanised layer immune to this?
From what I gather online, stainless steel is almost always stronger and more corrosion resistant. Just wondering why Yamaha would used a galvanised bolt for this location that is often submerged and for which some strength is required. Thinking back, there are a number of galvanised bolts in the outboard. Just wondering why Yamaha would spec these instead of a presumably longer lasting stainless steel one. Is it just about cost?
Having said that, both bolts on the pin came out without too much difficulty despite not having been touched since they left the factory almost 13 years ago! There was some corrosion on the bolt head itself, but the bolts themselves were pretty ok. I'm replacing the bolts because they're not expensive and to ensure that they can still come out easily after another 13 years.
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