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Why does a lower unit get cracked

S

spdrcr03

Member
"My prop has about a half inch

"My prop has about a half inch chunk missing from one of the three blades. I never noticed a vibration or any loss of performance. I am wondering if this could have caused my lower unit to crack? I don't recall ever hitting anything....do props with gouges pose any danger to other parts I guess is what I am looking for here, also does anybody know where I can get a lower unit for a 1974 Mercury 650 ser# 381666 for a decent price?

Thanks..................Greg"
 
"Also, if anybody can offer an

"Also, if anybody can offer any advice as far as compatibility of other years and hp of different Mercury lower units, for example, right now I am looking at a lower unit from a Mercury 500 50hp, it looks the same and measures the same. Am I on the wrong track here??"
 
Usually has to do with water i

Usually has to do with water in the lower unit freezing (neglecting to maintain seals).Those lower units are not "heavy duty" i am told.The 4 cylinder units were better.If it looks the same use it.
 
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