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Mercury lower unit a/c plate crack

Old 11-26-2020, 10:00 AM
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Default Mercury lower unit a/c plate crack

I bought this boat over the summer. The 2016/17 mercury 150 has a crack on the anti cavitation plate that was disclosed by prior owner. He hit a log a couple years ago. I have run the boat and the engine runs fine with the crack but it does kick up excess spray around the engine. I have 3 options I think

1) Do nothing since it runs fine. The boat is either on a lift or a trailer and is run in brackish water. I bought engine with 33 hours and changed lower unit gear case lube at about 50 hours. The engine now has 58 hours.
2) Put JB weld in crack to help prevent corrosion?
3) mercury mechanic quoted me 800-1000 to fix it so it’s like new. He has a guy that can heat it up and weld then paint. I’d get my lower unit serviced (New water pump/thermostat) while LU is off engine. The original owner didn’t service engine so this will be first replacement but it was a freshwater boat.

Any thoughts on what option is best or is there another option?





Old 11-26-2020, 10:23 AM
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Have it welded
I think a welder could do it much cheaper

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