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What could have caused a mercury 60 hp outboard to seize up?

Customer Question
What could have caused a mercury 60 hp outboard to seize up?
Submitted: 2 years ago.Category: Boat
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Answered in 4 minutes by:
7/18/2016
Marine Mechanic: Tan, MerCruiser Certified Technician replied 2 years ago
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,426
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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Hello. My name is Tan.

Are you sure it is the engine and not the lower unit?

The only things that will cause an engine to seize as a manufacturer defect, failed beaingg water intrusion.

Is the crankcase full of oil and is it clean?

Check the gear lube in the lower unit what color is the lube?

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Customer reply replied 2 years ago
Crankcase oil is full and clean. Lower unit gear lube is kind of a bluest green.
Customer reply replied 2 years ago
Not sure if you recieved my answer. Crankcase oilis full and clean. Lower unit gear lube is kin of a bluest green.. Thx
Marine Mechanic: Tan, MerCruiser Certified Technician replied 2 years ago

Ok. The next step is going to be to remove the spark plugs and check for water in the cylinders. If no water then you have had an internal failure of the engine and it will have to be disassembled, inspected for damage.

Can you move the flywheel any?

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