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Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 10759
Experience:  40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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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: 10 months ago.
Category: Boat
Expert:  Tan replied 10 months ago.

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?

Customer: replied 10 months ago.
Crankcase oil is full and clean. Lower unit gear lube is kind of a bluest green.
Customer: replied 10 months ago.
Not sure if you recieved my answer. Crankcase oilis full and clean. Lower unit gear lube is kin of a bluest green.. Thx
Expert:  Tan replied 10 months 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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