What are those other three holes in the boat's transom?
The second one from left to right is the only one I'm currently plugging. Is it alright not to close the other three?
The boat hull is MAKO 86 23 feet . The boat is not currently sinking, but every 10 minutes I can hear the bilge pump pumping water (Like a jar of water) outside the boat. This is all new to me. I only know is that the second hole must be plugged before going to the water, but what are the other three for?
It is an outboard , center console and it also has a living well. I never use the living well. It always empty. The one I plugged each time I go into the water is the bilge drain. If not plugged the boat would sink. The other three I believe are called thru hull fittings. The other three I don’t understand the usage of them, I'm also suspecting that water is coming through them into the boat causing the bilge pump work every few minutes
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A 23 foot hull might be capable of using an inboard motor, in which case two of the holes could be for cooling water.
Boats are usually designed to be maintained. You should be able to get to the inside face of the transom fairly easily.
This post was sourced from https://outdoors.stackexchange.com/a/21152. It is licensed under CC BY-SA 4.0.
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Based on the information available in your current question. There should be hoses attached to the three 'holes' you don't regularly plug. Inspect all the hoses from all the 'holes', repair or replace as needed.
One of the 'holes' should be where the bilge pump ejects water.
The other two 'holes' could/should be for water intake and output for the live well (fresh water to keep fish alive when you catch them)
You should be able to identify the bilge ejection port, while the boat is on the trailer, use a garden hose to put some water in the bottom of the boat and turn on the bilge pump. Never plug this hole, you will burn out your bilge pump.
Assuming the other two, are for the live well, and that you are not able to track them visually to confirm. You probably need to take your boat to a boat mechanic to problem solve and address.
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