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Old 08-10-2020, 08:34 PM   #1
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Default Impeller Replacement Mercruiser 7.4

Does anyone know if you need to do a haul out to pull the pump out on a 3300 SCR? I have heard you can plug the hose after you pull it off the pump but am wondering if the volume will be too strong.
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Old 08-10-2020, 09:29 PM   #2
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Welcome aboard!

Iím assuming you are referring to the raw water engine pump; correct? If so you can pull the hose and plug it as well as lift it some. The amount of water will not be a concern of flooding the boat. Some water may come out the exit hose as well as there is standing water in the engine.
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Old 08-10-2020, 09:32 PM   #3
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Don't know your boat but I assume it has a ball valve you can shut off. Follow the hose back to the bottom, should be there. Do NOT pull the hose without sitting off the ball valve.
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Old 08-10-2020, 10:05 PM   #4
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I've replaced my impeller in the water a few times... You get a little water but not much. Just shove a rang in them and wedge them up behind something pointing up.
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Old 08-11-2020, 12:07 AM   #5
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Quote:
Originally Posted by Dhalter View Post
Don't know your boat but I assume it has a ball valve you can shut off. Follow the hose back to the bottom, should be there. Do NOT pull the hose without sitting off the ball valve.
No ball valves to shut off with I/O applications.
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Old 08-11-2020, 12:11 PM   #6
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No issues doing it in water. There may be some flow as previous posters indicate, but it’s not like a fire hose. Pumps should easily handle the little bit that may run into the bilge
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Old 08-13-2020, 08:15 PM   #7
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Thank you all for the input. Dan
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