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Have a gm5.3 marine inboard that runs fine on muffs out of…

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Have a gm5.3 marine...

Have a gm5.3 marine inboard that runs fine on muffs out of the water and prop seems to run good,but once in the water boat will not come up to speed

Mechanic's Assistant: Sometimes boat issues seem like they'll be really complicated, but end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.

Really little more to tell except 5.3l gm inboard runs fine on shore with muffs and prop runs but once in the water motor runs and prop turns but no speed

Mechanic's Assistant: Is there anything else the Marine Mechanic should be aware of?

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Submitted: 7 months ago.Category: Boat
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Answered in 5 minutes by:
12/28/2017
Marine Mechanic: Jason, Marine Mechanic replied 7 months ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 18,203
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
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H​ello my name is ***** ***** am I speaking with? Who makes this engine? Is it a Mercruiser, Volvo, OMC or something else? Do you have a model or serial number on the engine so I can identify exactly what it is that you have?

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