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7.4 mercruiser winterizing

GAS engine, transmission and generator repair and maintenance discussion forum.
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Topic author United States of America
crquisto
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Posts: 46
Joined: September 17th, 2014, 12:50 pm
Vessel Info: 2000 Carver 406 Aft Cabin, twin 7.4 gas Mercruisers - Flyboy II
Location: Possum Town, TN
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7.4 mercruiser winterizing

Postby crquisto » November 9th, 2015, 10:23 pm

Does anyone know how many gallons of antifreeze it takes to winterize each engine's seawater side from the thru-hull to the exhaust on my 2000 405 with 7.4 Mercruisers?

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feeez
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Vessel Info: 2001 350 Mariner
Location: Beacon Bay Penetanguishine Ontario
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Re: 7.4 mercruiser winterizing

Postby feeez » November 9th, 2015, 11:06 pm

crquisto wrote:Does anyone know how many gallons of antifreeze it takes to winterize each engine's seawater side from the thru-hull to the exhaust on my 2000 405 with 7.4 Mercruisers?


If I understand this correctly you keep feeding it until the antifreeze comes out the exhaust. My 350 MPI's take around 4 gallons before the pink comes out. It will be more if one of your engines routes water to your water heater while underway.
Former 2001 350 Mariner owner
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Lyndon670
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Vessel Info: 2000 Carver 506
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Re: 7.4 mercruiser winterizing

Postby Lyndon670 » November 10th, 2015, 6:26 pm

Yep, once the pink is pumping out of your exhaust - mission accomplished.
Lyndon,
2000 Carver 506
FOXY JOE
Volvo 7.4TAMD
Queens Cove Marina
Georgian Bay, Ontario
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Topic author United States of America
crquisto
Scurvy Dog
Scurvy Dog
Posts: 46
Joined: September 17th, 2014, 12:50 pm
Vessel Info: 2000 Carver 406 Aft Cabin, twin 7.4 gas Mercruisers - Flyboy II
Location: Possum Town, TN
Has thanked: 2 times
Been thanked: 1 time

Re: 7.4 mercruiser winterizing

Postby crquisto » April 25th, 2016, 2:55 pm

My 2000 406 book says to fill a 5 gallon bucket with antifreeze and run it all through. Si cs you can't see the exhaust color with the boat in the water, that's what I do and have had no problems

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