To each their own. Been doing it this way since I've owned the boat and never have issues. Many others do it this exact same way.
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This is for all the dumb dumbs out there who think they can just suck up 5 gal of antifreeze in their raw water cooled indmars and get all excited when they see pink coming out the exhaust that they have properly winterized their motor.
Water is drawn in thru a large hose by the raw water impeller and sent to the thermostat housing. On empty start up water will pass they the housing to the j tube , down into the circulating pump and into the block filling it to the thermostat which is closed. At this point no more will enter the engine allowing the motor to warm up to temperature. The excess water will be diverted to the exhaust manifold and out thru the muffler. When the engine temperature hits 161 the thermostat will just start to open a bit. 161 degree water will seep out the thermostat allowing impeller water to enter thru the j tube and circulation pump mix with the hot cooling back to 160 where the thermostat will close again or just remain a crack open to maintain 160. At higher rpms and temps the flow will increase and the tstat will open more if needed to maintain 160.
Therefor at idle sucking up 5 gallons of antifreeze, when the block is all ready full,is useless as most will bypass the j tube and go directly to the manifolds.
Now , there is about 3-4 gallons in the block and another 1 in the intake pipes and since any dilution of antifreeze significantly reduces its effectiveness these need to be drained
Also note that it takes 2-3 times longer for your oil to come up to temperature so it to has a cooling effect on the block coolant even when it first reaches 160
I drained all the water out of the system, and replaced all the hoses and plugs. I want to fill it with antifreeze. I have a fake a lake, and 7 gallons of antifreeze.
Whats the best way to get antifreeze throughout the system? Just run a hose from the fake a lake into a bucket of antifreeze and let the motor run til it comes out the exhaust?
Then the last question, once the antifreeze is in the motor, spray fogging oil into the throttle body to fog the motor?
Yes, use a 5 gallon bucket with your fake a lake. Remove the spark arrestor first and fog near the end of the antifreeze pickup.
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If you have catalytic converters, do not fog.
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Never been a fan of fogging.
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I got on this thread late but it is a repeat every year at this time. After 30 some years of having an inboard, I never used antifreeze. In fact, the use of RV antifreeze is rather recent and was originally used for shops to prevent people from coming back with claims. There was nothing to prevent people from using the boat after it was winterized and then failing to re-winterize. Some shops would leave lines disconnected and expect you to come back in the spring but that wasn't always the case. The antifreeze will reduce internal corrosion since the compartments are void of air but I never had any corrosion so bad as to replace any parts. Antifreeze is money and time spent with very little value added.