new to winterizing inboard Mercruiser

[oddysea1]

I am looking to winterize and fog out my inboard 350 magnum fuel injected Mercruiser. My question is, will the water pick up at the bottom of the bilge draw in antifreeze with the external seacock closed? Also do I spray the fogging solution into the uncovered flame arrestor? Any advice or tips are appreciated-Thank you

 

[alldodge]

will the water pick up at the bottom of the bilge draw in antifreeze with the external seacock closed?

Assuming closed cooling???
Do you have a sea strainer?

Do not spray fogging oil in a fuel injected motor. Disconnect the fuel line going to the fuel filter. Mix up gas and 2 cycle oil is mixed up and connect it to the fuel filter. Run the motor to warm it up with the mix, change the oil and the motor is fogged so to speak.

 

[Lou C]

Judging by the questions you are asking I suggest that you get a Merc manual and follow the steps, there is a lot that can go wrong if you don't have the right information. For example, if you don't have closed cooling you should not be using method that sucks antifreeze up into the engine, you can if you have closed cooling. What do you have?

 

[oddysea1]

Judging by the questions you are asking I suggest that you get a Merc manual and follow the steps, there is a lot that can go wrong if you don't have the right information. For example, if you don't have closed cooling you should not be using method that sucks antifreeze up into the engine, you can if you have closed cooling. What do you have?

It is a closed cooling system-one challenge I am experiencing is getting to drain plugs [very tight area] can I just run antifreeze through the sea strainer to winterize all necessary components of the engine. I am in the process of purchasing a manual. Also any advise on fogging the fuel injected engine - one suggestion from previous post already given and appreciated.

 

[alldodge]

It is a closed cooling system-one challenge I am experiencing is getting to drain plugs [very tight area] can I just run antifreeze through the sea strainer to winterize all necessary components of the engine.

Yes, but (always a but) the issue is getting enough volume in the strainer. Just winterized buddies twin 454's inboards yesterday. We pulled the line off the strainers and place in a 5 gal bucket. Fill with RV AF and start motors and it pulls it thru

 

[Scott Danforth]

with heat exchanger cooling, you dont need to worry about the block and heads, only draining the heat exchanger, the exhaust manifolds and the plumbing from the drive to the heat exchanger

for an MPI engine, you dont fog, you run about a gallon of 50:1 mix thru the engine

it is all covered in the appropriate manual for your boat.

Mercury Marine Parts Accessories and Manuals

 

[Bt Doctur]

"350 inboard" meaning a true inboard and no outdrive?
per post #6 is the way to go. Some full fresh water cooled systems include the manifolds but not the elbows. Elbows need draining and if no drains a shop vac to blow air into the hose and then fill it with some AF.
a "cocktail fuel mix" plugged into the fuel inlet at the fuel sep
2 stroke oil, fuel stabil, marvel mystery oil, and fresh gas
in a outboard tank

 

[QBhoy]

If it’s an mpi. Don’t spray fogging oil in it...as said. I mix 50-1 or 40-1 roughly. The manual from memory suggests a little stronger, but I don’t like the idea of any more than I do.
I might also add that in general...best not to induct AF in through the outdrive. Recipe for disaster to the unthorough.