Winterizing 7.4 Merc. inboard

viking

Recruit
Joined
Sep 25, 2001
Messages
1
Hello,<br />I have been wanting to winterize my engines for several years, but have a couple of concerns which I will list after the procedure I observed from yard mechanics at my marina. It appears to be very easy and I think I'm up to the challenge. I would appreciate any advice.<br /><br />1. Open engine strainer and run water from hose, start engine and run until operating temperature is obtained.<br /><br />2. Drain manifold and block on each side of engine (1 per side), use a solid core wire to probe openings for blockage, replace manifold petcock and block plug.<br /><br />3. Remove fuel filter and remove approx. 1/2 inch of fuel and replace with 2 cycle engine oil (engine is fuel injected, I observed yard mechanics doing this to fog).<br /><br />4. Replace garden hose with a hose connected to a 5 gallon bucket of -100 degree marine engine anti-freeze. Start engine and run until anti-freeze is gone.<br /><br />That's what I observed. My concerns are as follows:<br /><br />1. When the boat is in the water. Water is discharged from the sides of the boat. I have not been able to get the boat to do this out of the water from the strainer (with hose)or with a "fake a lake" device from the underwater intakes. I believe water is discharged from the exhaust manifolds and I cannot develop enough pressure to do this out of the water. By draining the manifolds and block do I have to worry about anything in this area?<br /><br />2. After replacing the manifold petcock and block plugs then running anti-freeze through the engine. Should I drain them again?<br /><br />3. Is there any advantage by just draining the block and manifold and filling the block with anti-freeze through the thermostat fitting? If I use this procedure, do I have to remove hoses from the bottom of the engine to drain? Do I just fill the block until anti-freeze comes out the thermostat fitting?<br /><br />Sorry for the long post, but I want to be sure.<br /><br />Thank You.
 

martinwinte

Petty Officer 3rd Class
Joined
Aug 23, 2001
Messages
88
Re: Winterizing 7.4 Merc. inboard

I have no idea on #1<br />BUT #2 and 3 what I do is to drain the block (and reinstall plugs) then fill the manifold, remove the t-stat and fill the block from there (no hoses need to be removed) change your lower unit oil, the engine oil, fog the carb, spray the whole thing down with wd-40 and you are done.
 
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