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Winterize 525's

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Old 09-25-2009, 03:11 PM
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Default Winterize 525's

Just got a boat with 525's. The mechanic at the dealer showed me 2 blue plugs on each moter. They screw out amd that is supposed to winterize the boat. It does not have the pump like the others. Of course I will check the antifreeze also. Sound right?
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Old 09-25-2009, 03:34 PM
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run anti freeze thru the entire raw water side. cheap insurance
heat up the motors and make sure the thermostats let the antifreeze run thru the entire system
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Old 09-25-2009, 04:08 PM
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they are close cooling so the motors themselves are safe,,,,, i would drain the water and run some antifreeze through anyway just to be safe with the heat exchanger,,,, cheap ins
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Old 09-25-2009, 04:10 PM
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they are close cooling so the motors themselves are safe,,,,, i would drain the water and run some antifreeze through anyway just to be safe with the heat exchanger,,,, cheap ins
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Old 09-25-2009, 06:16 PM
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dont forget the blue plug on the fuel chiller and power steering cooler
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Old 09-25-2009, 11:00 PM
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Check the closed cooling antifreeze to make sure its good to zero degrees
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Old 09-26-2009, 08:09 AM
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Exact same procedure/thought process as the 496.

Even if your engine has an air pressure system to force the water out of the engine, it's NOT good enough for FULL winterization.

Just draining the water out of a 525EFI is NOT good enough.

See this thread:
http://www.offshoreonly.com/forums/g...ing-496-a.html
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Old 09-26-2009, 09:02 AM
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Quote:
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run anti freeze thru the entire raw water side. cheap insurance
heat up the motors and make sure the thermostats let the antifreeze run thru the entire system
The tstats are on the closed cooling side, so that is not necessary. But, mine are always warm before I fill them with antifreeze anyway because I change the oil right before I fill them up. And I use the good stuff...Banfrost. Not the cheap pink stuff.

And there are alot more than two blue plugs on these motors. There are two on each header rail alone.
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Old 09-26-2009, 11:04 AM
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OK - I am going to have a mechanic winterize the boat this winter to understand these engines. Just to educate myself - there are two plugs on the headers, one on fuel chiller and power steering cooler. Any others?
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Old 09-26-2009, 11:33 AM
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yes you are right ....6 plug total
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