mercruiser drain plugs

[Alrob]

winterizing mercruiser 350 magnum (5.7 ltr 300HP)

can anyone help me I need to drain off block etc but cant remember how many blue drain plugs there is for this engine. last year I got the local engineer to do it and I think there was 5 blue plugs can anyone with this engine confirm this

cheers

 

[spannerman]

There is for each manifold underneath in the center, and one each side of the motor block to the rear of the engine mounts.
But why drain it off, its more usual to run the engine on a hose to flush it, then connect a funnel and hose to the water muffs, and mix up a couple of buckets 50/50 water antifreeze and pour this in until it comes out of the exhaust and shut down, then its protected against frost and corrosion. Whereas if there is air and some water in the block it will rust.

 

[Alistairr]

[ QUOTE ]
its more usual to run the engine on a hose to flush it, then connect a funnel and hose to the water muffs, and mix up a couple of buckets 50/50 water antifreeze and pour this in until it comes out of the exhaust and shut down,

[/ QUOTE ]

How do you run the engine with Muffs and a hose when its still in the water?

Al.

 

[David2452]

[ QUOTE ]
[ QUOTE ]


How do you run the engine with Muffs and a hose when its still in the water?

Al.

[/ QUOTE ]

Raise the drive, put a small plastic bin over it, lower the drive & bin, pour mix in the bin and run for a bit.

 

[Alrob]

thanks spannerman, my last boat (5.7 ltr EFI 260HP) had the 4 plugs as you describe plus I had to remove hose between thermostat housing & circulating pump) + 2 other hoses underneath but this engine is different I can only find block plugs on port side only & there is no plugs under exhaust manifold, perhaps I will go and speak to the chap that done it last year.
BTW great idea with antifreeze - as boat is out the water should be easy to do

 

[ported0]

you missed a great day yesterday it was flat calm, in fact swmbo fell asleep on the lounger half way to Ardrossan and that was at 26 knots.

john

 

[Alrob]

hello John

yes it was nice - Taz-Too was lifted out at 10.00am so we spent the day on the hard standing - never mind only 5 months till launch ! /forums/images/graemlins/frown.gif /forums/images/graemlins/frown.gif /forums/images/graemlins/frown.gif

 

[bfwilliams]

newbie to this forum and was interested in your last comment. how does the antifreeze fill the block if the thermostat is still in? wont there stillbe fresh water in the block?