winterising questions on 140hp merc stern

[mphy98]

does the block antifreeze and exhaust coolant mix? dumb question but i did not think that the engine was a sealed system as there is no radiator? thanks bob

 

[Bondo]

Re: winterising questions on 140hp merc stern

Ayuh,....

Your Question is more than just alittle Vague.....

When running across the lake,... There is No antifreeze,+ both the block,+ exhaust are lake water cooled...

As to which 1 gets antifreeze,+ When, when winterizing,...
That depends on How you're doing it....

 

[jerryjerry05]

Re: winterising questions on 140hp merc stern

Like Bond-o says it all comes from the lake or garden hose.If you leave ANY water in ANY part of that boat before you add anti-freeze you will probably have a cracked something next spring.
The o/d picks up water and pushes it thru the motor and out the manifold/riser.There are links on how to winterize on this site.
If in doubt ask someone or put a light in your bildge till your sure.Jerry

 

[mphy98]

Re: winterising questions on 140hp merc stern

sorry guys, my dad says the block has anitfreeze in it permanatly and the exhaust manifold acts like a radiator. i thought the block and manifold all took in fresh water. is this incorrect? is the 140hp 1979 vintage a closed system except for the manifold?

 

[Bondo]

Re: winterising questions on 140hp merc stern

Ayuh,...

It sounds more like a 470, than a 140.....

Do you have a serial # or some pictures....

Your description it's adding up.....

 

[Don S]

Re: winterising questions on 140hp merc stern

You could also have a 140 with a closed cooling sytem on it that may or may not include the exhaust manifold.
Pictuers are worth a thoussnd words.
Do you have some pics of your engine you could share?

 

[mphy98]

Re: winterising questions on 140hp merc stern

hey serial number is4798084 and it is a 140 merc sterndrive, thanks guys. just wanted to know if it is a partial closed system. thanks again bob

 

[Don S]

Re: winterising questions on 140hp merc stern

SN won't help in this case, too old. Could still be a 470 or a 140. BUT, since you say it is definatly a 140 that's good enough.
Your engine is somewhere between 76 and 79 somewhere near the middle I would guess.
Back then, Merc didn't have closed cooling on the 140. So you probably have an aftermarket system.
As I said before a picture is worth a thousand words, and trust me, boats don't have radiators. Heat exchangers (cooled with outside water) but no radiators.

 

[mphy98]

Re: winterising questions on 140hp merc stern

thank you, it is a 1979 merc, i found a exhaust drain at the rear of the manifold 11mm and it drained out all the rest. thank you again bob ps wouldn't know how to post picturs, old dog you know 54 years old. barley can use this thing