Mercruiser - 3.7 ( 470 ) Alpha1 ( please list the sources of CLEAN water in the oil ) about a cup - Antifreeze not leaking - no green in the water -

[nola mike]

I'm the king of half ass, do you have a resistor link, or the values of the resistor I would get?

Would need to know the voltage at the coil first.

And would that resistor go on the voltage line to the coil?, Also is there a link to cheap ass a voltage regulator? Part numbers?
The issue is I'm flat ass broke this year and lucky to be in the water

Do a search. Like Bigfoot, unsure if it actually exists. Every few years someone comes up with a solution, claims it works, and then disappears. Last I saw I think was a regulator for a motorcycle. I mean, it *should* be possible, plenty of machines with stators on them converting AC --> 12v DC. Or cars with alternators that have external voltage regulators/rectifiers.

 

[ROY WILLIAMS]

Mercruiser - 3.7 ( 470 ) Alpha1 ( please list the sources of CLEAN water in the oil ) about a cup - Antifreeze not leaking - no green in the water -

I was changing the voltage regulator stator higher volts ,,, then I was alternator ....
also the exhaust elbow of that exhaust, inspected it ...I did my exhaust elbow rusted it .. you are that elbow antifreeze and the ports of that sea water elbow ports ..doing the dropping out of that antifreeze ...then inspect it of that elbow ...
I did my MCM470 1978 ...fixed it ...

 

[nola mike]

But the water that exits the Heat Exchanger has to be sent thru the elbow to exit over board, correct? If there is a rusted thru area then the water can get into the exhaust gas passage & then into the cylinders/motor oil.

Yes, if that gasket fails between the mani/elbow, or if the elbow corrodes (manifold is aluminum on later models, lasts longer) that can also let fresh water into the exhaust.

 

[flashback]

Mercruiser - 3.7 ( 470 ) Alpha1 ( please list the sources of CLEAN water in the oil ) about a cup - Antifreeze not leaking - no green in the water -

No such thing..

 

[flashback]

AI. Is not welcome

 

[Lou C]

Yes, if that gasket fails between the mani/elbow, or if the elbow corrodes (manifold is aluminum on later models, lasts longer) that can also let fresh water into the exhaust.

That’s what I was trying to say!

 

[nola mike]

That’s what I was trying to say!

I know, I was agreeing with you!

 

[chatvmax]

I know, I was agreeing with you!

Thank you all for the help..
This is what i found
1 - before disassembly - i can see a leak down the side of the exhaust manifold,
2 - better picture of elbow leaking,
3 - lots of discussion of rotting elbow OR cracked elbow -BUT i can clearly see a MACHINES hole for the sea water to exit inside the exhaust port , it looks sort of down stream of the motor - like water would actually have to travel back up and then back down into cylinder's,
4 - Picture of the elbow removed with the wire showing the path for river water to enter into the lower section and out the exhaust,
ALSO the gasket was failed BIG TIME ,, actually in pieces back by the clear water end,,
5 - picture of manifold removed,,, the castings look great, should mate back up with no issues..

QUESTION - could this be the source of the clean water making its way into my oil OR should i continue to tear the exhaust manifold off -
PS i see no other places where there is leaking....

Thank You yet again for any advice

 

[nola mike]

OK, going to revise my earlier statement. Failed gasket can cause AF to leak into the exhaust, not raw water. A corroded (rusted through) reservoir can cause raw water to enter the exhaust I believe, but it's been a while since I've looked at one of those reservoirs. Manifold has no raw water going through it, so shouldn't be an issue. Corrosion of the manifold surface, again, would have you leak AF.

 

[chatvmax]

OK, going to revise my earlier statement. Failed gasket can cause AF to leak into the exhaust, not raw water. A corroded (rusted through) reservoir can cause raw water to enter the exhaust I believe, but it's been a while since I've looked at one of those reservoirs. Manifold has no raw water going through it, so shouldn't be an issue. Corrosion of the manifold surface, again, would have you leak AF.

" A corroded (rusted through) reservoir can cause raw water to enter the exhaust I believe "
_ its actually cut - or machined into the elbow - not rusted through -
it looks like raw water actually gets pushed through the elbow - reservoir and out the exhaust from the voltage regulator path,,,,, all be it past the area where it would fall back down into the cylinders - it actually looks like it would drop out of the boat down the exhaust bellows....

ok... so ill replace this gasket because i have it apart and it has clearly failed,,, BUT from the water flow chart i dont see a source for clean water to be in the oil...... wtf
it doesnt even appear to me that a bad head gasket OR a cracked intake OR exhaust would be letting clean water into engine oil..... hhhmmmm,,, but again i am NOT a boat mechanic

 

[nola mike]

" A corroded (rusted through) reservoir can cause raw water to enter the exhaust I believe "
_ its actually cut - or machined into the elbow - not rusted through -
it looks like raw water actually gets pushed through the elbow - reservoir and out the exhaust from the voltage regulator path,,,,, all be it past the area where it would fall back down into the cylinders - it actually looks like it would drop out of the boat down the exhaust bellows....

Yes, that's what it's supposed to do. Raw water into the exhaust to cool it. I don't remember where the raw water circulates within the reservoir, here's a pic of mine years ago that had corroded through. Not sure if the leak is AF or raw water there though.

ok... so ill replace this gasket because i have it apart and it has clearly failed,,, BUT from the water flow chart i dont see a source for clean water to be in the oil...... wtf
it doesnt even appear to me that a bad head gasket OR a cracked intake OR exhaust would be letting clean water into engine oil..... hhhmmmm,,, but again i am NOT a boat mechanic

Correct. Only thing is make sure that it's actually water and not AF. Easy enough to keep your eye on the coolant level. If it's dropping, don't ignore it.