How to pour antifreeze in without flooding cylinders?

[Fordiesel69]

It is a mercruiser 305CI. I drained the block, manifolds, and risers. Now I want to put antifreeze in but I have read if I do it wrong, water will flow into the cylinders thru the exhaust ports. What is the best way to do this?

 

[roscoe]

Re: How to pour antifreeze in without flooding cylinders?

http://forums.iboats.com/showthread.php?t=178695

 

[Fordiesel69]

Re: How to pour antifreeze in without flooding cylinders?

I know how to read and have read this several times. How do I know HOW MUCH to fill thru the hoses? And again the engine will not be running to push any out that I may overfill.


"If you are one of those that must use antifreeze instead of just draining, for whatever reason, you can fill the block and manifolds with a 50/50 water/antifreeze mix through the hoses to the manifolds and coolers and removing the thermostat and pouring antifreeze into the engine block. Many of the RV type antifreeze do not have corrosion inhibitors in them because they are meant to be used in the domestic water system."

 

[Chris1956]

Re: How to pour antifreeze in without flooding cylinders?

Add some AF with the plugs out. When the AF emerges from the drains, install the plugs and fill to overflow. The cooling system is seperate from the combustion system, so no AF will ever get into the combustion system, unless the block is cracked.

 

[Bondo]

Re: How to pour antifreeze in without flooding cylinders?

but I have read if I do it wrong, water will flow into the cylinders thru the exhaust ports.

Ayuh,... You read Wrong,... That can't happen...

 

[TilliamWe]

Re: How to pour antifreeze in without flooding cylinders?

Ayuh,... You read Wrong,... That can't happen...

Ayuh, exactly.

 

[Fordiesel69]

Re: How to pour antifreeze in without flooding cylinders?

This is great to know. How about where it mentioned dieseling after shutoff how water could get in? How is that part possible?

This part here:

"13. Bring the rpm up to around 1500 rpm and start squirting fogging oil into the carb till the rpms drop and you are getting a lot of smoke out the exhaust. Then shut off the engine. If the engine diesels, restart it fog some more, make sure the idle is very low and shut it off again. You don't want water backed up into the cylinders from running backwards."

 

[Bondo]

Re: How to pour antifreeze in without flooding cylinders?

Ayuh,... Apples,+ Oranges....

Pouring fluid into the cooling system allows it to flow with gravity....

Reversion from dieseling causes the cylinders to Suck the fluid back up from it's dump point in the exhaust flow...

 

[Fordiesel69]

Re: How to pour antifreeze in without flooding cylinders?

Good to know. Well I guess is it much easier than I thought.

Thanks.

 

[skargo]

Re: How to pour antifreeze in without flooding cylinders?

Ayuh, exactly.

Ayuh, x3