Exhaust Manifold Concern

[imported_wildcat]

I am a newbie at all of this and I need to verify that if I pour antifreeze into the cooling hose that goes from the thermostat to the bottom of the exhaust manifold that the antifreeze will go out the exhaust hose to the prop and not into the cylinders, if the engine is not running. I have a 5.0L MPI engine. It appears that the fluid goes through the exhaust manifold, around the elbow, and does not mix with the exhaust until it reaches the aft end of the elbow. This allows gravity to ensure that the fluids drain out the prop and away from the engine.<br /><br />I have owned a waverunner for many years and if the engine is not running, the fluid will backup into the cylinders.

 

[crazy charlie]

Re: Exhaust Manifold Concern

If thats how you are going to winterize it will be fine.You will need to remove the thermostat so the antifreeze will drain down into the block.Then you can take off the hoses and pour antifreeze into them.Pour it in with the flow of the cooling ststem and not against it and you will be fine.Personally I use a winterizing kit that i got at west marine for $29 that is a tank with a hose adapter and earmuffs.It is so much easier and faster and cleaner than the way you are going about it.Charlie

 

[tommays]

Re: Exhaust Manifold Concern

i dont no how you could get in enough antifreeze to make it flow up through the riser unless it was pumped<br /><br />if you do a search there are many threads on how people get antifreeze safely through the cooling system for winterizeing<br /><br />tommays

 

[imported_wildcat]

Re: Exhaust Manifold Concern

I already purchased the 5 gallon tank at West Marine. Since it is so simple, I thought it would give me peace of mind to just take the three hoses off the thermostat and fill them with antifreeze after using the tank. I just wanted to make sure the fluid would not go down into the cylinders.<br /><br />So, if I understand tommays comment, the only way to get fluid down into the cylinders would be if water backed up above the elbow. The exhaust system is also setup so that all cooling hoses dump the water aft of the engine manifold so that gravity drains it away from engine.<br /><br />Thanks so much for your patience. Crazy Charlie also stated what I always wanted to hear, always add the antifreeze so that it drains in the direction of the cooling system.<br /><br />I don't have very good access to the PS cooler or the check valve, so the tank approach is the only way to ensure good flow of antifreeze everywhere. This is in addition to already having the new single point drain system.<br /><br />I want to sleep calmly on cold nights.

 

[imported_wildcat]

Re: Exhaust Manifold Concern

My concern about flooding the cylinders is due to being around 2-cycle Waverunners. If the exhaust is not blowing out the coolant, the coolant floods the cylinders. It appears that this does cannot occur. Why?

 

[tommays]

Re: Exhaust Manifold Concern

in the manifold and the riser the water and the exaust are in two different chambers the water surrounds everything and just keeps the manifold from getting hot <br /><br />after the water goes throgh the manifold and the riser and is headed back down the water and exaust gasses get mixed and unless something is bad they wont go in the cyl<br /><br />tommays