antifreeze through manifold

[imported_wildcat]

I am a newbie with a 5.0L V8 with dry joint exhaust manifold with no risers. I have the single point drain system that I will use to get water out. I then want to pour antifreeze into the 3 hoses that I have connected to thermostat. The one hose goes to the water pump. The other two hoses go to the bottom of the exhaust manifold. <br /><br />My question is that if I pour antifreeze into the two hoses to the exhaust manifold that the antifreeze will drain up through the risers and out the exhaust ducts to the prop and not have the potential to find a way down into the cylinders. It is my understanding that the antifreeze will not mix with the engine exhaust until it is at a point below where gravity will allow it back into the cylinders.<br /><br />Please help another newbie.

 

[Bondo]

Re: antifreeze through manifold

You state,<br />

5.0L V8 with dry joint exhaust manifold with no risers.

Then you ask,<br />

if I pour antifreeze into the two hoses to the exhaust manifold that the antifreeze will drain up through the risers and out the exhaust

Now I'm All Confused..... <br />Is there a Name on this motor ?????

 

[tommays]

Re: antifreeze through manifold

the only way water makes the full trip out to the exaust is buy getting pumped it just wont gravity flow to a point that is higher than were it starts<br /><br />for the most part if you drain the motor of all water you dont have anything to freeze and dont have to worry about spiling antifreze all over the place<br /><br />tommays

 

[imported_wildcat]

Re: antifreeze through manifold

Is there a name for this motor? I don't know why the experienced people always see the need to embarass the newbie. I just wanted some help. This forum has always been helpful, but at times the comments are unwaranted.<br /><br />Yes, it is a 5.0L MPI 260 hp Mercruiser I/O with a dry joint exhaust manifold. The seawater is routed around the exhaust manifold using a separate gasket (dry joint). It is therefore referred to as a dry joint and not wet joint, which uses the same gasket to separate the seawater and engine exhaust.<br /><br />I have no risers. I guess they are not necessary on an I/O Searay.<br /><br />To further clarify, if I disconnect the hose at the thermostat (that runs from the thermostat to the lower side of the exhaust manifold) and lift the hose so that I am pouring antifreeze into the hose at an elevation above the elbow, gravity will allow the antifreeze to drain UP through the exhaust manifold and elbow and out the exhaust hose.<br /><br />I just wanted to verify that the seawater will not have any potential to get back down into cylinders.

 

[tommays]

Re: antifreeze through manifold

i dont think anybody is trying to embarass you it clerly states on the fourm to ID you motor as compleatly as you can<br /><br />many makers use a 5.0 and even that fact that it is and MPI instead of a carb motor could compleatly change how something should be done<br /><br />you do have a riser/elbow combo its just not nessary on your boat to add any more riser to get above the waterline to the correct hight<br /><br />the water from the manifold and elbow do not meet the exaust gas until they are on the way down a riser is compleatly self draining <br /><br />bondo and myself are belivers in the drain your motor and store it dry method <br /><br />if you do a search the antifreeze way is in many posts<br /><br />tommays

 

[imported_wildcat]

Re: antifreeze through manifold

Tommays,<br />Thank you very much. You have been very helpful but with the configuration of this engine (single point drain system), alot is different. I have had a problem with finding appicable historical data on this forum because it is a new engine. <br /><br />The manuals also tend to be very unspecific on the use of antifreeze, but recommend it. <br /><br />I am from the 2-stroke waverunner world and the susceptibility of raw water in cylinders is common.<br /><br />Based upon your statement, I will not worry about the antifreeze getting into cylinders when filling hoses from thermostat.

 

[Scaaty]

Re: antifreeze through manifold

If I were you Wildcat, I would take this boat to a dealer and pay him money to get the correct knowledge. These forums are great, but a little knowledge run amok can get expensive, and all boat/motors combos are different in subtle ways. As any mechanic will tell you, "You can pay me now, or (really) pay me later" .Good luck, and don't let some of us sourpusses get ya down...we have bad days too!

 

[imported_wildcat]

Re: antifreeze through manifold

Robby,<br />Thanks for the suggestion but I already talked to the Mercury dealer and he said they just open the drain plugs. They don't use antifreeze and don't know why or how to do it. Since they don't do it, they never thought about it. No dealers in this area of Georgia use it because the temperatures rarely get below 20F, but I also want to use it to ensure no pooling of water and for corrosion protection. I may just hook it up to the 5 gallon flush tank and cycle antifreeze through it.

 

[crazy charlie]

Re: antifreeze through manifold

Now you are making good sense Wildcat!!!!Thats the way I winterize and it could not be easier.I bought the kit at West marine for about $29 and it has a switch over valve which allows you to run on fresh water until the stat opens and then switch over to antifreeze.It could not be easier!!To do it correctly you will need to change the oil first and then be ready to fog through the carb as the antifreeze runs to the bottom.Make sure you stall the motor BEFORE the antifreeze runs out so the impeller in the drive does not run dry.Charlie

 

[Bt Doctur]

Re: antifreeze through manifold

Fresh water cooled or raw water cooled.<br />You really do have risers on that motor unless you installed open headers that exit above the rear deck.

 

[Bondo]

Re: antifreeze through manifold

Is there a name for this motor? I don't know why the experienced people always see the need to embarass the newbie. I just wanted some help. This forum has always been helpful, but at times the comments are unwaranted.

I'm not trying to embarrass Anybody........<br />I'd Loved to have answered your Question..........<br />However, Before I'm going to Try that,We've got to be talking the Same language.....BTW, You Do have Risers.....<br />I also Need to Know What I'm Talking About.......<br /><br />I'm Sorry..........<br />I promise, I'll Never embarrass You again.....<br /><br />Good Luck...

 

[imported_wildcat]

Re: antifreeze through manifold

CC,<br />After getting the stat opened with fresh water, do you pull the drain plugs to allow the water to drain out prior to flushing with antifreeze or must you immediately flush with antifreeze to keep the thermostat from closing?<br /><br />Thanks for your help.