please help,water in oil

[bishop12]

Hello all, I have recently built 350 for my 86 supra sunsport skier inboard. Breaking it in on the water hose seemed to run great just a little slow cranking like it was out of time or something. after alot of troubleshooting found that all of the cylinders on the right side of the engine(standing in front of it were full of water and the crankcase also. WellI pulled the intake off and fund that the egr crossover was full of clean water not milky at all. I cant figure out how all of the cylinders on that side would be full of clean water. Doesnt seem likley that there would be a crack in every cylinder.The only way that I can figure is that he water is coming in thry the exhaust valve. Can anyone shed some light on this? Thanks im puzzled.

 

[HT32BSX115]

Re: please help,water in oil

howdy,

first of all, you really need to have a look at the "Adults Only" sticky above.

Post your engine make, model number and serial. It'll make it a little easier for all of us to help!

I had a similar problem with my old OMC 460. I had a leaking riser gasket that would leak into an open exhaust valve once the engine was shut down.

If I tried to start it about 15-30 min later it would hydrolock. If I waited a couple of hours, or over night it would crank and start normally.

If you have a cracked or failed exhaust manifold, riser or riser gasket, you will have this type of problem. If you have a couple of open exhaust valves there's a path for water to run into the cyls with open exhaust valves.


Also if you park a boat on the beach and you get a few big waves on the stern, you can sometimes get water into the exhaust system thru the risers if the flappers (shutters for a sterndrive y-pipe) are missing/defective.


regards,


Rick

 

[bishop12]

Re: please help,water in oil

Ok, I see, I didnt look at that because I thought it was "adult only content" and my kid was setting beside of me. We the boat originally came with a 454 but had been converted to a 350 which had been blown also. This is where I came in to the picture. I purchased the boat with the blown engine and decicided to just build a new one seeing how it had already been converter. I did make sure I was using all marine material to do the build. The exhaust manifolds were brand new also, but I have seen a few things on the boat that had been cobbled up that I have put back the way that they should be. I really dont understand the hole riser deal and how it functions but I did get a box of parts that came with the boat and it looks like what could be new riser gasket in the bottom of it. I will pull the manifold off tommorrorw and do a really good inspection of it all. Does anyone have any creative ideas as how to get the engine cleaned back up. would draining it putting fresh oil in it a few times be sufficient.

 

[ziggy]

Re: please help,water in oil

i don't have a lot of insight for you. but here's a interesting read for you perhaps...
http://www.boatfix.com/merc/Bullet/01/01_13.pdf

that pdf saved my bacon when i had water intrusion... fwiw, mine was from a bum manifold..

 

[bishop12]

Re: please help,water in oil

Very helpful link, what do you guys think about re using the head gaskets, they have less than 1 hr total run time on them. Also has anyone ever user regular automotive head gaskets and had any success with them. Just trying to save a little money so the wife doesnt kill me.

 

[ziggy]

Re: please help,water in oil

don't reuse head gaskets. once crushed, there done. a 1 use item...

i'm not sure about auto vs marine head gaskets. someone else that knows more than me will have to let you know the facts on that. i'm thinking, maybe, technology may have made the auto ones ok to use now. but like i say, i don't know the facts on that part of your question. i believe it used to be that the marine ones had stainless steel in them to help prevent corrosion... don't know if that's true these days though.. personally, i'd use marine. just on general principles. head gaskets a mighty important item that ya don't want to have fail...

 

[bishop12]

Re: please help,water in oil

Ok, A friend of mine that had some marine courses told me that the procedure that you start and stop your engine will cause your engine to take water on. He said that if you kill the engine with the hose still on then the water that is left in the exhaust manifolds have no where to go but down into the heads. That really makes alot of sense to me. He is telling me to do a compression check to see if I have any bent valves,blown head gaskets and if not put it back together and change the oil and monitor it. Any thoughts on this?

 

[J. Mark]

Re: please help,water in oil

I disagree with your friend. If you shut down the engine with the hose on, the raw water pump may allow some water to keep coming in, but it will just go out the exhaust pipe. The manifolds and risers are essentially water jackets around what would otherwise be a standard exhaust. There is no direct path for water to get into the engine if these parts are in good working condition.

If you have a bad manifold, riser or gasket, then his information would be correct-exhaust pressure would tend to blow water out til the engine shut down, then whatever leaks there were would drain to the lowest point and into the engine through open exhaust valves.

I would look for an intake manifold gasket leak based upon the water in the EGR passage. You might not have to pull the head or replace the head gasket if this is the culprit.

Bad manifold/riser/gasket will typically not fill all 4 cylinders.

 

[bishop12]

Re: please help,water in oil

That makes alot of sense,and I now understand how the manifold is designed but dont understand the riser part and what its purpose is. What could possibly fill all of the cylinders on that side with fresh clean water?

 

[bishop12]

Re: please help,water in oil

Figured it out, ended up be a warped head that wasnt sealing, let that be a lesson to me for trying to be cheap on the machine work. Thanks fellas for all the input.

 

[Dan1220]

Re: please help,water in oil

may I ask how you discovered that it was a warped head?