Water in oil

[dschuma72]

I have a 1987 Bayliner Capri 19'. It originally came with an OMC 3.0 and cobra outdrive. The previous owner put a remanufactured 2.5 in it and kept all the other original parts in the boat.

It ran pretty good the past couple years. Last fall I was out and only went about 1/2mi from the dock where I sat all day. went to fire the boat up to go back to the dock and it wouldn't start. I pulled the cover and noticed when I cranked the engine a stream of water shot out of the exhaust manifold gasket. Right on top about dead center along side the carb. I pulled the dipstick and it had a lot of water mixed in there. I think there was even water in the carb from it shooting up.

This year I pulled the exhaust manifold and took it to the local repair shop and he looked, said he saw no visible sign of cracked head ect and I shoudl just replace the exhaust manifold gasket and the gasket in the exhaust manifold elbow, and see if that takes care of it. I did that and it's not shooting water anymore, but I still have water getting in the oil.

Is that exhaust elbow the riser I keep reading about? I can't find where it says riser in any diagrams. Also I see I'm supposed to seal off the exhaust manifold and apply 15lbs of pressure to it... How would I seal off the big 5" exhaust opening?

The local boat guy thought I was nutz when I told him it was shooting water from the top of the motor like that. I saw it with my own eyes so I know it was true.

 

[dschuma72]

Re: Water in oil

I forgot to note that I must not have tightened the gasket in that elbow correctly when I changed it over. I noticed water seaping out when I had the motor running again. I put a wrench on it and tightened and the leak stopped.

 

[dschuma72]

Re: Water in oil

Anyone have an idea on this?

 

[Don S]

Re: Water in oil

I would drain the cooling system, isolate the engine from the manifold and do a pressure test of the cooling system and see if it holds pressure.
I can't see your manifold being the problem or you would have water in the cylinders and a hydrolock when you tried to start it.

 

[dschuma72]

Re: Water in oil

The plugs are getting wet. I changed the plugs and the old ones were rusty. I'm not sure what hydrolock is but is hard to start while in the water. It will crank, then make a sound what I thought was the starter disengaging. Is that hydrolock?

Also, I hook it up to the muffs and I don't get any water in the oil. I ran it for 20min and the oil was like new when I checked after being on the muffs. Put the boat in the water and run it and the oil has water mixed within a minute.

I'm really not sure where to isolate when I do the pressure test. I think I would apply pressure to where the hose from the water pump enters the exhaust manifold, then I block it off at the exhaust manifold elbow? If so how would I close off the opening at the elbow?

Thanks for the help

 

[coastalcruiser]

Re: Water in oil

From Wikipedia, the free encyclopedia


Bent connecting rod after Hydrolock
Same connecting rod, turned 90?Hydrolock (short for either hydraulic lock or hydrostatic lock) is a condition of an internal combustion engine in which an incompressible liquid has been introduced into its cylinder(s), resulting in the immobilization of the engine's pistons. The liquid causing this malfunction is often water, hence the prefix "hydro-". Hydrolock occurs in a 4-stroke engine when liquid is sucked into the engine's cylinder(s) during the intake stroke and, due to the incompressibility of the liquid, makes the compression stroke impossible. This, in turn, prevents the entire engine from turning, and can cause significant engine damage if one attempts to forcibly turn over or start the engine. Typically, connecting rods will be bent, making the engine uneconomical to repair. Confer flooded engine and vapor lock, two unrelated conditions which could easily be confused with hydrolock.

 

[dschuma72]

Re: Water in oil

Then it wouldn't turn at all if it were hydrolock correct?

 

[coastalcruiser]

Re: Water in oil

there are lots of places water can get in beside the risers.
If the risers leaked after your torqued them down then they may have internal cracks you cant see. if your in salt water then chances are your mainifolds-risers are no good.
hydrolock can happen with the wrong riser gaskets too. look in the manual under the cooling system troubleshooting section.

 

[dschuma72]

Re: Water in oil

I see. I wasn't sure that was the riser, I couldnt' find any diagram that was actually calling it a riser. Thanks a lot, with that info I can probably make more sense out of the posts I read on diagnosing this problem.

How hard should I tighten those nuts on the riser elbow if I'm using a rubber gasket? I really didn't crank too hard on it in fear of cracking something