5.0GI oil high on stick but looked fine changing it only pumping out milky oil now?

[firebird1158]

I have a 1998 Doral 300SE with twin VP 5.0GI engines and was checking oil levels and noticed one had too high oil level but looked and smelled fine. I was thinking someone overfilled it as boat is new to me this season and couldn't remember what the level was when picking up boat, just remember it was clean...

Anyhow i'll give you some history, picked up boat and starter on this engine(port) was loud starting engine and slow, owner blamed low battery. I knew it was the starter dragging at worse worn teeth on flywheel(which i could live with and fix). Well after arriving home from my 12 hr drive with my new boat the problem seemed to worsen and refused to start a few times so i pulled the starter which was a little loose and found 2 broken teeth on ring gear. My biggest fear(at the time) because would have to pull motor. I tightened starter up and boat started again with the usual noise but noticed high oil level.

My intent was to just pullout some oil to get the level where it should be and recheck all guages(oil pressure and engine temps have all been good since getting boat).

Well I decided to give boat a good run and recheck again and everything looked the same too high on dip stick but clean and smelled normal.... So while oil is hot i wanted to pull some out but after inserting my new oil extractor it began to very slowly pump out very milky oil????

So now I am at a loss as to what has happened as the oil should be milky if there was water in the oil pan wouldn't you think? any ideas would be greatly appreciated as to how to proceed. Manifolds on both engines look almost new and owner even through in an extra set as he appearently keeps an extra set just in case....

 

[Maclin]

Re: 5.0GI oil high on stick but looked fine changing it only pumping out milky oil no

My first guess is internal block cooling passages cracked from improper winterization, and cooling water is leaking into the crankcase under pressure while engine is warm.

 

[firebird1158]

Re: 5.0GI oil high on stick but looked fine changing it only pumping out milky oil no

I am afraid that might be the problem but can't understand why the oil looked good and smelled good on dipstick until I tried to pump it out, I would think that after running it the oil would all be milky.... The water shouldn't sit under the oil and not mix with engine running?? Obviously the oil got in there from somewhere, either intake, block or head, many manifolds but lost as to why it looked ok(but a little high)on dip stick..... thanks for insight though

 

[HalfFish5087]

Re: 5.0GI oil high on stick but looked fine changing it only pumping out milky oil no

Here is my guess. My dipstick on the 5.7GSPBYC does not enter the pan, but the tube runs all the way under pan and connects where the drain plug would normally be. I could see that the oil in the tube doesn't really mix with oil in the pan until you start pumping it out. As I remember checking mine and it looking good and clean, but after a few pumps to change the oil it looked black and dirty after a few pumps.

 

[firebird1158]

Re: 5.0GI oil high on stick but looked fine changing it only pumping out milky oil no

I think you are right... I checked under the valve cover and there is milky oil in there as well. So now the task of trying to find where the water is getting in the engine????? Any help or ideas of where to start would be greatly appreciated.....

Here is my guess. My dipstick on the 5.7GSPBYC does not enter the pan, but the tube runs all the way under pan and connects where the drain plug would normally be. I could see that the oil in the tube doesn't really mix with oil in the pan until you start pumping it out. As I remember checking mine and it looking good and clean, but after a few pumps to change the oil it looked black and dirty after a few pumps.

 

[firebird1158]

Re: 5.0GI oil high on stick but looked fine changing it only pumping out milky oil no

I am thinking that with the broken ring gear tooth that somebody hydrolocked it from water leaking in cylinder from a manifold and some is sitting on piston and making it's way slowly past rings into oil????? At last hoping that's what it is at this point anyway!!

Can you pull the manifolds with the boat still in the water? or will you get back flow?

 

[HalfFish5087]

Re: 5.0GI oil high on stick but looked fine changing it only pumping out milky oil no

before pulling the manifolds, I would conduct a compression and leak down test to try and weed out what is happening.

 

[Maclin]

Re: 5.0GI oil high on stick but looked fine changing it only pumping out milky oil no

Water takes a long time to leak past the rings, and in fact will usually just stay there and rust the rings to the cylinder wall if not pushed out the spark plug hole. And the volume is just not there from hydrolocking. The most likely source for a lot of water is from leaking internal coolant passages. Sometimes they wont leak until run hard as you mentioned, but have been ok with no load.

A cooling system leak down test will show if the block is compromised internally or not, it must be pressurized past 15psi and see how long it can hold pressure. It should not leak down at all in actuality. It is a challenge to block off everything and perform this test with a raw water cooled engine.

A compression test will not reveal a problem with cracked passages, but could show a head gasket sealing problem. A cylinder leak down test would not be of use when trying to troubleshoot cooling system integrity.

 

[safiauto]

Re: 5.0GI oil high on stick but looked fine changing it only pumping out milky oil no

i have the same problem which i figure out yesterday i am going to change the manifold gasket because when i turn the engine manually it was very hard to turn that why my starter get damage i some water came out from the spark plugs the boat was very heavy when i try to speed the starter jammed.

 

[firebird1158]

Re: 5.0GI oil high on stick but looked fine changing it only pumping out milky oil no

Well I pulled all my plugs today and I have water on the right hand plugs. All four were wet and rusty. I had changed the oil a few times and all appeared to be fine and engine was running great except for the missing flywheel tooth! but it grew some oil again this weekend and was getting hard to start again. After getting in along side the port motor the manifold where it meets the riser is all rusty on the outer side and appears it was leaking or does. I can not get the riser detached as of yet and will have to bring a rubber mallet tomorrow. So do you guys think it is the riser or gasket leaking or the manifold? If it was manifold I would think it would only be a certain cylinder and not all four?? I am attempting this with the boat in water so I should beable to take off riser without back flow right? What about manifold??

 

[bruceb58]

Re: 5.0GI oil high on stick but looked fine changing it only pumping out milky oil no

You can take the manifold and riser off in the water. As long as the exhaust hose going to the riser is above the water level, you are fine. There should be no flow past the raw water pump.

Sure sounds like you have at least have a bad manifold/riser connection or bad manifold.

If you had freeze damage, its possible that it damaged both the engine and the manifold which would explain higher oil level and water on top of the cylinders.

You may want to pressure test the block while you are at it.