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Old 04-05-2012, 11:55 AM   #1
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Default milky engine oil

I just has the mainfolds replaced on my 7.4 MPI and had sea water in my motor oil.

The engine is fresh water cooled, with no loss in fluid, and the plugs are clean and dry, so its not a cracked bloack or leaking head.

I'm guessing my oil cooler which is feed by raw water is leaking.

I noticed oil slick floating behind the boat, luckly i had change the oil and the boat only moved 30 feet to the slip.
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Old 04-05-2012, 01:36 PM   #2
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Alright...I'm no mechanic, but none of that sounds good.
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Old 04-05-2012, 02:11 PM   #3
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Yes, that why changing oil in the fall is a good idea, so if you had water, it would not sit in the pan all winter and rust.

I had change the oil weeks before, but the oil cooler is 12 years old, and you have high pressue oil running thu a heat exchange in the raw water line.

The oil is at a higher pressure and will push oil into the raw cooling low pressue, and when you stop the engine it will seep back.

also note, you have a fuel cooler, and a power steering cooler doing the same thing.

better it happen now then out on the high seas.....
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Old 04-05-2012, 09:12 PM   #4
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ok, took the oil cooler off and pressure tested it to 60 psi, all seam fine, put it back on.

Drained all the oil from the pan screw, and changed the oil filter.

Since I'm not losing anti freeze in my fresh water cooled engine block, I'm guessing its my new exhaust mainfold I has just installed.

I'm going to refill the oil, drop the water hoses to the mainfolds and run the engine a bit and then see if the oil stay clear.
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Old 04-06-2012, 02:07 AM   #5
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I'd remove the exhaust manifold and regasket it....I'd also use a can of engine gunk in the oil and run it for about 15 min at idle on muffs.....this stuff is super detergent and will remove any crap in the crankcase....then change the oil/filter again..then run it to see if you get milky oil again....


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Old 04-06-2012, 03:08 PM   #6
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Even in a FWC, the Oil Cooler, heat exchanger manifolds and risers are all typically RWC. If you weren't getting water in the oil prior to manifold/riser replacement, I'd still be suspecting those. Maybe a bad gasket, possible 'resonance reversion'. This is essentially the water working it's way in backwards. I had a friend who had a similar issue whenhe replaced with Osco instead of Merc. Replaced with Merc Manifolds and Risers and it seemed to solve the issue. I'm not saying that is your problem, nor do all Osco's do that. It's just an example.
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Old 04-06-2012, 03:09 PM   #7
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BTW- I would drain that oil ASAP and start doing oil changes. Run it for 15-20 min. then change the oil again. I'd do this quite a few times. I did 7 oil changes when I got some water an engine.
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Old 04-06-2012, 03:14 PM   #8
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Quote:
Originally Posted by shrew View Post
BTW- I would drain that oil ASAP and start doing oil changes. Run it for 15-20 min. then change the oil again. I'd do this quite a few times. I did 7 oil changes when I got some water an engine.
that's why the engine gunk....super high detergent that cleans everything it touches....don't need to do several oil changes with this stuff...


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Old 04-06-2012, 06:26 PM   #9
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the four port side spark plugs were wett...... so mr. marina man who never seen an new install mainfold leak, JUST SAW ONE LEAK....

so he owe me for the $120 oil change, the new spark plugs for the miss, and two days of my time..... and a new manifold.

the boat really did not start our run well on four cylenders, so their was not much time to get a lot of water in the engine.

Still, i will run it, the change it again, and see if that clears up.

these guys want to get paid and wash their hands with it, and blame it on a crack in the block....
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Old 04-12-2012, 08:39 PM   #10
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so, just had the new mainfold pressure tested, and it did not leak.

it appears to be the 6" rise between my new elbows to my new manifold.

so, now going to replace those.

I'm thinkin, my next engine will be a steam driven out board, not sure if if a rear wheeler or side wheeler....
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