See full version: 5. 7 water in engine oil
If an engine is run for short periods and does not get up to operating temperature then it will definitely condensate inside the valve cover and in the crankcase some, but it will not be enough to raise the oil level. The primary manifestation of not running long enough is condensation inside the valve cover and the steam mentioned.
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Don's post was not there when I started mine, and got distracted, I like his point about it acting normal until the crankcase fills up with water+oil mix, then it comes out anywhere it can until it kills the engine. more
Re: 5.7 water in engine oil here
Re: 5.7 water in engine oil
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I am going through this right now. We were out Memorial weekend ingested some kelp / seaweed and the engine ran hot. Shut down cleared out the sea strainer engine would not start – hydra locked! Sea water in oil etc… So towed in (5Hrs) and had the boat hauled out. Engine removed and torn down for failure mode investigation. Head gasket blown between #5 & #7 cylinders, not across a water passage. Source of sea water – corroded exhaust manifold, when the engine was shut off water drained in the cylinder. So 4 weeks later and now a legal dispute starting with Safeco Insurance company, we can’t get a Volvo reman 8.1 long block due to the line shut down due to oil pressure problems, allegedly. So I take the engine home tear down to a block and had the following done; bored 20 over new pistons, crank and cam polished, new cam, main and rod bearings. Block light deck, heads reconditioned put back together.
blown head gaskets; most often due to heat, intensive job to repair because you've got to get the decks squared at a machine shop.
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coolant (water) is in many places.. it crosses near oil most apparently in the intake manifold/block/heads union. more
The water in oil question is big in industrial machinery too, especially larger speed reducers, turbo equipment, etc. Usually that is from environmental issues not a water cooling system (but it can happen). Here's the acceptable water in oil limit anyone will give you: zero. Trace amounts will evaporate at operating conditions of course, but beyond that, nothing. here
water (coolant) and oil ought not cross paths. the most common mechanical failure for this to happen is a blown gasket between the intake manifold and the heads, where the passages are. water floods the valley and pours into the crankcase.
if you pull the dipstick one day and see oil, you've most likely, and in descending order-
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Boat engine oil normally possesses a light bronze/maple color. In some cases, though, owners may notice a milky coloring in their oil. This is a troubling sign that needs to be addressed; otherwise, it could result in severe damage to the mechanical components. But what exactly causes milky engine oil? And how do you fix it?
Nine out of ten times, a milky color and consistency is an indicative sign of water in the oil. It’s not uncommon for intake gaskets to corrode and rot over time, resulting in moisture entering the oil. Inspect your engine gaskets to ensure they are solid and not leaking. Thankfully, gaskets are inexpensive and relatively easy to replace. Just take your boat to a marina or repair shop and show them the damaged gasket that needs replacing.
If you’ve tried the steps mentioned above and are still experiencing milky oil, try replacing it with fresh oil. After changing the oil, let the engine run to see if it’s better. If the problem persists, chance the oil for a second time. This should remove the majority of moisture and other impurities lingering in the engine. However, it’s not going to fix a blown head or damaged gasket. here
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