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-   -   water in oil question (https://www.offshoreonly.com/forums/general-boating-discussion/360153-water-oil-question.html)

TYPHOON 04-15-2019 02:53 PM
water in oil question
 
I have a 2000 502 MPI that has water in the oil. The risers and manifolds look ok but are original with 153 hours on it. Compression test was good. I thought it was possibly just condensation from the winter. I changed the oil and ran the boat in the water for a hour to find the oil milky again. The motor was 100% winterized. Changed the oil again and re tested same result. Is the intake manifold a potential problem on this motor?

Knot 4 Me 04-15-2019 03:01 PM
Could be intake/intake gaskets. Did the motor come up to temp? I've seen stuck tstats do the same thing in colder weather/water.

TYPHOON 04-15-2019 03:47 PM
Yes replaced the T-stat with new. Motor was running at 170 deg.

Baja Rooster 04-15-2019 03:54 PM
Is the oil filter full of sludge too? Personally, I’ve found milkshake from condensation doesn’t sludge up the filter so much.

Exhaust parts need need to be pressurized to find any issue but yours seem to be pretty low hours.

Pressure testing your oil coolers and even bypassing it for a run with fresh oil would be my next move.

madbouyz 04-15-2019 04:51 PM
[QUOTE=TYPHOON;4682230 Is the intake manifold a potential problem on this motor?[/QUOTE]

I have seen it discussed here in the past that if you're in salt water and you're not FWC the intake manifolds can have a real problem . Something to do, I think , with salt deposits accumulating in parts of the manifold due to insufficient circulation in some areas.
.
Not saying that this is your problem though .

TYPHOON 04-15-2019 05:19 PM
Originally Posted by Baja Rooster (Post 4682241)
Is the oil filter full of sludge too? Personally, I’ve found milkshake from condensation doesn’t sludge up the filter so much.

Exhaust parts need need to be pressurized to find any issue but yours seem to be pretty low hours.

Pressure testing your oil coolers and even bypassing it for a run with fresh oil would be my next move.
No I did not change the filter when I changed the oil the second time. I never pressurized stock manifolds but thinking its the same as a header?

oconnor marine 04-15-2019 05:31 PM
My opinion is the intake gaskets. While you are in there and its not obvious the gaskets are bad, look in the lifter valley for rusty cracks. Hopefully just the gaskets

drumerjb 04-15-2019 05:37 PM
Originally Posted by TYPHOON (Post 4682230)
I have a 2000 502 MPI that has water in the oil. The risers and manifolds look ok but are original with 153 hours on it. Compression test was good. I thought it was possibly just condensation from the winter. I changed the oil and ran the boat in the water for a hour to find the oil milky again. The motor was 100% winterized. Changed the oil again and re tested same result. Is the intake manifold a potential problem on this motor?
Seems pretty strange after coming out of storage. Cold storage I presume. How was it winterized & by who?

TomZ 04-15-2019 06:23 PM
Intake gaskets or intake itself. The intake is probably corroded at the passages. Common issue in salt water. My intakes have been repaired because of this with less hours.

TYPHOON 04-15-2019 06:43 PM
Originally Posted by drumerjb (Post 4682256)
Seems pretty strange after coming out of storage. Cold storage I presume. How was it winterized & by who?
We did at my shop.

sonicss42 04-15-2019 06:45 PM
Man I battled that last year and finally removed the heads after trying all the common stuff. Machine shop found that one of the exhaust ports near the valve was rusted through. These were “088” heads. Guy said that is very common. Mine was a ‘97 no salt motor. Good luck.

TYPHOON 04-15-2019 06:46 PM
What would people suggest in order of checking first to last please with what I have given as info.

TYPHOON 04-15-2019 06:49 PM
Originally Posted by sonicss42 (Post 4682270)
Man I battled that last year and finally removed the heads after trying all the common stuff. Machine shop found that one of the exhaust ports near the valve was rusted through. These were “088” heads. Guy said that is very common. Mine was a ‘97 no salt motor. Good luck.
How did you finally figure it out that it was in the heads

BUP 04-15-2019 07:56 PM
A smoke machine into the oil dipstick tube.

Prob intake manifold gaskets at the water ports are shot or the the water cooling port flange area at the heads are eroding away.

sonicss42 04-16-2019 07:19 AM
Originally Posted by TYPHOON (Post 4682272)
How did you finally figure it out that it was in the heads
I tried everything else, intake manifold and gaskets, replaced the CMI’s and everything already posted here or will be posted. Pulled heads and set them on the bench looking for possible bad valve guide or seat. Poured lacquer thinner in each ports and sure enough one would drain down. That when I asked machine shop to pressure test the head. He called me with his findings and bought new head from him. Had him set it up to match the others. Problem solved.

lightspeed 04-16-2019 08:27 AM
Randy did u pull the stat when u winterized??I have seen them crack inside the lifter galley,,,just a thought

TYPHOON 04-16-2019 01:50 PM
[QUOTE=lightspeed;4682361]Randy did u pull the stat when u winterized??I have seen them crack inside the lifter galley,,,just a thought[/QUOTE ] no I did not but I put a new one in last week


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