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  #1   IP: 165.225.38.195
Old 11-08-2021, 03:48 PM
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Milky Oil

I have been reading and troubleshooting. Here is what I have done so far:
1. Changed the oil 5x. It now looks clear.
2. Pressure tested the manifold. It passed.
3. Pressure tested the block. It passed.
4. Removed the manifold and valve cover. Everything looks good. The valve cover gasket came apart on removal, so it's possible that was a source of infiltration.
5. Examined externally the water pump. I don't see any evidence of leaking seals.

Upon reflection, I wonder if an episode this summer where I sprayed water around the engine compartment (it was not intentional, but I don't want to talk about it ) caused this problem. I had milky oil 2 years ago, but that cleared up after changing the oil 3x. Any ideas?

Side note: should I use gasket sealant when putting the new gasket on the valve cover?
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Old 11-08-2021, 05:26 PM
Dave Neptune Dave Neptune is online now
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Yes use a good Permatex Aviation Grade or Number 2 grade.

The water pump can leak into the oil via the rear seal. If the water getting in has been consistent it's a likely suspect. Intermittent could be from the hush hush spraying.

Dave Neptune
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  #3   IP: 70.67.6.75
Old 11-09-2021, 06:28 PM
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Are you raw water cooled?
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Old 11-09-2021, 08:52 PM
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Are you raw water cooled?
Yes, I am.
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Old 11-09-2021, 09:32 PM
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Water in the oil does not have to be from an engine issue. The only time I had water in the oil was a result of large wakes hitting my stern when I was stuck on a sandbar. If you do not have a plate over your exhaust through hull, then a wave or wake could have pushed water up through the exhaust and into your engine. Also extended cranking with the cooling water through hull open can fill your water lift muffler (if you have one) and also push water into the crankcase through an open valve.
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Old 11-10-2021, 03:30 PM
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Lots of info regarding this topic on the forum. I'm sure others will chime in and help figure out what's causing it. What about the possibility of over cranking with the sea cock open? Any restrictions in the exhaust?
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Old 11-12-2021, 07:16 AM
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I have been reading the various threads on this issue. I'm hoping that this was the result of an event, such as the water spray in the engine compartment or infiltration through the exhaust (no plate over my tail pipe). I was able to rule out cracks in the manifold or the block, plus engine compression test shows great on all 4 cylinders, so that's good. The boat's on the hard now, so it will have to wait until next year to know for sure. It was definitely not extended cranking. The one bummer is that, while putting the valve cover plate back on, I broke a bolt by overtightening. Now I have another problem to solve.
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Old 11-12-2021, 10:20 AM
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Have you checked the head?
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Old 11-15-2021, 11:58 AM
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Quote:
Originally Posted by prstack7 View Post
I have been reading the various threads on this issue. I'm hoping that this was the result of an event, such as the water spray in the engine compartment or infiltration through the exhaust (no plate over my tail pipe). I was able to rule out cracks in the manifold or the block, plus engine compression test shows great on all 4 cylinders, so that's good. The boat's on the hard now, so it will have to wait until next year to know for sure. It was definitely not extended cranking. The one bummer is that, while putting the valve cover plate back on, I broke a bolt by overtightening. Now I have another problem to solve.
Once you get the broken bolt extracted, this is a great time to convert to studs!
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Old 11-21-2021, 09:48 AM
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Have you checked the head?
Yes, I did a compression test and all 4 cylinders were around 115.
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Old 11-21-2021, 09:49 AM
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Quote:
Originally Posted by sastanley View Post
Once you get the broken bolt extracted, this is a great time to convert to studs!
That's a good point. I hadn't thought of that.
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