Likely cause for water in oil. ST2 - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 6 (permalink) Old Apr 14th, 2019, 7:05 am Thread Starter
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Likely cause for water in oil. ST2

I have found traces of water in the oil in our ST-2.
What are the likely causes for this?
1. Head gasket?
2. Other fault?

Thanks.

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post #2 of 6 (permalink) Old Apr 14th, 2019, 7:09 am
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there is no head gasket. i'd start with the water pump seal, it's a spring loaded ceramic seal.
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post #3 of 6 (permalink) Old Apr 14th, 2019, 11:13 am
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For "traces" of water after a long winter hibernation, I would do nothing for a while. Thanks to combustion products blowing by the rings, there's always some water in the crankcase and thus the oil. Significant loss of coolant or evidence of oil in the coolant would require immediate investigation. This, as well as milky whitish oil seen in the level window, I've never done anything about and (so far) always disappears with warmer weather and frequent riding.
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post #4 of 6 (permalink) Old Apr 14th, 2019, 12:59 pm Thread Starter
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Thank´s for the answers.
Reason for my concern is that I have 4 Ducatis in the same garage, 3 aircooled and then this ST2 and only the ST2 had greyish streaks in the oil when changed.

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post #5 of 6 (permalink) Old Apr 14th, 2019, 6:06 pm
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Quote:
Originally Posted by belter View Post
there is no head gasket. i'd start with the water pump seal, it's a spring loaded ceramic seal.
This^^^
Keep an eye on your oil level. Water is heavier than oil and will sink to the bottom of the oil pan raising the oil level visible in the sight glass. If you indeed have an issue you'll see it at a higher level than you have now or had two days ago.

If you don't have an unexplainable rise in oil level then you likely just have a bit of moisture in the crank case. That needs to be burned off by an unbridled, long hard ride through the twistiest stuff you have in your neck of the woods.
.....sean
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post #6 of 6 (permalink) Old Apr 16th, 2019, 6:43 am
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The oil breather that goes to the box under the seat can be a culprit. Water condenses up there and runs back when you finish a ride. Make sure the tube is clear, and go for a good ride soon a warm day.

David
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