oil in the coolant? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 10-14-2019, 10:10 PM Thread Starter
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oil in the coolant?

So I was out riding today, everything was great, and suddenly theres coolant shooting everywhere. I'm guessing a blown hose, tho I cant tell where til I take the tank off. But it also appears to have oil in the coolant. Is there any possible reason for this other than the obvious bad head gasket? I've never taken the covers off, wouldn't really mind the project, but I'm wondering if theres another possible cause that I should investigate first. Any suggestions?
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post #2 of 7 (permalink) Old 10-14-2019, 11:50 PM
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Was it fully warmed up when you looked at the oil? This engine is somewhat unique in that the oil will look milky in the first few minutes of running due to "air entrainment", air whipped into the cold oil. First engine I've ever seen that does this.

No doubt many have been junked or the engine torn down for a head gasket because of this.

Could also be the water pump seal if it's not a head gasket.

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post #3 of 7 (permalink) Old 10-15-2019, 12:02 PM
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tank removal is easy. remove seat, remove 2 neck covers. 1 bolt each side under neck covers, on bolt at rear of tank.

remember to be careful when removing the fuel lines and vent line(s) so you get them on in proper position. Also there is a connector on bottom of tank for sending unit

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post #4 of 7 (permalink) Old 10-16-2019, 02:16 AM Thread Starter
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The problem isn't fear of coolant in the oil, although that may be a thing that's happening. But when a coolant hose blew, the coolant that shot out everywhere was contaminated with oil. It would make sense that the oil is full of coolant as well, but the oil isn't what was pooling on the asphalt.

And as far as removing the tank goes, I can manage that. I've had it off before, and I'm sure that if it was just a hose, it would be a ten minute project to replace it. But the deeper concern is what might have caused it to blow, and why it seemed like the coolant was full of oil.

Water pump seal is a good thought, that would explain the spraying coolant for sure, but not so much the contamination. But maybe the two aren't related?

At the moment I'm working too much to have any daylight hours to put into it. But I'll report back once I get a chance to look at it and see what I can figure out
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post #5 of 7 (permalink) Old 10-16-2019, 04:09 PM
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the water pump has coolant on one side of the seal (of course it does), and on the opposite end of the impeller shaft is engine oil. very possible for bad seal(s) (there may be 2?) to allow them to co-mingle

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post #6 of 7 (permalink) Old 10-17-2019, 08:50 AM
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There is a "sealed" bearing in between the engine and water pump. If the water pump water seal leaks, and it seems designed to weep a little, it leaks into the cavity with the bearing that has a weep hole under the engine. That is one potential route to mix the two fluids but there should have been some indication of a leak from the weep hole first.

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post #7 of 7 (permalink) Old 12-09-2019, 10:08 AM
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I had this issue, replaced the oil seal and mechanical seal as well but it was already too late to use the sealed bearing again. I had to replace it as well. But my entire coolant system was contaminated with oil.
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