Oil in water xciting 500

[xsel777]

I have found oil in the water in the filler pipe.
Very thick.
About 3cm length filled with oil.

Over a two week period this build up.
A week later I checked again.
2cm length of oil in that pipe.
Oil rises, so that is why it is at the top.

Only two places that I know where it can come from.
Mechanical seal, but I see no leaks on the outside.
So that probably means it is ok.
You have any other views on this position.?

The most likely is the head gasket or a cracked head.

The gasket has been changed a few times (while replacing exhaust cam)

The head had been skimmed once.

What are the chances of it just being the gasket.?
And not worse.

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[xsel777]

I was talking to someone who seems knowledgable regarding mechanical things, and  the oil cooler came up as a possible suspect.
Why?
Because I must continually refill oil, 250ml at a time, and exhaust its not wet. And this oil in water symptom described in this thread. Is this a credible possibility?

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[CROSSBOLT]

Yes. I did not know this bike had an oil cooler. Where is it?

[xsel777]

When sitting on the scoot, it is on the lower left front of the engine.
The  oil and water pump are on the right hand side of the engine

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[xsel777]

What I find each week, when I open up the filler cap.
I just take the filler pipe off, blow it out and refit. Once new distilled water is in, and I run the motor, the now green water gurgles away just fine.

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[CROSSBOLT]

Oh, that picture is awful! Good picture, ugly subject. It is this way every week? That's where your oil is going if it is that way every week!

[xsel777]

I am going to get a used oil cooler and see if the situation changes. It is the cheapest and easiest option, and also it is one thing that had never been changed in all the times it has been in the workshop.


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[xsel777]

Update : the scoot is at the mechanic after I did a radiator flush and cleaned the pipes, and now the motor is on the floor and the head is off.
According to the mackie, all looks ok mostly, just a little bit black, from fuel injection he says. Nothing wrong with the exhaust cam, so that concern is sorted.
The new head gasket is black, but the old one is gold.
The head has been declared straight. No leak found there.
So, I told them to leak test the oil cooler, because there can only be one other spot where it could leak oil into the water , the mechanical seal at the water pump.

They don't want to  take off the barrel, as the refitting of the rings is considered risky, possibly resulting in smoke.
Since there is a gasket there too, perhaps I should push for checking for a oil leak there?
This is my only question.
But feel free to comment on any thing in this post.

I have supplied replacement coolant pipes, and await a report of where the leak is coming from. Much Head scratching!

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[xsel777]

Well, that was fast. The workshop said they checked the head and barrel and lightly sanded the head and the motor is now back in the frame.

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[xsel777]

Ok, I have had the scoot for the afternoon, and it drives ok. They did not change one coolant pipe, top radiator. It is to much hassle to go back and moan. I will sort it out. Tappets are noisier. They can reset that when the head is tightened at 1000km(the first time I shall be doing that).
I was given instructions to watch for a reaccurance of the issue, since there was not conclusive evidence that the head gasket  was the actual weak point. So, the oil cooler is still possibly the culprit.
Luckily, the Kymco scrapyard, has a xc500 with an oil cooler, so, there is hope yet.
Never give up!

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[Stig / Major Tom]

Why do I think of Moby Dick when I see another post about this scooter.
Also, Job comes to mind, for some reason.

🐳⛪
Stig

[CROSSBOLT]

Ya know, Stig, that is very perceptive! He has to have more patience than me! I woulda tipped over a windmill by now or at least hurt somebody or got hurt in the process!

[xsel777]

Yep, I am getting all and sundry advising the same, but this is the issue, no cash for a big purchase, each large scooter, like burgman, tmax, sym, are through the roof expensive, and even more expensive to service. Eventually it is expected that all the issues will be sorted, and I can relax regarding the reliability of this scoot.
I am quite happy to have it back, as that kymco super 8 is so slow I thought I could walk faster.
On the other hand, I am out of funds so I am riding slower and slower, in the hope it will not break again.
A thing that has improved is the temp is behaving like it should now, and not temperamental like it was before.
Onwards, we go.

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[hypophthalmus]

I don't think it's the sort of thing where driving it faster is going to make anything worse. Either you fixed the problem and you can drive it as hard as you like. Or there's still a leak somewhere, and driving it harder isn't going to make anything worse.

[Stig / Major Tom]

Are used Burgman 400's expensive down there?
Burgmans don't have much resale value here in the States....certainly not when compared to their MSRP OTD price!
Other than valve adjustments, which few do, they are easy to service....and pretty robust by reputation
In any event ....best of luck with your current ride!
Stig