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Oil still in the water.
#1
I managed to secure a water pump, and 2 weeks later, there is still oil  in the water. I did notice that the water temp needle dropped from just over half  to just under half, the first time ever.
The only thing I have not changed is the oil cooler, but I did bypass it during a test run  and did not see any oil in the water channels. So, I am stumped. The  head gasket has been changed twice. No mechanic noticed a crack. There is another gasket below the new barrel, that did not get changed, so I am not sure if there is an internal leak there.
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Burning up the Tarmac
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#2
Quote:....but I did bypass it during a test run and did not see any oil in the water channels ...
How long did you test ride with the oil cooler bypassed? Did the engine get up to operating temp? If so, it sounds like the oil cooler water channel may have a hairline rupture somewhere, that only fails after a certain pressure and heat. By passing the oil cooler for a short testing period, should not do any damage to a standard motor. Just keep an eye on the oil and water level / temp.
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#3
I agree, it doesn't sound like an actual crack in the engine, it sounds more like a very small crack in the radiator somewhere
Matthew Olivier (aka Mat1998)
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#4
Wish me luck.
This weekend is D-day.
I am fitting the oil cooler I got from the used spares dept at the previous Kymco dealer.
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#5
Well, oil cooler fitted, amidst much ?. I also put some loctite radiator cement into the cooling system , and noted that 1.5l water was missing, so, now, most likely a head gasket problem as well.I am very grateful that there is no water in the oil.. I shall drive around and see the results of this work.
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Burning up the Tarmac
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#6
Your oil still in water problem all sorted now?
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#7
I don't think so.
I have to watch the rubber hoses closely now, as they have expanded, and are soft, and one split twice in one day.
But,what I can see happening now, is that the expansion track is getting filled, while driving, and then I notice a problem when the expansion tank overflows.
The colour is milky green.
I find I am putting 250ml in to topup at the radiator cap.
Also noted, some vacuum suction, when taking the cap off.
So, not quite sure what is happening.
Or rather, why I see these symptoms now.
Did the oil cooler fix the oil issue?
Or was it combined with the loctite radiator cement?
Why continuous excess fluid in expansion tank?
Is the cap too low pressure (1.1)? Temp stays normal.
Why a vacuum suction when removing the cap?

So many questions... ?.
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Burning up the Tarmac
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#8
Have you asked advice from one of the radiator firms in your area? They have the tools do a cooling system pressure, radiator cap pressure and cooling system temperature testing. These tests can help eliminate things like, faulty thermostat, faulty radiator cap, blocked radiator, etc.
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#9
I have not been to a radiator place.
But I did see big bubbles coming up at the filler.

I replaced the rad cap, from 1.1 to 1.3,and don't hear bubbling in the coolant hoses now.

In the meanwhile I ordered a head gasket from yamaha.
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Burning up the Tarmac
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#10
After a high speed run, I still hear boiling water in coolant system. Nothing really spilling into expansion tank though.
I am going to check radiator level again this morning.
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Burning up the Tarmac
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