Creamy Coloured Oil

[Youngie]

greetings all

back with another issue.. This time its relating to the oil.

Just let the engine run through for a while and noticed the oil in level window is looking milky. I had changed the oil prior to a MOT, since the clutch plates got replaced. So not sure as to why the oil is all of a sudden running a strange colour.

I'm in two minds as to whether this is something very terminal or just cold causing a bit of water.. BUT I'm a tad concerned in case its a gasket or something.

I am going to see if the rad water level changes when I run it again, in case its water running into head gasket (if that's right thing to do) and then do another oil change.

I don't really want to take it on a run, just in case it causes further damaged (problems). since this bloody bike is starting to be a bit of a basket case  ...

any guidance on where I should be looking would be greatly appreciated.

cheers all

ps - maybe I should flog it and save the trouble 

[SeaR1ck]

That's usually the sign of coolant and oil mixing from like a leaking water pump seal  typically.

[Martin77]

Yup, probably the water pump seal, found inside the clutch cover. Not a massive job to fix...bit of a pig sometimes to get the old one out sometimes.

[Youngie]

I failed to mention it a 4DL. Sorry

So clutch cover off and check water seal or at least replace anyway while in.

cheers peeps, i'll give it a whirl

thanks

[Youngie]

Confussing..

I take it im just changing the seal on water pump. Cos i have no idea where a seal would behind any clutch cover.. 

I know water pump is just upper side of engine. Or should i being looking elsewhere


Or am i just being thick..

[SeaR1ck]

It's behind the water pump cover but you have to pull the whole clutch cover off to remove it and install the new one. You see where it is on the cover in this picture.

[Youngie]

Anyone know what these are like off flea bay..

https://www.ebay.co.uk/itm/362683035271

Or any other places worth getting seals from 👍🏻

[SeaR1ck]

Gaskets look decent almost look like they are using athena gaskets in the picture. That seal is a pretty common seal it's used in the banshee 350 4 wheelers i believe it's the same as the rd/rz350 lc used in my tzm 150 the tzr 125's etc.

That's not a bad price for that whole kit cause you'll need all of those bits. Google search the part number. Ebay search the part number it's interesting what you might find.

[Youngie]

Ill be testing bike later tomorrow...

Im hoping replacing the water seal does the trick.. And yep it was a pain to get out..

All done now though.. If its still milkly after this, ill be lost..

[Youngie]

Doesn't look like the water pump seal was the issue. Replaced and looks like i still have a milky coloured oil in view glass..

I dont really want to take for a run round block incase it causes further issues.

Any ideas where / what i should look at next 

[Steveog]

Youngie. This must be frustrating as Hell. I have no experience with a 125, but can give you advice that worked for my 3xv suffering a similar malady.

The water pump seal is still the most logical source of water getting into the tranny oil. That said, when you pull the clutch cover and water pump shaft, you should see milky oil draining from the seal.

So, what's wrong? The replacement seal needs to be a Yamaha OE part. On my 3xv there is an extra lip on the factory seal compared to the pattern seal.

If the seal doesn't show water in the oil then you'll need to investigate the other spots where water is sealed against oil.

If it's a base or head gasket, you should have seen lots of whitish smoke when the bike was running.

Careful inspection of the cases for cracks near the water channels would be the next thing to check.

Yes. A pain in the balls, but start with your pattern water pump seal and stock rotor. If the rotor shaft is bent it could be the cause of your problem.

For your sake, I'm hoping Martin77 is reading this and can give you his knowledge on this specific bike.

Good luck.

Steve

[Martin77]

Well, there's only one real place where water can get into the gearbox... at the water pump, or around the cover gasket.

Sometimes the shaft of the pump impeller can get worn/corroded allowing water to pass, so it may be worth checking that. Was it a new cover gasket?

Also, remember the old oil would have coated everything in the gearbox with the emulsified white stuff, so when you put the new oil in, it'll be tainted somewhat. Rinsing the old stuff out can be a nightmare when it gets really bad! In the past I have filled with any oil to hand (that's clean) run it a short while, then drained to help rinse it all out.

I had soem 2stroke oil go milky with water once, and as it was brand new I wanted to use it once I'd sorted the problem, so I put it on the cooker and cooked the water out of it gently...

[Youngie]

Wow.. Boiling oil is a whole new ball game to me..

I checked water pump shaft and all was well.. Seal replacement looks good and if its a whole / gap, it must be a pin prick..

Ill run engine and drain, put some fresh thru again and see if it resolves issue..

Then its just a case of cleaning carbs and jets to give it a run on road..

I do have various fairing pieces to sort, but all need a good clean up and lick of paint.. Although i considering vinyl wrap.. Anyone tried that..

[2stroke]

Doesn't look like the water pump seal was the issue. Replaced and looks like i still have a milky coloured oil in view glass..

I dont really want to take for a run round block incase it causes further issues.

Any ideas where / what i should look at next 

Hello Youngie,

have you checked gearbox/clutch oil level?

Oil can become emulsified in many ways, both with water and with combustion chamber gases.

If mixed with water it tends to become whitish, but the oil level in the clutch cover increases, while the coolant in the radiator / expansion vase-tank decreases, the main suspect is the water pump oil seal. Note that the impeller shaft may also be worn, and the oil seal, although new, may not hold well. If you are interested, I have seen a revision kit for the water pump consisting of gaskets, oil seals and everything you need (write me a PM for the link).

If the oil is whitish, but the level decreases in the clutch cover, especially if you notice an accentuated smoke at the exhaust, it could be the right oil seal of the crankshaft. From there the gases and 2 stroke oil come out from the crankshaft and combustion chamber.

If you are in doubt, and you  have to open the clutch cover, it is convenient to  buy both the oil seals, related gaskets and proceed with the change.

If you have any questions, please ask, I will be glad to help you. 

[Youngie]

Cool.. Ill give you a PM buddy

Again thanks all for the advice, its very much appreciated