Bike leaks grey oil

soflo_will
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soflo_will
Edited Date/Time 5/2/2017 12:44am
I wanted to know why my bike leaks grey oil from the clutch cover just yesterday i out brand new seals and bearings in the water pump cause it was leaking now its leaking from the clutch cover but its not a milky color its a grey one could anyone know what that means? I just got the full motor rebuilt its a 98 yz125 thanks.
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Mr Happy
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Mr Happy 5/1/2017 2:27am
5/1/2017 2:27am Edited Date/Time 5/1/2017 2:30am
Most 125s use aluminium plates. The grey colour oil is normal and just where they've worn. Nothing to worry about. It's leaking because you've disturbed something, not fitted it correctly or reused a gasket or seal.
soflo_will
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soflo_will 5/1/2017 4:24am
5/1/2017 4:24am
Mr Happy wrote:
Most 125s use aluminium plates. The grey colour oil is normal and just where they've worn. Nothing to worry about. It's leaking because you've disturbed something...
Most 125s use aluminium plates. The grey colour oil is normal and just where they've worn. Nothing to worry about. It's leaking because you've disturbed something, not fitted it correctly or reused a gasket or seal.
Oh ok you sure? My mechanic keep telling not to ride like that and also when i drained it coolant came out first then the oil second is that ok?
Slosh 112
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Slosh 112 5/1/2017 4:46am
5/1/2017 4:46am
If there is water in the transmission oil you've gotta strip it down and find the problem. The only point where oil is separated from coolant is at the water pump shaft seals. Make sure the shaft isn't worn, being an older model the seals could have worn grooves in the shaft and new ones won't seal.
Mr Happy
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Mr Happy 5/1/2017 5:01am
5/1/2017 5:01am
soflo_will wrote:
Oh ok you sure? My mechanic keep telling not to ride like that and also when i drained it coolant came out first then the oil...
Oh ok you sure? My mechanic keep telling not to ride like that and also when i drained it coolant came out first then the oil second is that ok?
I am sure about the oil colour. If coolant came out of the gearbox when you drained it then you've answered your own question and there is still a problem.

I've stood over fitters replacing these on centrifugal pumps many times and the problem if it leaks when it has been replaced is usually the ceramic ring. The ceramic ring for the mechanical seal needs to be perfectly square and isn't a job than can be done in situ, or inserted with a mallet and a socket. Also the same for the bearings although the chances of those needing to be replaced are slim. The shaft shouldn't be worn by the seal as it's hardened and the seal is only rubber. If you removed the cover to do the job and refitted it without changing the gasket then that's why that leaks, buy a new gasket when you do the job.

I recommend that you take it to a shop or you'll be forever chasing your own tail.

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soflo_will
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soflo_will 5/1/2017 5:10am
5/1/2017 5:10am
Slosh 112 wrote:
If there is water in the transmission oil you've gotta strip it down and find the problem. The only point where oil is separated from coolant...
If there is water in the transmission oil you've gotta strip it down and find the problem. The only point where oil is separated from coolant is at the water pump shaft seals. Make sure the shaft isn't worn, being an older model the seals could have worn grooves in the shaft and new ones won't seal.
Yeah but my mechanic put some water in the radiator to start the bike at first after that we put coolant in it he said the coolant will flush the water out is that correct or could be why?
soflo_will
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soflo_will 5/1/2017 5:30am
5/1/2017 5:30am
soflo_will wrote:
Oh ok you sure? My mechanic keep telling not to ride like that and also when i drained it coolant came out first then the oil...
Oh ok you sure? My mechanic keep telling not to ride like that and also when i drained it coolant came out first then the oil second is that ok?
Mr Happy wrote:
I am sure about the oil colour. If coolant came out of the gearbox when you drained it then you've answered your own question and there...
I am sure about the oil colour. If coolant came out of the gearbox when you drained it then you've answered your own question and there is still a problem.

I've stood over fitters replacing these on centrifugal pumps many times and the problem if it leaks when it has been replaced is usually the ceramic ring. The ceramic ring for the mechanical seal needs to be perfectly square and isn't a job than can be done in situ, or inserted with a mallet and a socket. Also the same for the bearings although the chances of those needing to be replaced are slim. The shaft shouldn't be worn by the seal as it's hardened and the seal is only rubber. If you removed the cover to do the job and refitted it without changing the gasket then that's why that leaks, buy a new gasket when you do the job.

I recommend that you take it to a shop or you'll be forever chasing your own tail.


Heres a pic of what i drained first coolant then the oil came out of the same bolt
Mr Happy
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Mr Happy 5/1/2017 6:29am
5/1/2017 6:29am
You still have a leaking water pump. Just because you've replaced the parts doesn't mean you've done the job correctly. I recommend that you take it to a shop.
Slosh 112
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Slosh 112 5/1/2017 12:35pm
5/1/2017 12:35pm Edited Date/Time 5/1/2017 12:36pm
Mr Happy wrote:
I am sure about the oil colour. If coolant came out of the gearbox when you drained it then you've answered your own question and there...
I am sure about the oil colour. If coolant came out of the gearbox when you drained it then you've answered your own question and there is still a problem.

I've stood over fitters replacing these on centrifugal pumps many times and the problem if it leaks when it has been replaced is usually the ceramic ring. The ceramic ring for the mechanical seal needs to be perfectly square and isn't a job than can be done in situ, or inserted with a mallet and a socket. Also the same for the bearings although the chances of those needing to be replaced are slim. The shaft shouldn't be worn by the seal as it's hardened and the seal is only rubber. If you removed the cover to do the job and refitted it without changing the gasket then that's why that leaks, buy a new gasket when you do the job.

I recommend that you take it to a shop or you'll be forever chasing your own tail.
It won't be hardened it will be just a low grade stainless, and yes the shaft could still be worn. Just because one is steel and one is rubber doesn't mean the softer one will wear before other, I've seen numerous instances where the shaft has a groove worn into it by a rubber lip seal, stub axles, water pump shafts, differential axles etc. Next time you change your front or rear wheel look at the aluminium spacers that go inside your hub seals. Unless the bike is brand new or you replace the spacers regularlyI almost garuntee there will be a groove worn in it.
soflo_will
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soflo_will 5/1/2017 1:50pm
5/1/2017 1:50pm
Mr Happy wrote:
I am sure about the oil colour. If coolant came out of the gearbox when you drained it then you've answered your own question and there...
I am sure about the oil colour. If coolant came out of the gearbox when you drained it then you've answered your own question and there is still a problem.

I've stood over fitters replacing these on centrifugal pumps many times and the problem if it leaks when it has been replaced is usually the ceramic ring. The ceramic ring for the mechanical seal needs to be perfectly square and isn't a job than can be done in situ, or inserted with a mallet and a socket. Also the same for the bearings although the chances of those needing to be replaced are slim. The shaft shouldn't be worn by the seal as it's hardened and the seal is only rubber. If you removed the cover to do the job and refitted it without changing the gasket then that's why that leaks, buy a new gasket when you do the job.

I recommend that you take it to a shop or you'll be forever chasing your own tail.
Slosh 112 wrote:
It won't be hardened it will be just a low grade stainless, and yes the shaft could still be worn. Just because one is steel and...
It won't be hardened it will be just a low grade stainless, and yes the shaft could still be worn. Just because one is steel and one is rubber doesn't mean the softer one will wear before other, I've seen numerous instances where the shaft has a groove worn into it by a rubber lip seal, stub axles, water pump shafts, differential axles etc. Next time you change your front or rear wheel look at the aluminium spacers that go inside your hub seals. Unless the bike is brand new or you replace the spacers regularlyI almost garuntee there will be a groove worn in it.
So are you thinking its a groove that is worn on the pump shaft? That is cause a leak to the bottom of the clutch cover??
Slosh 112
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Slosh 112 5/2/2017 12:01am
5/2/2017 12:01am
soflo_will wrote:
So are you thinking its a groove that is worn on the pump shaft? That is cause a leak to the bottom of the clutch cover??
Going to have to tear it apart and inspect. It could be what we have stated above but a tear down always confirms the problem.

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