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2012 4Rt Transmission Oil Leak In To Engine Oil


menglovekai
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Today. I change the engine oil and transmission oil together .
I notice there is very little amount of transmission oil came out . may be 200 cc.

But the engine oil came out  800cc. 

So i fill new oil in and ride for 1 hour . i found engine oil level increase about 100cc per 1 hour of ride.


Transmission side breather hose looks ok ,No oil came out the hose looks clean.

Is this the Crank seal problem?

 

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  • 2 weeks later...

Update.  
Oil seal 's rubber deteriorate. No groove on the metal sleeve.

I don't know how this happen but this bike parked for 2 years before i bought it. only 20 hours of use.

after change ,I let the engine run at idle for 10 minute. engine oil level still the same :D 





 

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Edited by menglovekai
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  • 3 weeks later...
 
  • 2 months later...

3 months  after crank seal changed.
I notice the engine oil level is rising again.  and the transmission oil is decrease. 

the engine looks clean ,no oil leak

Is it possible that the engine oil pump's oil seal is defect ?   

 

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On 4/6/2017 at 7:42 AM, menglovekai said:

... Is it possible that the engine oil pump's oil seal is defect?   

 

May be possible, but I think it's unlikely because:

1) Pressure should be higher in the oil pump, which would push engine oil into the clutch / primary drive case rather than the opposite, and,

2) The oil pump seal is fairly high, above the transmission oil level (unless transmission is overfilled). There could be splash that gets to that seal, but it's also recessed and away from oil slung by the primary gears.

Back to the first point, the pressure should be higher in the oil pump than the clutch / primary drive case. But if the transmission breather hose is blocked or pinched, pressure could buildup in the transmission / primary drive. That would increase potential for transmission oil migration to engine oil at the various seals or at the center-case gasket.

Sorry... probably not much help.

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