The gear box and the engine are separated by a clutch and flywheel in the manual and a torque converter in an automatic so I am little puzzled as to how water (presumably engine coolant) got into the gear box. That aside, the only remedy is to drain the gear box and replenish with new oil.
On the other hand do you mean that water is the engine oil if so this will need to be drained and renewed. The only source of water contamination in the engine oil, other than the inadvertent adding of water via the oil filler cap, would be a cylinder head gasket failure allowing water to leak from the internal passages into the oil ways. If that is the case the gasket will need replacing.
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I FOUND THE PROBLEM AND SOLUTION.
it was aproblem with the radiator, fixed successfully, no problem now.
it's the deffective radiator.
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