Cf moto water leak

[Lkhangee]

Originally Posted by Engineern6719

I agree.Maybe wear on the drive shaft or a damaged seal during reassembling the pump.The pressure in the coolant system when heated would be high and wouldn't take much to have a small leak.Would it be possible to remove the pump and carry out a leak check by applying compressed air on the pump inlet and blocking the outlet and putting the pump in water to see any leaks.

Hii have a Chinese replica cg200 water cooled. Engine model 163ML.
I am troubleshooting oil mixing with water head gasket was blow slightly I resurfaced the faces using 220,300,400,800 grit papers. Now I need to see if the oil pump assembly is leaking.

Can this test be done on that pump too? I think it will always fail as water molecules are bigger then air and that seals won't stay air pressure. But I don't know.