Water intrusion drive , new seals ??????

[Grandpaw]

2000
OX 66 ]
250 hp
2 stroke
SX 250TXRY

Noticed oil slick prop area at dock , engine not running
dropped gear oil , milky
changed 2 prop shaft seals
seal under impeller
shift shaft seal
new gaskets on vent & drain screws
pumped in 12 psi , held all night
Since it held all night added fresh gear oil ,
installed drive , testing in barrel , fresh water running into barrel
noticed oil slick ,
dropped gear oil and a little milky
Removed prop , sprayed soapy water on seals , 12 psi , hand turning drive , no bubbles
Did not remove carrier too change O RING ,

I see a mechanic added a O RING between the two lower seals ,


f I held pressure why is oil coming out , water in ?????
THANK YOU

[ausnoelm]

Maybe it’s as simple as water was still in case when you changed the oil, change again, but flush gear case before adding new oil.