Got as used motor,the lower was leaking.I replaced both prop shaft seals and the bearing housing o-ring.I noticed today the o-ring is leaking again.The gearhousing nut thats plastic?? Nylon? does it need torqued on? I didn't use any sealer on the o-ring when I did the new seals and o-ring last fall. I have it ready to get the bearing carrier out,Any suggestions would very helpful.and torque spec if it needs torqued. THANK YOU!!