oil in lower unit,I have a leak HELP!!!

[v8power]

Ok, so in another post I am working on a cooling issue, now that ive put the lower drive back on, the drive oil is leaking into the lower case. In the area of the splined shift shaft. And is leaking out of the drain hole in the lower unit and the hub around the prop. The top of the input shaft has a o-ring on it and was wet with oil when I took the leg back off. O-ring looks good, no tears or cuts. Just wondering if its likely to be the o-ring or the one around the little oil passage. they both look good. Oh yea BTW its a 1980 merc 260 prealpha.

thanks in advance

 

[Bt Doctur]

Re: oil in lower unit,I have a leak HELP!!!

More likely the upper unit oil seal.Page 3A-10 in this link.Item 13
http://www.boatfix.com/merc/Servmanl/6/6A3R3.PDF

 

[v8power]

Re: oil in lower unit,I have a leak HELP!!!

One more question. This drive was serviced last may, and only saw about 20 hours of use, when I pulled the drive it was not leaking, now that ive put it back on it is leaking. Could I have done something wrong while reinstalling the drive?

 

[Bondo]

Re: oil in lower unit,I have a leak HELP!!!

when I pulled the drive it was not leaking, now that ive put it back on it is leaking. Could I have done something wrong while reinstalling the drive?

Ayuh,... Did you use New o-rings,+ gaskets,..??