Speedometer cable O-rings and oil seal install question

[miker]

I'm looking for some advice on the proper way to install the speedometer cable 0rings and oil seal. Part number 78 below is the one which I'm really not sure about.

According to the parts breakout on SOR, it looks like there are 3 parts to seal the oil from coming out of the tcase. These are 78, 79 and 80.

Part 79 is the larger o-ring that goes around the speedo driven gear housing (part 2), seems simple enough.

Part 80, I assume is the felt dounut that you put on the end of the speedo cable before attaching the cable to the speedo driven gear housing (part 2).

Part 78, "O-ring", according to the SOR site.
Where exactly is this o-ring installed? Anyone know?

Here are the parts from the SOR rebuild kit.
I assume one of these small 0-rings is for the speedo cable and one if for the hi/lo shift rail:

 

[miker]

BTW, I've installed parts 80 and 79 but there is still a small leak that looks to be coming from the speedo cable at the t-case. I didn't realize part 78 was for the speedo as well and didn't install it. I don't recall the driven gear shaft protruding out enough to place an o-ring on it, but I may take it apart tonight and see if I can figure out where this o-ring it is supposed to go.

 

[spotcruiser]

I believe 78 goes inside the bore of part #2.

 

[miker]

78 goes inside the bore of part #2.

Thanks spotcruiser. From the SOR diagram, I am assuming it goes towards the outside of #2, or near where the cable attaches? I don't recall a grove in part #1, or an obvious place for the o-ring.

 

[Fast Eddy]

It's about in the middle of #2. You need a dental pick to get the old one out.

A couple pics and a description by @Poser in this thread: Transfer leak at speedo cable

 

[spotcruiser]

It has been a while, but I believe there is a groove in the bore of #2 for that O-ring. As I recall, it's a little tricky to get the old one out.

 

[miker]

Thanks for the info. Didnt have time tonite but will get to it by this weekend. Only thing keeping me from driving the 45.

 

[miker]

Was able to extract the o-ring and get a new one installed tonight.