Speedo drive oil leak

[tige]

Last year i found an oil leak was coming from my speedo drive, so i took it out to inspect, there was an o ring fitted that seemed worn, after trying to get a replacement with no luck, i replaced it with a metric one i had from my collection, it seemed to cure the problem, until now, ive searched again for the o ring with no luck, even dragonfly and burton bikes bits do not show one on the engine blow ups, So if that's right and it was something the previous owner fitted, what actually stops the oil from coming out, the drawings show 2 washers.10365-3375 & 10265-3395 do either of these stop the oil getting past the drive, the funny thing is there is a cut out on the shaft that makes it look like it was made for an o ring.
My bike is a A65 star.

[Mike Farmer]

 

According to drags 68-3153

Mike

[JulianS]

65 3375 is a steel thrust washer - red arrow on photo.

65 3395 is a square section rubber seal which stops leaks between the bush and the case. Yellow arrow on photo.

Second photo shows the assembly from a slightly later version of the parts book. Note 65 3395 is replaced by 68 0538 which is an O ring.

Also shows O ring on the drive shaft. 2 different part numbers shown, 42 3039 is a very thin and flimsy one. 68 3153, more substantial, shown as fitted 1964 on.

[tige]

Thanks for the pics , will now get back to burton bike parts with the pic, see what she has. once again many thaks.