speedometer cable O-rings

[darom]

I can't for the life of me find any info on the O-rings inside the speedometer cable at the tranny cog. I searched in vain here and in my pdf service manual files.

 

I swapped my 4-speed with a 5-speed and fished out 2 chewed up o-rings. There was always a tranny fluid leak.

 

How many o-rings do I need there? What size?

 

Any tips are appreciated.

 

Thanks,

Den

'76 280z

[cygnusx1]

There is an o-ring on the outside of the tranny cog and an oil seal inside the pinion body. You can get both of them through Nissan or MSA. I use a drill bit to get the old seal out of the pinion body. Turn a sharp bit, by hand, into the seal and yank it out. Use a bit that is a bit smaller than the ID of the pinion body.

[darom]

cygnusx1, thanks for the response. It seems the leak is from within the speedometer cable itself, not the outside of the cog.

 

Is there an o-ring on the speedo gear shaft? Here is the picture - where the arrow is pointed I had two stacked chewed up o-rings. Do I need anything there? It doesn't seem logical since the speedo cable moves inside. I might be wrong.

 

Thanks,

Den

[cygnusx1]

Inside the lower end of your pinion housing, there should be an oil seal about 1/2" inside.. That will keep the oil from wicking into the speedo cable. One o-ring and one oil seal is all there should be in the whole assembly.

 

One of these

http://www.thezstore.com/page/TZS/PROD/SDC02E/20-1552

 

and one of these

http://www.thezstore.com/page/TZS/PROD/SDC02E/20-1550

[darom]

Great, thanks - that's exactly what I was looking for! I guess the PO just added the second o-ring to stop that annoying leak, lol.