Datsun 240Z – Leaking Speedometer Pinion

Datsun 240Z – Leaking Speedometer Pinion

My Z was leaking transmission oil from the part of the transmission where the speedometer cable connects.  I thought it was just the speedometer cable connection was loose.  This is a simple fix (replacing an O-ring and oil seal) that you can get done quickly.  Rarely has so little effort produced so much joy!

The Parts

Motorsport AutoBlack DragonNissan

The Process

This is explained so beautifully Greg on, that here is no reason to duplicate it here.

Some notes

  • You do not need to drain the transmission before doing this (though some oil may leak out).
  • From esprist on “try to save the roll pin that holds the cog in place. That one is metric and very very hard to get here in U. S. I tried every hardware store around here in L.A. No luck. So I had it shipped from Japan. (Very cheap, but the time while I was waiting just for that…)”
  • Put a little oil on everything as you are putting it back together.  Put some oil or grease on the 0-ring before you slide the assembly back into the transmission.
  • Take care during insertion that you don’t pinch or damage the O-ring.

See also:

Replace Speedometer Cable