Gearbox plunger orientation question | The Z Club of Great Britain
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Gearbox plunger orientation question

Discussion in 'S30 (240Z,260Z,280Z) Drivetrain' started by Paul_S, May 23, 2020 at 5:12 PM.

  1. Paul_S

    Paul_S
    Z Club Member

    I'm sorting out a 5 speed gearbox and I've bought a replacement plunger because the old one was heavily scored. It's the part shown here:

    Reverse Plunger Diagram.png

    Here is the new and old one side by side:

    Reverse Plunger.jpg

    As you can see the new one has a pinhole in it (presumably to allow oil flow?) whereas the old one didn't.

    Onto my question... should the hole the at the top or the bottom?

    If the hole is to allow oil flow, should it be at the top to allow oil in or below to allow oil to drain?
     
  2. jonbills

    jonbills
    ZClub Administrator
    Staff Member Moderator

    either way up can't be worse that the old one.
     
    Paul_S likes this.
  3. Paul_S

    Paul_S
    Z Club Member

    That did occur to me!
     
  4. Paul_S

    Paul_S
    Z Club Member

    I chose to put the hole at the top. I have a 50% chance of that being right!
     
    Pondo likes this.
  5. jonbills

    jonbills
    ZClub Administrator
    Staff Member Moderator

    you'll probably find our if you got it wrong in about 100,000 miles :)
     
    Paul_S likes this.

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