Blinker Mechanism Repair

My blinker mechanism was giving me a little bit of grief. For left turns, I had no problem. For right turns, however, the blinker wouldn’t come on. I need to give the blinker lever a good, firm push upward to get the blinker to come on. The actual switch itself was fine, but something in the mechanism wasn’t ‘going all the way’ and switching the switch.

I diagnosed it to a little, nylon slider that loosely connects the blinker lever to the blinker switch. This little nylon gizmo allows conversion of the circular movement of the blinker lever into the ‘straight line’ movement of the blinker switch.

After 50 years, it appears the little nylon gizmo wears down and does not fully translate the lever movement to the switch. I noticed it ‘torqued’ a bit as I moved the blinker lever. In the image below, you can see that I had originally added a few shims made from a soda can. That particular fix didn’t work.

Datsun 240Z Blinker Repair - WoodWorkerB
The Nylon Gizmo.
Click for larger image.
Datsun 240Z Blinker rebuild - WoodWokerB
As-Is” drawing of the Nylon Gizmo.
Click for full-size PDF.

I carefully measured my ‘as is’ nylon gizmo and transferred the design to my 3D printer. My printer prints a few thousandths oversize, so I figured this was a good starting point.

Nylon Gizmo (top) and 3D printed version (bottom), side view
Nylon Gizmo (top) and 3D printed version (bottom), top view

I printed with a carbon-fibre PLA and the slight ‘oversize’ of the print produced perfect results the first time.

An alternate fix courtesy of Tim F

I actually just solved my issue, maybe you want to add this information to your post:
The nylon thingy was in fact worn out, too. However, I only had to lengthen the spring which presses the little ball onto the seesaw. Additionally, I slightly bent up the two metal tabs on which the ball rolls. Therefore, even with less side-to-side movement of the nylon actuator, the seesaw gets fully engaged.

Related Links

Datsun 240Z Tail Light Refurbish
Datsun 240Z Blinker Switch Detail
240Z MultiFunction Switches