I am lucky to have the original date coded Yazaki plug and coil leads on my 1970 240Z. So I've started this topic to discuss the details of these on S30 cars, I don't want to limit this to only early cars, as I'm interested in hearing about their evolution over the years.

Edit, 6AUG2021,  Replaced image and pdf drawing to reflect correct part numbers

I have taken detailed measurements to create 3D cad models and a drawing complete with markings. To start here are a few pictures of mine, they are not pristine but the date code and markings can be seen.

 

Here are a few images of the 3D cad model, created with Solid Edge version 2020:

The descriptions and part numbers are from the 1973 JDM S30 Nissan parts microfiche. Interestingly the lengths quoted in the parts book are close but not exactly the same as my examples.

The small triangle ahead of Yazaki, is actually their corporate symbol, I did my best to represent it as close to the original as I could. The text font I used was the closet I could find on my cad program, again close but not exact.

https://www.yazaki-group.com/75th_en/history/mark/

 

I'm also attaching a drawing of these in pdf format. @Mike, I hope you don't mind that I poached the club logo and used it.  Any comments are welcome and appreciated.

Here's a preview of sheet 1 of the drawing:

 

 

22450-E4125(A) Yazaki Ignition Lead Set 1970 240Z.pdf

Edited August 6, 20213 yr by CanTechZ
Added preview of the pdf drawing

This is terrific. Thank you for doing this.

Do you have the original coil for the car?

Stellar job Mike, incredible attention to detail. Perfect basis to recreate the plug wires over the winter.

Roo

12 minutes ago, hiyabrad said:

This is terrific. Thank you for doing this.

Do you have the original coil for the car?

Thanks, and yes I do. It's currently buried with other parts but here is a picture before I removed it.

14 minutes ago, CanTechZ said:

Thanks, and yes I do. It's currently buried with other parts but here is a picture before I removed it.

I'd really like to get a high quality photo or scan of the printing on the coil as I am looking to reproduce the coil with correct printing. The coil wraps I have seen do not use the correct font, symbols, etc.

1 hour ago, hiyabrad said:

I'd really like to get a high quality photo or scan of the printing on the coil as I am looking to reproduce the coil with correct printing. The coil wraps I have seen do not use the correct font, symbols, etc.

Pulled mine out and tired to get a good picture, but the condition is not so good. Here is the best I could do,

There is 1971 240Z survivor currently on BAT that has original leads.

https://bringatrailer.com/listing/1971-datsun-240z-128-2/

Looks like in 1971 the color of the markings was changed to white and the resistor symbol markings changed. Also on the #6 lead the plug boot was changed to angled. Here are a few zoomed cropped images.

While looking for something unrelated I found this Nissan Technical Service Bulletin that describes when and why the markings were changed on the plug and coil leads.

Edit, Aug 6.  I just noticed that "New" and "Former" are indicated wrong in the TSB. Yellow should be former and white should be new. In checking the register on @Carl Beck's site Zhome the engine number listed for the start of this change would have been in 3/71. The publish date of this TSB is December 1971 so it looks like 1972 models would have the white labeled Yazaki leads.

Edited August 6, 20213 yr by CanTechZ

On 5/24/2021 at 1:10 PM, SpeedRoo said:

Stellar job Mike, incredible attention to detail. Perfect basis to recreate the plug wires over the winter.

Roo

Roo, What are the chances you might make a few sets for sale? Thanks

2 hours ago, hiyabrad said:

Roo, What are the chances you might make a few sets for sale? Thanks

+1 or +2

If they turn out correctly would be happy to do some for others.

31 minutes ago, SpeedRoo said:

If they turn out correctly would be happy to do some for others.

Agreed, they need to be correct. Please put me in line for a 69 and a 70.