After checking my A12 for vacuum leaks I have discovered that my Vacuum Advance Assembly has a leak on my Mitsubishi Distributor.

Below is a photo of my broken unit.
http://www.datsun1000.com/UserImages/beetwenty/Large/IMG_0132.JPG

My question is does anyone know if the same part is interchangable with the L18 unit?
Other than fitment my concerns are weather it has the correct rate of movement and total distance of movement?

Here is a link to one on ebay for reference.
http://www.ebay.com.au/itm/SINGLE-VACUUM-ADVANCE-UNIT-NISSAN-DATSUN-180B-L18-EARLY-1-8L-BRAND-NEW-/221233563908

They look the same. If they are both T3T distributors they should interchange.

Or just plug the line. The A12 will run OK with no vacuum advance. It only had an effect at part throttle anyways.

Thank you for taking the time to answer my questions lately ddgonzal.
You are a big help to many Datsun owners.

Cheers, Ash.

Time for an update on My Vacuum advance.

I received my part today, and have compared the two parts.















The Diaphragm diameter, travel of actuating rod and spring rate matches between these two units.
...But the length of the L16 actuating rod is 2.5mm longer than the A12 actuating rod.

The L16 Vacuum Advance Assembly Bolts up to the A12 Distributor. Horay!

I am guessing the longer Actuating rod will result in a difference of about 5 Deg to my inital advance from where I previously had it set.

I doubt this will limit the mechanical advance from finishing it's travel, but am not 100% sure.

If it interferes, then I will see about a 2.5mm spacer between the Distributor and Vacuum advance Assembly, and elongate the two mounting holes another 2.5mm.

I am still waiting on a new throttle chamber for my Hitachi Carb, so will not be able to test the distributor for atleast another week or so.

(I compared spring rates by clamping the units together and squeezing them through their travel, both bottomed out at the same time.)

Looks like it will work! Which distributor is it for? TVA/TVG or T3T?

T3T035-83-4X04
22100-G2770