What distributor do I have?

[mulberryworks]

Several years ago I bought a rebuilt distributor off of eBay as the current one in my US version 1970 2800 CS has erratic spark timing. I've never installed the replacement in the engine.
Today I was getting the car prepped for its coming move to Austin and took out the purchased distributor with the intent of installing it. I realized it's not even close to the same as the installed unit being a later style with internal capacitor. It also has a cover I've never seen before over the contact points so I can't measure the gap or adjust it. I pulled up on the cover here and there, but didn't want to force it off and risk damaging it. Any hints? Or is it simply a matter of more force?

It's number is 0 231 305 070, I had no idea there are so many different models of Bosch distributors or I would have done more research before clicking 'buy now'.
The ad said it was for a carbureted M30 engine, so I thought I was good. I usually take such unsupported statements with some skepticism, but it was rebuilt, and was a good price.
My recently purchased Blue Books list a very different number for most of the early E9, 0 231 162 002,
and lists only one close to my rebuilt one for the 3.0Si, 0 231 305 059.

These numbers are so old I'm not able to find any documentation for them or the versions that supersede them.

Can anyone tell me if this is an acceptable distributor for a stock 2.8 liter M30 engine with dual Zenith carbs?

 

[Dlc]

Hi Ian,
I am using the Bosch Classic website to determine origin and usage of the distributors:

the search for your part gives this result:

Fahrzeug- und Produktsuche

Hier finden Sie eine Fahrzeug- und Produktsuche, mit deren Hilfe Sie nach Ersatzteilen und Informationen für Ihr klassisches Fahrzeug recherchieren können.

www.bosch-classic.com

So this tells us it is for the injected E3 M30.
I am sure we have experts here who can tell if this dizzy potentially also could be used on the 2800 CS.

good luck!
Dominik

 

[deQuincey]

never have seen the white plastic block that covers the points, i can not understand how it works

but i assume that if you place nromal points on that dizzy it will be able to ignite your cs

 

[mulberryworks]

The points installed do seem to be normal points, except with a cover. But I can't tell what the point gap is because of the cover. I suppose I can try to use an old dwell meter I have to see if they are set correctly but I'll have to figure out how to spin the shaft outside of the engine for testing.
The white cover has the number 14 on it. I wonder if that will show on a parts diagram somewhere. Since it seems to be for a 3.0 Si, that's a good place to start looking. That tab with the number would seem to be a good place to pull up to remove the cover. I'll investigate there some more.

 

[stphers]

Man, I haven't seen one of those covers in years They were put on to stop "point arc " If you use a flat blade screwdriver, it can be wedged off The difference is in the curve of the timing advance for the different dist This will actually work in your car but the advance might be off giving maybe not the same performance ( or maybe better depending on the advance )

Thanks, Rick