2240310 1972 BMW 3.0cs

Thanks for your comments guys!

@HB Chris, that was not what I wanted to hear, but it was the right call. I broke out the borescope this morning and carefully lined up the timing mark on the flywheel and confirmed that the timing gear was a tooth out. I pulled it apart and got it lined up properly this time and it is mostly back together.

As I was inspecting the 123 Ignition distributor I realized that there was some oil residue inside the cap, so I pulled the distributor apart and found a fair amount of engine oil has migrated through the shaft into the body of the distributor.

I have now cleaned the distributor but need to do a little more research to see how to better seal the shaft. I do have the spiral cut shaft and despite that, oil has made its way into the body. I recall that @Stevehose found the same thing and replaced the o-ring seal and may have added a second. I need to see if I can find any pictures of that work.

As to the tune, I was starting the car on my “just get it running” tune which is no advance at all. I do that to get the distributor timed at TDC, then upload the tune. With my Weber 38/38’s I was running centrifugal curve of 12 degrees from 500-1400 RPM, then 33 degrees through redline with a rev limiter in place.

I would like to hear what you and others are using with the Webers. I also have headers and a cam.

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I guess I am just lucky as I’ve never had any oil migrate up into the 123…….yet.

I know Steve did remove the spiral cut shaft and put the original shaft back in but did add a second o-ring.

Screenshot of the curve I’ve been using since 2020.
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I guess I am just lucky as I’ve never had any oil migrate up into the 123…….yet.

I know Steve did remove the spiral cut shaft and put the original shaft back in but did add a second o-ring.

Screenshot of the curve I’ve been using since 2020.
Thanks for sharing the screen shot. I just finished re-reading Steve’s write-up on the oil migration issue. I am going to re-assemble but I guess I will reach out to 123 to see about getting the non-spiral cut shaft and a new bushing.
 
When I broke a rocker arm on the NK and put in a new cam I was one tooth off and couldn’t get it to run smoothly. I undid the gear, turned cam with channel locks and then secured the gear.
 
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