We are dealing here with a 1971 280se 108018 6 cylinder automatic - I am confused about how the vacuum changeover swith is supposed to work with the vacuum advance. I replaced all my vacuum lines and while reading in the manual how the switch works, I decided to connect vacuum directly to the distributor advance thinking the distributor would be advance all the time, not just above 2400 RPM. After doing this, I seem to have read somewhere on this forum that connected in this manner, the distributor would be retarded all the time. Can someone set me straight on this and do I just need to reconnect the switch as MB intended and wait until 2400 RPM to advanced ignition?
Thanks
Jerry

__________________
Jerry -
If you don't learn something new every day, you aren't paying attention!!
1971 108 280SE 2.8 "Ronnie"
1985 300TDT (76,904 Original miles ) "Sadie" (Sold-went back to Arkansas)
1984 300DT "Green-go" (Sold)
1984 300DT "Silver Bullet" (Sold)
1956 220S Ponton
1985 300D (Sold)
1984 300D

Unless you have two vacuum ports on the distributor vacuum canister, it is a vacuum retard, not vacuum advance. The changeover switch is what controls this. I just plug the vac. hose at the distributor so it looks stock, but does not retard the timing.

MBBuff,
Thanks for the info, I now know what to do re the distributor.
Thanks
Jerry

__________________
Jerry -
If you don't learn something new every day, you aren't paying attention!!
1971 108 280SE 2.8 "Ronnie"
1985 300TDT (76,904 Original miles ) "Sadie" (Sold-went back to Arkansas)
1984 300DT "Green-go" (Sold)
1984 300DT "Silver Bullet" (Sold)
1956 220S Ponton
1985 300D (Sold)
1984 300D