66 Fastback
Famous Member
Yes, the distributor vacuum cannister should hold a vacuum. Using the vacuum pump, and distributor cap off, you can start pumping and watch to see the vac level at which the mechanism starts moving. Keep increasing the vac and note at what vac reading it stops.
You can do the same thing with the engine running and a timing light. Increase the vac and note when the timing begins to advance. Continue in small increments until the timing does not advance any more.
It is expecially helpful if you have a dial back timing light or you have a series of timing scale marked on your balancer.
Sorry I can't comment on the 1940 carb.
Doug
You can do the same thing with the engine running and a timing light. Increase the vac and note when the timing begins to advance. Continue in small increments until the timing does not advance any more.
It is expecially helpful if you have a dial back timing light or you have a series of timing scale marked on your balancer.
Sorry I can't comment on the 1940 carb.
Doug