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Bob and other's

In a perfect world, yes. Or when they were new. I've not ever checked a new one. As I recall, theoretically, you could have a cranking timing of near 0 degrees, and a wide open advanced timing of 25 BTDC. I've never been able to get that range out of these old distributors. The static timing of using the TDC mark, and turning the distributor against the rotation of the shaft until the points just start to break open is an excellent starting point. I make sure the advance is free to work, and set running timing to the advance (25 degree). Then change engine speed and make sure the advance is working. I think maybe once, I was able to get back to the TDC mark at a slow idle. But whatever the non-advanced timing gets back to, as long as the advance is working, is good and safe enough for cranking and starting.
 
Also, be aware that when dealing with a distributor, advance may be spec'ed in "distributor degrees" or "crankshaft degrees"

Since the crankshaft turns twice as fast as the distributor cam, as an example, 12.5? of DISTRIBUTOR advance = 25? of advance at the crankshaft, where spark advance is commonly measured.

So a small change in advance mechanism travel makes double the degree difference at the crankshaft.
 
I'm also not Bob. Here's my 2 cents worth.

All old tractors have low compression, and run at low RPM but high mani pressure. You can set the advance as high as you want, and I seriously doubt it will ever detonate with modern fuel. As long as the tractor will start, set the advance as far as possible for good power. If you do get a ping, or detonation event, back it off a few(so unlikely).
 
It's a Delco dist on a Super M Farmall, i put some White Out,typing fluid, on the crankshaft, pulley, mark, but it's so dark in there it's very hard to see, even with the timing lite, so a little desperate to get it right,but it doesn't ping and starts good so close enough i guess! Thanks everybody . I need some thing white and reflective,that would help.
 
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