[Healeys] Diesel BJ8

[Bob Spidell]

No, I haven't stuffed a Cummins 6-cyl in my BJ8.  But, my car has 
started dieseling--aka 'running on'--more than it used to. Compression 
is high-180PSI give-or-take on all 6--but mixture is good (I think) and 
idle is usually around 700-750RPM depending on conditions.  Timing is 
spec (15deg BTDC at 600RPM, vacuum advance disconnected and port on carb 
plugged).   I've always run Champion RN12YC plugs, and have never had a 
problem with them, but I'm wondering if colder plugs might help.

Thoughts?

Bob