An M60A3 is an automatic as well. It won't bump start unless someone leaves it in gear. Yes, there is a TM procedure on how to pull start an M60.Just a side note and funny story. Some of my old unit went to Germany to help train some units in Armor and were issued M60a3 tanks as OPFOR. On manuvers one of the tanks tried to climb a nasty grade. It stalled and rolled backwards. The guys in the tank found out real quick that the intake spews into the crew compartment.
I also heard of M60s popping on thier own and crawling across the motor pool bumping and starting other friends along the way. Hillarity ensues.
Not a case of piston engined tanks doing this, but we had M1s firing up on occasion in our motor pool in the Cav. They are autos so they don't take a jog, just run till someone notices.