1 - drain hole, in case of rear main leak and to let water out that enters from the front hole, where the timing ball is seen
2 - no - turn the engine over by hand until you see the timing mark in the small hole, passenger side [turns easy w/ plugs out]
3 - ?
4 - copper works

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics