Where is the number one cylinder on a mercury v6?

I'm not familiar with the engine, but located the distributor and find the face which has numbers ranging from 1 to 6. Locate "1" and have a look at which cylinder it leads to. That said, It's probably the front left cylinder.

=========================================================

You don't say which model of Mercury Vehicle , but :

front wheel drive is :

firewall

1-----2-----3

4-----5-----6

front of vehicle > driver

--------------------------------------

rear wheel drive and 4x4

firewall

3 - 6

2 - 5

1 - 4

front of vehicle

( Helpfull )