Don't worry about it, I gave instructions to Richard privately and told him all about how to tell number one from number four. It wasn't till I was trying to explain it again that I realized my error. I guess I had never thought about it but that is one thing unique about five cylinder engines. They do not have a comparable piston up at the same time like 4, 6, and 8 cylinders do.
Bosch Master, ASE Master, L1
33 years MB technician