Originally Posted by Lester

I was reading the Cummins manual for my `92 motorhome with a B59 in it. On this motor, Cummins has a TDC alignment pin which when you can push it in, you get TDC on Piston 1. Pretty neat! Just mark and rotate the index pulley around each time to get TDC on the other pistons.

Just don't forget to pull out the alignment pin before your crank your motor!