Oil Pump

[6.5 Detroit Diesel]

We finally got the truck all back together today and fired it up. The oil light stays on and it sounds like a lifter isn't getting enough oil? The oil pump was removed, but I made sure that it was clean before it went back in. Anything that could have been missed?

[Duramaster]

Did you remember to install the oil pump drive shaft? How about the teeth on the oil pump drive itself?

[6.5 Detroit Diesel]

Yes, I did put the pump drive shaft in, with the indent towards the top. Was there something different that had to be done?